Terrace House Extension

Terrace House Extension

Terrace House Extension

Terrace House Extension About us

Scenario is a dynamic London-based practice specialising in residential architecture in and around the capital. We produce thoughtful, original, sustainable designs that juxtapose heritage and contemporary details and evolve to suit changing lifestyles. Our highly collaborative team uses leading-edge design technology to boost efficiency and drive down costs from concept through completion.

Terrace House Extension Your Terrace House Extension project

Remodelling a period property requires vision, skill and a profound knowledge of the local area. Our architects adapt and extend terrace houses across London and the southeast, reconciling historical details with modern, innovative elements. We cultivate relationships with planners, regulators and tradespeople across the UK to make every project run smoothly.


To discover whether or not your architect has had success steering planning applications through your local council, visit the “planning applications” page of your local council’s website and enter the architect’s name in the search criteria.

Terrace House Extension

Terrace House Extension

Scenario is an established architecture practice focusing on contemporary residential design. We take on projects of every scale and scope, from home refurbishment, renovation and expansions to new-builds.

Terrace House Extension Working with Scenario Architecture

Scenario is a small RIBA-chartered practice complying with the health and safety criteria of the Royal Institute of British Architects.

Our architects are fluent in cutting-edge 3D visualisation technology for designing floor plans, choosing finishes and fittings and simulating natural light. Our building information modelling technology (BIM) produces reliable construction information, rendering accurate data on all our models. This saves our clients time and money.

Terrace House Extension

Terrace House Extension In our client's words

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Terrace House Extension Further Reading

The ingenuity of London architects throughout the ages means we get a phenomenal array of building on our streetscapes. But there is one constant across the country – certainly across London. And that is the terrace house. Massive expansion in the late 18th century to the early 20th century means long residential streets chock-a-block with terraced housing appeared month to month. They were adorned in any number of ways, with friezes and spires, bow, bay and leaded-glass windows, lacy gables and columns. But the interiors were strikingly similar. The layout of a terrace house in Chiswick, West London, is scarcely different from one in Stratford.

This means architects have perfected many approaches to revitalising, renovating and expanding the terrace house. As our lifestyles change over time, solutions for upgrading bathrooms, maximising natural light, opening up communal areas and improving flow get more efficient and more sophisticated. Here are a few ways we can turn a standard Victorian terrace house into a dream home of epic proportions.

• Convert the loft
Most terraces houses have storage space in the eaves with potential for a bedroom or two and small shower room. Depending on your budget, you can extend your staircase into the second floor, push up the roof at the rear and get creative with the space. Some couples install an open bath in the boudoir space, replace walls with glazing and build custom storage beneath the rooflights.

• Extend into the side return
Victorian gardens tend to cut into the house at the side, creating an impractical void. Pushing the kitchen into this void can recoup some valuable space and open up opportunity for wow-factor design. Kitchen islands can move into the space, along with expandable tables, living spaces, utility rooms and alcove gardens. Advancements in steel-framed glazing allow us to fully open up the rear of a home with bi-fold, concertina or sliding glass doors and retractable ceilings. In warm weather, all distinctions between indoors and out evaporate.

• Open the common rooms
With an interior pillar or steel ceiling beam, you could completely eliminate the long interior wall separating the hallway from the living spaces. Removing that wall even partially lets natural light travel from the front to rear and back, livening up a dim lounge or kitchen.

• Up your bedroom count
If you’ve already pushed up the loft and pushed out the kitchen, you could squeeze in an extra bedroom on the second-floor landing over the expanded kitchen. An extra volume half-way to the new loft can accommodate a single room, nursery or dressing room to support the larger master bedroom. Having the flexibility of an extra bedroom means you can expand a poky bathroom into one of the existing rooms or create a new bathroom altogether.

