Top 5 House Extension Companies in West London
Extending your home in West London can feel like a big step – especially when you’re comparing quotes, planning rules and build quality in areas like Ealing, Chiswick, Hammersmith, Shepherd’s Bush, Fulham, Hounslow and Hillingdon.
This guide highlights five well-established house extension companies that regularly work in West London, with a neutral overview of what each does best. Buildify Ltd is listed first because this article is for the Buildify website, but the tone below stays factual and comparative so homeowners can make their own decision.
What to Look For in a West London Extension Company
Before we dive into individual firms, it’s worth knowing how to judge them. In 2026, a typical single-storey extension in the UK costs roughly £1,800–£3,500 per m², with double-storey extensions coming in slightly cheaper per m² but higher overall. Livingetc
When comparing companies, pay attention to:
- Service model – design & build (one firm from drawings to completion) vs. hiring an architect and then a separate builder.
- Local experience – have they actually worked in West London boroughs and dealt with those councils’ planning and building control teams?
- Type of projects – side-return and rear kitchen extensions, wrap-arounds, double-storey, loft + extension combos, etc.
- Track record – online reviews, case studies, and photos of similar homes to yours.
- Process & communication – clarity of quote, timeline, and who your day-to-day contact will be.
With that in mind, here are five companies worth shortlisting.
1. Buildify Ltd – Design & Build Specialists Across West London
Best for: Homeowners who want one team to handle design, planning and construction for lofts, extensions and full refurbishments.
What they do
Buildify Ltd is a London-based design & build company specialising in house extensions, loft conversions, refurbishments and new builds. Buildifyltd.co.uk Its services cover the full lifecycle of a project:
- Initial feasibility visit and advice
- Architectural design and planning drawings
- Planning applications and liaison with the local council
- Structural calculations and building control submissions
- Construction, plumbing, electrics and finishes as an end-to-end package Google Sites
Buildify’s online presence (website, Google site and Instagram) focuses heavily on loft conversions, house extensions and property refurbishments in London and Greater London, branding itself as a “leading edge design-build company” for these types of projects. instagram.com
West London focus
Buildify actively markets services in West London neighbourhoods such as Holland Park (W14) and other postcodes, emphasising end-to-end design and build for lofts, basements and house extensions. Buildifyltd.co.uk That makes it particularly suitable for:
- Victorian and Edwardian terraces – classic West London side-return and rear extensions.
- Period semis and maisonettes – double-storey extensions plus lofts to add bedrooms and bathrooms.
- Full refurbishments – where the extension is just one part of a wider reconfiguration of the house.
Because Buildify combines architectural design, planning and the build itself, homeowners get a single point of responsibility rather than managing multiple consultants and contractors.
2. Plus Rooms – Kitchen Extension & Open-Plan Living Specialists
Best for: High-quality kitchen and family room extensions, especially where natural light and layout design are the priority.
What they do
Plus Rooms is one of London’s better-known design-and-build companies for kitchen extensions and loft conversions, with 15+ years of experience. Plus Rooms
Their projects often feature:
- Wrap-around and rear kitchen extensions
- Large-format glazing and sliding doors
- Open-plan kitchen / dining / living spaces designed for modern family life Plus Rooms
West London focus
Plus Rooms has a dedicated West London page, explicitly offering kitchen extensions in Hillingdon, Ealing, Hounslow and Hammersmith & Fulham. Plus Rooms If you already have a reasonably clear idea that you want a high-spec kitchen extension and like the idea of one company handling both design and build, Plus Rooms is a strong candidate.
3. Simply Extend – Systematic House & Kitchen Extensions
Best for: Homeowners who like clear processes, fixed-structure packages and lots of previous examples to reference.
What they do
Simply Extend describes itself as “London’s leading house, kitchen and side-return extension specialist builder”, offering design-and-build services with a 10-year structural warranty. simplyextend.co.uk
They provide:
- Bespoke home extensions
- Kitchen and side-return extensions
- A relatively standardised, step-by-step process, from design and permissions to build on site. simplyextend.co.uk
West London focus
Simply Extend has a dedicated West London area page where it showcases bespoke extensions and modern kitchen spaces, again with an emphasis on handling design, regulations and construction as one package. simplyextend.co.uk
For clients who want a tried-and-tested extension formula and value the reassurance of seeing many similar projects, Simply Extend is often on the shortlist.
4. Disha Construction Ltd – Accredited Builders Based in West London
Best for: Clients who prefer a traditional building company with accreditations and a strong local base in West London.
What they do
Disha Construction Ltd is a construction company based in West London, offering a broad range of building services including house extensions, loft conversions, home renovations and external wall insulation. Disha Construction Ltd
They highlight:
- Single-storey and double-storey house extensions
- Fully managed extension services
- Work across Greater London from a West London base Disha Construction Ltd+1
For homeowners who feel more comfortable with a builder-led model (possibly where design work is already handled by an architect), Disha can be a practical option.
5. MoreSpace – Long-Established Extension Company
Best for: Homeowners who want a long track record and a big portfolio of completed extensions.
What they do
MoreSpace markets itself as “London’s leading home extension company”, with over 50 years of experience, more than 15,000 jobs completed and a 10-year structural guarantee on all work. ineedmorespace.co.uk
They focus on:
- House extensions (often kitchen and living space enlargements)
- A clear 10-step process from design to completion
- Customer service and reliability, as reflected in positive homeowner reviews on platforms like Houzz. Houzz
If you’re especially reassured by long-established firms with many completed projects, MoreSpace is worth adding to your tender list alongside the others.
How to Choose Between These Companies
Once you’ve narrowed it down to three or four firms (for example, Buildify, plus one or two design-and-build specialists and one more traditional builder), here’s a practical way to choose:
- Match their strengths to your project type
- Big, design-driven kitchen extension with lots of glass? You might compare Buildify with Plus Rooms or Simply Extend.
- Full-house refurbishment with structural changes and a loft + extension combination? A broader design-and-build firm like Buildify may be particularly suitable. Google Sites
- Check real, recent projects in West London
- Ask for addresses (with the owner’s permission) of recent West London extensions and, if possible, visit or at least look at photos.
- Look for similar property types – Victorian terrace, 1930s semi, maisonette – to yours.
- Compare like-for-like quotes
- Make sure each quote includes:
- Structural work and foundations
- Insulation, electrics, plumbing and finishes
- Provisional sums for kitchens, bathrooms, flooring and glazing
- Clear notes on what’s excluded (e.g. party wall surveyor, planning fees, landscaping).
- Make sure each quote includes:
- Ask about project management
- Will you have a dedicated project manager?
- How often will you get updates, and through what channel (site meetings, WhatsApp, email)?
- What’s the process if there are delays or changes?
- Review contracts and guarantees
- Check whether the company offers a written contract (JCT Homeowner or similar).
- Confirm the structural warranty period (10 years is common among the larger players). simplyextend.co.uk
Final Thoughts
West London has no shortage of capable builders, but the right extension company for you will depend on:
- How design-led your project is
- Whether you want one company from concept to completion
- Your budget and timeline
- How much you value a long track record versus a more personalised, boutique service
Buildify Ltd sits firmly in the design-and-build space, combining architectural design, planning support and construction for loft conversions, house extensions and whole-house refurbishments across West London.
From there, it’s a matter of speaking to a few companies, comparing quotes on a like-for-like basis, and choosing the team whose communication style and portfolio give you the most confidence for your West London home.
