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Builders in Hammersmith: Loft Conversions, Extensions & Renovations
Looking for a builder in Hammersmith? Crest Projects designs and builds loft conversions, house extensions and renovations for Victorian terraces, riverside houses and mansion flats across W6, with over 20 years of experience.
- Over 20 years of experience
- Design, approvals and build under one team
- Written, itemised estimates
Who are the best builders in Hammersmith for loft conversions and extensions?
Crest Projects is a West London building company that carries out loft conversions, house extensions and full renovations for homeowners in Hammersmith W6. We manage design, Hammersmith and Fulham Council approvals, Party Wall notices and the build under one team, with over 20 years of experience. Call 020 8088 8281 to arrange a site visit and written estimate.
Updated October 2026
Our builder services in Hammersmith
Hammersmith's tight Victorian terraces and period flats make good design and clean site management essential. Choose the service closest to your project.
Loft conversions in Hammersmith
Dormer, hip-to-gable, mansard and rooflight loft conversions. Often the best way to gain a bedroom in a W6 terrace.
House extensions in Hammersmith
Rear, side-return and wraparound extensions. Rear and side-return extensions for narrow Hammersmith plots.
Full house renovations in Hammersmith
Whole-house refurbishment managed by one team. Full refurbishment of period houses and maisonettes.
Kitchen renovations in Hammersmith
Complete kitchen refits from structural opening-up to final fitting. Open up galley kitchens in Victorian homes.
Bathroom renovations in Hammersmith
Bathroom, en-suite and wet-room refurbishment done properly. Compact bathrooms and en-suites planned to the millimetre.
Loft conversion builders in Hammersmith
In Hammersmith, house prices make extra space in the roof one of the smartest investments an owner can make. A loft conversion typically adds a bedroom and bathroom without losing any garden, which matters on W6's compact plots. Our loft conversion builders in Hammersmith design the layout, handle structural calculations and approvals, and build to Building Regulations for stairs, fire safety and insulation. If your home is a converted flat or maisonette, we also help with freeholder consent.
Types of loft conversion in Hammersmith
In Hammersmith, rear dormers on Victorian terraces are the usual choice, with rooflight-only schemes popular for flats and listed buildings where roof shape cannot change. Mansards are rare and heavily scrutinised, particularly near the riverside and in Brook Green.
Rooflight (Velux) conversions
Roof windows added without changing the roof shape.
Rear dormer loft conversions
Full-height space at the back of the roof.
Hip-to-gable loft conversions
Straightens a sloping side roof for a larger room.
Mansard loft conversions
Steep-sided, flat-roofed. Needs planning permission.
Loft conversions by property type
Terraced houses
Terraces around Brackenbury Village, Ravenscourt Park and Stamford Brook take rear dormers well. Because you share roof structure with neighbours, a Party Wall notice is normally needed.
Semi-detached houses
Hammersmith's larger Victorian and Edwardian semis can take hip-to-gable and rear dormer combinations, giving a full extra storey where roof geometry allows.
Detached houses
Detached and larger period houses are less common in W6, but where they exist, bigger dormers are possible, subject to conservation area rules.
Is your Hammersmith loft suitable for conversion?
- Houses or flats: a flat conversion needs the freeholder's consent and often a lease variation, so check ownership of the roof space first.
- Head height: around 2.2 metres from floor to ridge is the usual starting point.
- Roof structure: original cut timber roofs convert more easily than modern trussed roofs.
- Conservation area: roof changes visible from the street are controlled in Hammersmith's conservation areas.
House extension builders in Hammersmith
Many Hammersmith houses were built with small rear kitchens and narrow side passages. Rear and side-return extensions are the usual answer, creating a bright kitchen-diner that opens to the garden. Our house extension builders in Hammersmith design and build single-storey rear, side-return and wraparound extensions, taking care of foundations, steelwork, roofing and glazing.
Hammersmith's terraces are close together, so planning for access, noise and neighbours is as important as the design. We provide a clear programme, manage Party Wall notices and keep the street tidy throughout the build.
Home renovation and refurbishment in Hammersmith
W6 homes are often period houses or flats that have not been fully updated in decades. We carry out whole-house renovations and single-room refurbishments, including kitchens and bathrooms, coordinating plumbers, electricians, plasterers and joiners as one team.
- Full house renovation: strip-out, structural changes, services and finishes managed as one project. House renovation
- Kitchen renovation: layout changes, new services, fitting and finishing. Kitchen renovation
- Bathroom renovation: waterproofing, tiling, plumbing and fitting. Bathroom renovation
Why Hammersmith homes need an experienced local builder
Hammersmith mixes Victorian terraces around Brackenbury Village and Ravenscourt Park, red-brick mansion blocks near Baron's Court, Georgian houses along the riverside Upper Mall and a large number of flats and maisonettes. Each has its own structural quirks, from shallow Victorian foundations to shared roof voids in converted buildings.