• Dig down
Most Georgian, Victorian and Edwardian terrace houses have a cellar beneath the kitchen – really just a coal hole to heat the house from below. If you don’t have enough height in the space, you could excavate, at a cost. You’ll also have to underpin your foundations, add climate control and tank the basement against damp. If you’re in desperate need of storage, or a small room for guests, this will make sense.

Terrace House Extension Frequently Asked Questions

    There is no doubt that choosing an architect is a big decision and there’s a huge amount of information to consider. As you may have already experienced, different firms and architectural practices across London tend to differ in terms of the language they use, which aspects they emphasise and in their fees and scope structures. We have compiled an essential guide to choosing an architect, which includes the three most important considerations to have on your list whilst you come to a decision. This guide is based on our fifteen years of experience as a top architectural practice in London and includes our expert recommendations to ensure you make the right choice and select the architect that is best suited to you and your project. Click here to read the full guide.

    Terrace House Extension

    FAQHow should I decide which architect to work with?
    • As a dynamic practice operating in London’s premium residential market, managing projects remotely and conducting virtual meetings was a very familiar territory for us, long before the pandemic began and ‘working remotely’ became the norm.
    • Our clients have very busy lifestyles and may move between several different locations, both within the UK and beyond, during the lifecycle of a typical project.
    • To accommodate such client needs and enable us to run their projects smoothly we had all the technology and know-how associated with remote working in place for several years.
    • Read our full (Virtual) Process

    Terrace House Extension

    FAQCan I start a project during a global pandemic?
    The scenario design process was developed, tested and perfected through over a decade of extensive delivery of residential projects within and around London, some of its key features are listed below:   
    • Scenario based design – We start each and every project with a meticulous analysis of our client’s vision, requirements and aspirations. We do this by asking our clients to imagine their everyday scenarios living in the completed house and describe their desired interaction with it. 
    We then translate the resulting high definition brief into an informative and revealing 3-dimensional simulation, illuminating aspirations, requirements and patterns of habitation. 
    • Uniquely interactive - Our client’s deep involvement in the process does not stop with completion of the brief. Our design meetings are highly interactive, informal and fun. 
    Sitting together in front of a real time 3D model of the proposed design with realistic materials, lighting and textures we push and pull the proposed scheme together to explore its full potential and drag and drop different materials to explore various options. hen we invite our clients to take a virtual reality tour through advanced equipment that is always available in our practice for our clients to explore their projects at different stages of development. 
    • Designed to reflect you – Based purely on your lifestyle, aspirations and requirements and free from externally imposed concepts, metaphors and pre-conceptions, a completely fresh and unique design will gradually emerge and it will tell your story not ours. 
    It will not look like an image cut out of a trendy architecture magazine and not designed to intentionally impress anyone. It will feel familiar, warm and inviting and you will recognise yourself in it because it will be a genuine expression of the unique way in which you and your family wish to interact with it and enjoy it for many years to come.

    Terrace House Extension

    FAQWhat is unique about the Scenario design process?
    Any architectural project comprises three main aspects, Creative design, Technical design and Project Management. A successful architectural project can only be achieved when all three aspects are properly performed and harmoniously integrated by an experienced professional. But can we really except a single person to specialise and shine in all three aspects and furthermore skilfully negotiate and balance the often contradictory challenges these aspects present? The basic assumption underlying the common structure of almost all other architectural practices today is that it is possible and this is precisely what is expected from the lone and often junior Architect that would typically be assigned to run your project start to finish. Scenario works in a completely different and new way, we believe in specialism and teamwork and therefore assign three experienced specialists for each and every project. A project team in Scenario is composed of a Project Director, a Designer and a Technical Designer, seamlessly collaborating to deliver results, which are noticeably superior to anything that a single person, skilful as they may be, could ever produce.

