House Extension or Home Renovation? Preparing a London Project Brief
Updated: Oct 8
If your London home no longer works for everyday life, the first question is what needs to improve. You may want a larger kitchen, another living space, better connections between rooms or a refreshed interior. A house extension adds space; a renovation changes how existing space works. Some projects combine both.
THRC Construction — The Home Refurbishment Company — provides house extensions, home refurbishment and loft conversions across Greater London. Before choosing the form of your project, prepare a brief that explains the result you want to achieve.
Describe the problem before selecting the solution
List the things that make the current home difficult to use. Is the kitchen too small for cooking and dining? Do you need a separate space for work? Are storage and circulation the main concerns? Explain who uses each area and which activities need to fit comfortably.
Then write down your priorities in order. More floor space, more daylight and a different layout are separate goals. Keeping them visible gives the design and construction team a better basis for discussing options.
Consider what the existing space could do
Before assuming that every improvement requires an extension, identify rooms that are underused and spaces that could work differently. A refurbishment might address finishes and fittings, while a more substantial renovation may involve changes to the layout. Any structural changes need an appropriate assessment before the work is priced and agreed.
Explain the features you value and want to retain. Photographs and an existing floor plan help show the relationship between rooms. If you already have proposals, send them and say which parts are fixed and which are still being explored.
Define the extension and the work around it
For an extension enquiry, describe the additional space you want and how it should connect to the current house. Include the property postcode, photographs of the relevant exterior and interior areas, and drawings if available. Tell the builder whether the project also includes an existing kitchen, bathroom or wider house refurbishment.
An extension quotation needs a clear boundary between the new construction and work to the existing home. Ask how connections, retained finishes, services and making good are covered. Confirm which design information and checks remain outstanding before a final scope can be agreed.
Prepare for access and day-to-day life
Share what you know about side access, parking, deliveries and available storage. Tell the team whether you expect to stay in the property during the work and which rooms must remain usable. Discuss how the proposed sequence could affect access to cooking, washing and living areas.
Explain your preferred starting period and any dates that matter to you. Ask for the programme to be discussed alongside the scope, rather than assuming every project can follow the same timetable.
Use the same brief when comparing quotations
Send the same drawings, priorities and finish information to each builder. Ask what is included, what is excluded, which assumptions affect the price and how changes will be agreed. Clarify responsibility for materials you intend to purchase yourself, along with payment stages and handover arrangements.
A useful quotation conversation connects the work to your goals. It should help you understand whether you are pricing an extension alone, a home renovation, or a combined design and build project.
Rear, side and wraparound ideas: what your brief should still cover
Homeowners often ask about rear, side or wraparound extensions. Treat these as questions for the brief rather than a fixed design choice. Note how new space should connect to the kitchen or garden, where daylight matters most, and which walls or openings you hope to retain. Planning and structural requirements depend on the property, so do not assume a particular form is suitable until it has been properly assessed. If you are considering space at the back of the house, our rear extension project brief sets out the layout, garden access and quotation questions to prepare.
West London and Hammersmith homes: access and neighbouring context
In West London and Hammersmith — and on many similar streets across Greater London — tight side returns, party walls and garden-only delivery routes can shape how a project is organised. Include photographs of exterior elevations, neighbouring boundaries and the access route for materials. Mention parking limits or shared pathways if you know them.
These notes help a builder understand the site. THRC provides house extensions and home renovation across Greater London; borough names here are examples of access context, not a limited service area.
When is a home renovation enough without an extension?
Sometimes layout, daylight and storage goals can be met within the existing footprint. Revisit what underused rooms could do before deciding that every improvement needs more floor space. If the conversation turns to finishes and room-by-room scope for a quotation, use the home refurbishment quote checklist.
Can I combine a house extension with a kitchen or whole-house refurbishment?
Yes — treat that as a briefing question. Mark clearly which work is the extension and which is work to the existing home, including a kitchen or wider refurbishment. Separate boundaries make quotations easier to compare. For finish and room-list detail on the existing house, see the home refurbishment quote checklist.
What if I am also considering a loft conversion?
List both options and your priorities so the conversation stays goal-led rather than solution-first. A loft conversion brief covers room use, staircase and rooms below — see the loft conversion London project brief.
Related reading
Discuss your house extension or renovation brief
House extensions and home renovation across Greater London — including West London and Hammersmith.
Share your postcode, photographs of the relevant interior and exterior, drawings if you have them, and the space or layout result you need. THRC can arrange a site visit where it helps, or talk through your brief ahead of a quote.
Start here: contact THRC.
Email: sales@thehomerefurbishmentcompany.co.uk
Phone: +44 (0)20 3633 8086
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