The London Borough of Hammersmith and Fulham has 44 conservation areas covering about half of the borough, including Brook Green, Hammersmith Broadway, Hammersmith Town Hall and Westcroft Square. In those areas, changes visible from the street, especially roofs, windows and front boundaries, are controlled more tightly.
Some riverside streets near the Thames also sit in Environment Agency flood zones, which affects basement and ground-floor design. We check this early and design accordingly.
Many W6 streets are lined with houses that were later split into flats, so two neighbours on the same street can have very different rights. We start every project by confirming whether you own a house, a share of freehold or a leasehold flat, because it changes what can be built and who must agree.
Do you need planning permission to build in Hammersmith?
Many loft conversions and rear extensions on Hammersmith houses fall under permitted development, but flats and maisonettes do not have those rights, and conservation areas restrict them further. Use the table as a guide and confirm your address with the council.
| Project | Permitted development | Planning permission needed |
|---|---|---|
| Loft conversion (rear dormer) on a house | Often yes, within volume limits (40 m³ terraced, 50 m³ semi-detached or detached) | Yes, in conservation areas such as Brook Green, or if limits are exceeded |
| Loft conversion in a flat or maisonette | No, permitted development does not apply to flats | Yes, plus the freeholder's consent |
| Single-storey rear extension | Often yes, up to 3 m (terraced or semi) or 4 m (detached), or 6 m / 8 m through prior approval | Yes, if larger, in a conservation area, or if height and materials rules are exceeded |
| Basement or lower-ground works | No, excavation needs full planning permission | Yes, with structural and flood risk assessment |
General guidance only. Rules depend on your property, location and any Article 4 direction. We check this for you before design starts.
Which project suits your Hammersmith home?
Hammersmith's housing mix shapes the projects that work best. Use this as a starting point, and we will confirm after a site visit.
| Property type | Where you find it | Popular projects |
|---|---|---|
| Victorian terrace | Brackenbury Village, Ravenscourt Park, Stamford Brook | Rear dormer loft, side-return extension, full renovation |
| Mansion flat and maisonette | Baron's Court, Hammersmith Broadway, Brook Green | Internal renovation, kitchen and bathroom refits, loft with freeholder consent |
| Riverside Georgian house | Upper Mall and the riverside | Sensitive renovation, listed-building and flood-aware design |
| Edwardian semi-detached house | Stamford Brook, Brook Green fringe | Hip-to-gable loft, rear extension, kitchen refit |
Building in a Hammersmith conservation area
Hammersmith and Fulham Council has designated 44 conservation areas, covering about half the borough. Always check your address before ordering drawings.
- Brook Green, Hammersmith Broadway, Hammersmith Town Hall and Westcroft Square are among the designated areas, each with its own character profile.
- Roof alterations, front dormers and changes to front elevations normally need planning permission in a conservation area.
- Materials, window styles and brickwork are expected to match the original building.
- Listed buildings, including riverside houses, need Listed Building Consent for most external and internal changes.
We review your address against the council's conservation area maps before design starts, so you know early what is realistic.
What affects the cost of building work in Hammersmith?
No two Hammersmith projects cost the same. The main factors are:
- Project type: a rear dormer, a side-return extension and a whole-house renovation have very different scopes.
- Flats or houses: flat works involve freeholder approval, noise restrictions and shared structure.
- Approvals: planning, structural engineering, Party Wall surveyors and Building Control fees.
- Access: controlled parking zones around Hammersmith mean parking suspensions and skip licences.
- Finish level: glazing, kitchens, bathrooms and flooring often drive the budget.
Try our online cost calculator for a starting figure, or ask us for a written estimate.
How to choose a builder in Hammersmith
Searching for a builder in Hammersmith brings up directories, aggregators and many firms. Whoever you choose, check these points first:
- Flat experience: if you live in a flat or maisonette, ask how they handle freeholder consent, noise limits and shared access.
- Ask how they handle leasehold: converted flats are common in W6, so a builder should explain freeholder consent clearly.
- Check parking and skip planning: controlled parking zones mean permits and suspensions need arranging early.
- Ask about noise and hours: close neighbours and flats mean working hours and dust control matter.
- See finished terrace work: tight W6 plots need tidy, well-managed sites, so ask for recent examples.
- Insurance: ask to see public liability cover.
- Written estimate: an itemised scope, not a lump sum.