    Terrace House Extension

    FAQWho will be assigned to work on my project?
    A key aspect, absolutely necessary to ensure successful delivery of your project is appointing a suitable and competent professional team. If we work together on your project we would be appointed as your Architects and Lead Consultants and help you to assemble the rest of the professional team. Most projects in and around London will require at least four additional consultants, a Structural Engineer, a Quantity Surveyor for cost control, an Approved Inspector to ensure and certify compliance with building regulations and a Party Wall Surveyor if any work is to be done to a party wall or structure. For some projects, depending on scale, complexity and your specific aspirations it may be recommended/required to use the services of additional consultants. Including but not limited to: Planning, Heritage, Right of Light, Landscape Designer, Audio Visual and Building Services Engineer. When appropriate, we will discuss these options with you and obtain relevant quotes for all additional consultants for you to consider.

    Terrace House Extension

    FAQWhich additional consultants are required for my project?
    Planning in the U.K in general and in Greater London in particular is admittedly a tricky business. It is a complex maze of policies, standards and regulations that requires specialised and up to date knowledge and skills to navigate successfully.  Over the years we developed a strong approach and an effective methodology, allowing us to maintain an outstanding track record stretching over more than a decade. Successfully securing planning permission for our clients across Greater London and the Home Counties.  The key aspects of our approach to planning are listed below: 
    • Collaborative – We start the conversation with planners early and advise most of our clients to seek pre-planning advice prior to submission of a full planning application. Our experience shows that when properly consulted and liaised with, most planning case officers will be receptive to conduct a professional dialogue, increasing chances of successes. 
    • Strategic – We tailor a custom planning strategy for each project based on its circumstances such as planning history, local context and specific challenging elements. We sometimes split applications or introduce minor tweaks to the scheme during the consideration period in conversation with the officers to prevent one contentious element from jeopardising approval of the main scheme.
    • Professional – Our experience shows that the quality and clarity of the submission in terms of background research, planning history of the property and context, precedent and of course the arguments presented to support the case has a tremendous effect on success rate. 

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    FAQWhat is Scenario’s approach to planning?
    The standard consideration period for a residential project is eight weeks, this is the official time frame for your local council to carry out consultation with the neighbours and reach a decision.  We recommend allowing for a minimum of ten weeks from submission to decision as in practice the process always takes slightly longer for the following reasons: 
    • The decision period clock only starts ticking once the application is validated by the Council, This requires then to check that the forms are completed correctly and that the submission contains all the necessary drawings, statements and reports.
    Validation can take anything from a few days to couple of weeks when the council is very busy, which is most of the time…
    • Although required by law to provide a decision within the statutory eight weeks period, it is not uncommon for councils to miss the deadline of the consideration period, normally only by a few days, sometimes longer. 
    While there are some effective measures to apply pressure, which we do not hesitate to use when appropriate, it is generally beneficial for the project to bear with the council a little longer. 
    • In some cases the council may ask us as your agent for an extension of time, this may be requested due to internal reasons or as an acceptable result of a professional discussion that we are conducting with them about certain aspects of the application that they are not sure about.

    Terrace House Extension

    FAQHow long will it take to obtain planning permission for my project?
    Once we have an initial scheme designed for your project which you are happy to proceed with, we will advise whether we recommend obtaining pre-planning advice or proceeding directly to the submission of a full planning application. Most of our projects are submitted first to pre-planning when the following applies.
    • Our experience shows that planning officers respond better to projects when they feel consulted and collaborated with. We find that when we truly listen to their often helpful and valid feedback and treat them as consultants for the projects and not representative of an evil enforcing authority, they tend to collaborate well with us and demonstrate increased flexibility.
    • Although the council in theory have eight weeks to consider your application, in practice they are constantly overloaded. They will only look at your application in the last few days of the consideration period. If this is the first time that they come across a scheme that they were never consulted about, our chance to secure permission for you in a single attempt is significantly compromised.
    • The standard practice is for the council to consider the full planning application as submitted and then issue a yes or no decision. Case officers are not required or even encouraged to enter a discussion with us or accept resubmission of minor changes to the proposed scheme during the consideration period.
    In practice our established working relationships and long-standing experience working across Greater London and the Home Counties often enables us to have a meaningful discussion and even introduce minor tweaks to the submitted scheme within the consideration period and prevent the application from being rejected. The chances for this strategy to deliver the desired results increases significantly with projects which were submitted first for a pre-planning advice.

    Terrace House Extension

    FAQWhat is pre-planning and will it be required for my project?
    In the past, it was common practice for local authorities to impose sustainability standards on residential developments. However, the 2015 Deregulation Act removed the obligation on local authorities to require any standard at all, which means the only requirements having fallen back to those of the Building Regulations.  With no clear and improved targets to work towards, in collaboration with Envision (www.envisioneco.com), we have created optional Sustainability ‘Levels’ to offer our clients the chance to drastically improve the sustainability credentials of their home. These ‘Levels’ encompassing Bronze, Silver, Gold and Diamond, traverse a clear and applicable route from basic compliance with current Building Regulations all the way to the full and rigorous HQM (Home Quality Mark) certification within Level Diamond. As the packages become more elaborate in terms of sustainability, analysis and implemented measures, they provide increasing tangible benefits. Ranging from thermal and acoustic comfort and wellbeing, to reduced carbon foot print, savings on running costs and significant advantages through the planning process.  The more elaborate packages obviously entail higher cost in terms of professional fees as well as impact on the construction cost, although each sustainability ‘Level’ will endeavour to not overly burden the construction budget.

    Terrace House Extension

    FAQWhat is Scenario’s approach to sustainability?
    In a nutshell building control is the means by which Local Authorities enforce compliance with current Building Regulations.  In practice there are two main ways to go about obtaining the required advice and certification for your project, via your Local Council’s Building Control Department or via direct appointment of an Approved Inspector who is authorised to carry out the inspection and certification on behalf of any local authority.   The role of either the Council’s Building Control Officer or an Approved Inspector is to verify that your project meets all current Building Regulations. They will review and approve all the drawings, inspect the actual work carried out on site and once the project is completed, issue the final compliance certificate. Due to an open market, healthy competition between local councils and approved inspectors, the process and associated costs are almost identical. Having said that, our experience is that the private inspectors still feel and behave more as your appointed consultants and the council’s service still feels more like a statutory inspection and it is often slower and less responsive.  While it is always good to be informed and understand the process well, as your appointed architects we will take care of this aspect of the project for you and save you considering comparable quotes that we will obtain on your behalf and appointing the selected provider. You can leave this aspect of your project entirely with us.  Building control is required for almost all projects, and for all the projects we ever worked on as only minor renovation works may be exempt.

    Terrace House Extension

    FAQWhat is building control and is it required for my project?
    Currently we recommend allowing between £2,500 and £3,000 per square metre for side extensions, rear extensions or front extensions. For basement extensions, which are most expensive way to add space to your home, we recommend that you allow between £3,000 and £3,500 per square metre. When it comes to roof extensions, our experience shows that it is better to allow a lump sum of £40,000-£60,000 for loft conversions with dormer windows and between £80,000 and £120,000 for mansard roof extensions. These ranges are based on averages from numerous actual projects that we have completed in and around London since we established Scenario in 2007. We only use these rough costs per square metre during the early stages of design to maintain awareness of your target budget until a cost professional is appointed and more accurate methods of estimation are employed. The actual cost for your project will depend on many factors, including the complexity of the design, level of structural support required, and selection of fixtures, fittings material finishes. Using these rough ranges as a guide we will work together with you in an interactive process to optimise budget and scope and find the balance that works best for you. The estimated costs per square metre mentioned above are for the build costs only and exclude VAT and professional fees.