How a Hammersmith building project works with Crest Projects
Site visit and brief
We visit your Hammersmith home, listen to what you want, check access and parking around Brook Green or Brackenbury Village, and survey the existing structure.
Design and approvals
Drawings, structural calculations, a check against London Borough of Hammersmith and Fulham planning rules and conservation areas, Party Wall notices and Building Regulations.
Written estimate
An itemised estimate with scope, programme and payment stages.
Build
A dedicated team manages the works, keeps you updated and keeps neighbours in Ravenscourt Park informed.
Handover
Final inspection, snagging, certificates and Building Control sign-off.
Local builders across Hammersmith W6 and nearby
We work throughout Hammersmith W6, including:
- Brook Green
- Brackenbury Village
- Ravenscourt Park
- Baron's Court
- Hammersmith Broadway
- Stamford Brook
- Upper Mall riverside
- Shepherd's Bush border
Also building nearby
- Builders in Chiswick
- Builders in Fulham
- Builders in Kensington
- Builders in Ealing
- Builders in Richmond
- Builders in Putney
See our work on the projects page, read about Crest Projects, explore our property investment service or get a starting figure from the cost calculator.
Find Crest Projects near Hammersmith
Crest Projects Ltd128a Boston Rd, London W7 2HJ
020 8088 8281
info@crestprojects.co.uk
Our office is on Boston Road in Hanwell, West London. View our Google Business Profile to see our location, photos and reviews.
Builders in Hammersmith: frequently asked questions
How much does a builder in Hammersmith cost?
Cost depends on the type, size, structure and finish of the project. A loft conversion, a rear extension and a full renovation are priced very differently, and flats or period houses can add structural or access costs. Crest Projects gives a written, itemised estimate after a site visit. Our online cost calculator gives a starting figure.
Can I convert the loft in a Hammersmith flat?
Sometimes. Permitted development rights do not apply to flats, so you need planning permission, and you also need the freeholder's consent and often a lease variation. Whether it is possible depends on who owns the roof space and the structure. We can review your lease position and design options.
Do I need planning permission for a loft conversion in Hammersmith?
For a house, many loft conversions fall under permitted development, within volume limits. For flats and maisonettes, and in conservation areas such as Brook Green, planning permission is usually required. A lawful development certificate from the council confirms your position. We check this before design starts.
What is the best extension for a Victorian terrace in W6?
A side-return extension, often combined with a rear extension, is the most popular option because it widens the narrow kitchen and brings in light. A wraparound extension gives the most space. The best option depends on plot width, neighbours' extensions and the planning position for your street.
Are there flood risks when building near the Hammersmith riverside?
Some streets near the Thames sit in Environment Agency flood zones. This affects basements, ground-floor levels and extension design. Check the Environment Agency flood map for your address. We design with flood resilience in mind where it applies and talk through the options with you.
Do you handle party wall agreements in Hammersmith?
Yes. Most Hammersmith terraces share a wall, so loft conversions, side returns and deeper foundations usually need a Party Wall Act 1996 notice. We guide you through serving notices and agreeing a schedule of condition, so neighbours are informed properly and the project is not delayed.
Which Hammersmith areas do you cover?
We cover all of W6, including Brook Green, Brackenbury Village, Ravenscourt Park, Baron's Court, Hammersmith Broadway and Stamford Brook, plus neighbouring parts of West London such as Shepherd's Bush, Chiswick and Fulham.
Can I live at home during building work in Hammersmith?
Many Hammersmith clients stay at home during loft conversions and rear extensions. Kitchen renovations and whole-house refurbishments are more disruptive. We agree access, dust protection, working hours and temporary arrangements with you before work starts.
Do I need the freeholder's consent for building work in a Hammersmith flat?
Usually yes for structural work, roof space and external changes, and your lease may require consent even for internal alterations. Check your lease first. We can review the plans with your solicitor and help prepare the information a freeholder will want to see.
Can you work around Hammersmith's controlled parking zones?
Yes. We apply for parking suspensions and skip licences in advance, plan deliveries outside peak times and keep access clear for neighbours. On tight W6 streets this planning matters as much as the construction itself.
How do I get a quote from Crest Projects?
Call 020 8088 8281, email info@crestprojects.co.uk or use the enquiry form on our contact page. Tell us your Hammersmith address, the work you have in mind and your budget range. We then arrange a site visit, discuss options and send a written estimate.
Planning building work in Hammersmith?
Speak to a builder with over 20 years of experience. Tell us about your Hammersmith project and we will arrange a site visit and written estimate.
Crest Projects Ltd, 128a Boston Rd, London W7 2HJ