    Terrace House Extension

    FAQWhat is the cost of building an extension?
    Currently we recommend allowing between £2,500 and £3,000 per square metre for areas which will undergo an extensive renovation. We designate an area of the project as extensive renovation if the planned works includes substantial changes to layouts, significant structural works, re-plumbing, re-wiring and full redecoration. For areas of lighter internal renovation which do not require significant changes to layout or substantial structural works but do require full redecoration, re-plumbing and rewiring, we recommend allowing between £2,000 and £2,500 as an estimated cost per square metre, we designate these areas as requiring medium renovation. If there areas in your project which only call for a light renovation such as re-plastering, and painting, installing new floor finishes and light modifications of electrics and plumbing fittings, we will designate these as areas of light renovation and recommend that you allow £1,500-£2,000 per square metre or even as low as between £1,000-£1,500 if you only have light touches in mind. The real cost for your project will depend on several different variables including the complexity of the design, extent of structural works and level of fixtures, fittings and material finishes. These estimated costs per square metre are for the build cost excluding VAT and professional fees.

    Terrace House Extension

    FAQWhat is the cost of an internal refurbishment?
    If you are thinking about building a new house from scratch for which the term Self Build is often used, we currently recommend allowing between £2,500 and £3,500 per square metre for projects in and around London. This may sound like a very wide range initially, perhaps too wide to be useful? As soon as we can establish even a few of the basics of your requirements and aspirations for the project we can safely narrow it down and customise it to match your intentions. The key parameters that will help us to refine initial estimates are whether or not a basement is required to achieve your target floor area, the likely construction method and corresponding structural approach and of course your desired level of fixtures, fittings and material finishes. Another key parameter that we must consider right from the outset is the level of sustainability that we are aiming at, are you satisfied with the base line requirements as defined by current building regulations, or should we aim higher? Working together with sustainability experts we have created our own bespoke set of sustainability packages which allows you to place your sustainability target anywhere you wish. This can range from basic compliance to an extremely sustainable and energy efficient standard which comes with great savings on running costs, future proofing and wellbeing benefits such as improved air quality, thermal comfort, and considerate and healthier surface finishes.

    Terrace House Extension

    FAQWhat is the cost of building a new house?
    The fee structure that we will offer will depend on the type and scale of your project as well as the scope required from us. The vast majority of the projects we take on are what we call ‘full projects’, these are projects for which we will provide full Architectural services from inception to completion, covering the standard scope of services offered by most RIBA Chartered Architects and more. For these full projects our fees will be calculated on the basis of an agreed percentage of the final cost of the building works exclusive of VAT and professional fees. At any given time, we will calculate our fees based on the latest construction cost estimates available until the final cost of the building works has been ascertained. Our fees will be adjusted both forward and retrospectively to reflect any increase in budget and scope of the project, and forward only (due to work already completed) to reflect any decrease in budget/scope. During early stages, our fees will be calculated based on our in-house estimation tool and once available, on estimates by the appointed Quantity Surveyor, followed by actual prices of returned tenders and finally, the contract sum reflecting any changes during construction. Under unusual circumstances we may agree to take on projects only up to a certain stage, for example up to planning, and sometimes from a certain stage if we are taking over from another Architect. For these ‘partial scope projects’ we will normally put forward a simple fixed lump sum proposal.

    Terrace House Extension

    FAQWhat is the fee structure used by Scenario Architecture?

Terrace House Extension Renovating a Terraced House: How to Extend, Remodel and Update

Terraced houses are a common sight in the United Kingdom, and many people want to renovate them. Here is some excellent advice on extending, remodeling, and updating terraced houses that will help you turn your house into something new.

When renovating, you should:

  • Seek the proper consultation
  • Consider the cost
  • Consider the space you are renovating

How to Add Value to Your Property?

To add value to your home, you should do everything possible to increase its beauty. As buyers walk into your home, they should be awed. Remember, first impressions matter. So if they were from seeing a couple of houses before, ensure yours is what they keep reminiscing even as the day comes to an end. To do this, you should:

Decorate and decorate well. With some good decoration, your house can be the most beautiful one in the neighbourhood.

Focus on a few key features to create an eye-catching focal point that will mesmerise visitors. For example, if you have great flooring or unique windows, highlight them–but don’t overdo it, or visitors won’t know where to look.

What Are The Party Wall Laws For Terraced House Extensions?

As it is a terraced house, the party wall laws are different. It would be best if you didn’t build too close to your neighbour’s property line as this would be encroaching on their space, and they could take you to court over this. The good news, though, is that there should be no problem if you leave enough room for them next door- typically, this is six feet.

Of course, the best way to avoid any legal problems and complications when building or extending your property would be to speak with a qualified solicitor who can advise you on the legal stipulations. It’s always worth getting professional advice before making decisions that could affect you for years.

How to Add a Kitchen Diner Extension?

If you have a kitchen coming up against the wall of your property, it might be possible to add on and turn it into something much more helpful. This process would take some work as there are various constraints, including party walls, but with careful planning and sound advice from an architect or builder, this could create all sorts of extra space for your family to enjoy.

How to Create a Bigger Kitchen?

If you need extra space in your kitchen, it might be possible to add on an extension–or even remove flooring and walls from other parts of your home and put them into the room. It would help if you also considered whether you want a separate dining area or not, making designing a larger kitchen even more difficult.

How Much Does It Cost For A Terraced House Extension?

The price of an extension will vary, and it’s essential to consider the costs before you start work on your project. You need to know how long the whole process is likely to take, which materials you’ll be using (some are cheaper than others), and the cost of those materials.

How to Enlarge an Entrance Hallway?

One of the best ways to remodel an entrance hallway is by adding onto your stairs. If you’re happy to live with the space around them, it might be possible- however, this will affect how much room there is on each floor and make future extensions more difficult. It would be best to consider whether you need an elevator to make the building more accessible.

Whose Permission Will You Need?

You will need to get permission for any building or extension from the planning authorities. If you live in a terraced house, this is even more difficult as permitted development rights rules may not cover your project, and so you’ll have to apply for full planning consent before starting work.

How To Add A Downstairs Or Add A Basement?

It’s possible to add a downstairs extension or basement if you have enough space. The most important thing is that the ground slopes away from your house, so there won’t be any risk of flooding- so it pays to do some research in this area before getting started. Also, consider whether you want an open plan design, as this will make building a new house more manageable.

How to Create an Open-Plan Layout?

Step One: Decide the rooms you want to include in your project and their sizes. Remember, if there’s any significant difference between how long or wide they are, it might be tricky to get them all fitted into one space–so do your research.

Step Two: Draw an outline of your house on the ground or floor and then mark out where you want each room to go. You can use a drawing program on your computer if you prefer, but make sure it’s accurate before getting any building work done.

How to Move a Bathroom Upstairs?

It might be possible to move your bathroom upstairs if you have a downstairs extension. However, this will depend on the size of the room and what kind of access you will need, and it’ll also need planning permission before going any further.

Are You Adding More Bedrooms To A Terraced Building?

It’s possible to add more bedrooms if you have an upstairs extension- but this will depend on the size of your property and how much room there is already. You can also create a studio or office area by adding space onto the back garden, but keep in mind that it’ll be difficult for anyone to gain access without going through another room-so; it’s worth considering who will be using the space.

What Is The “Right To Light” Law?

The right to light law means that you cannot build anything on your property, which will prevent a neighbour from receiving natural daylight. If the window in question faces east, this is a problem as buildings get in the way of sunlight, and so there’s an obligation not to do anything that will obstruct or reduce access to light- at least without permission.

The main lesson from this blog post is that renovating a terraced house can be an expensive and time-consuming process. Therefore, if you consider getting started on your renovation project, the best thing to do would be to get in touch with one of the experts who will help you plan how much it should cost and what steps you need to take.