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Builders in Wimbledon: Loft Conversions, Extensions & Renovations
Looking for a builder in Wimbledon? Crest Projects designs and builds loft conversions, large rear extensions and whole-house renovations for the villas, terraces and garden-suburb homes of SW19, 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 Wimbledon 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 Wimbledon SW19. We manage design, Merton 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 Wimbledon
Wimbledon's large Victorian and Edwardian houses, garden suburb cottages and family terraces suit ambitious building work. Choose the service closest to your project.
Loft conversions in Wimbledon
Dormer, hip-to-gable, mansard and rooflight loft conversions. Large roofs on Wimbledon villas make generous loft rooms.
House extensions in Wimbledon
Rear, side-return and wraparound extensions. Big rear and wraparound extensions for deep SW19 gardens.
Full house renovations in Wimbledon
Whole-house refurbishment managed by one team. Whole-house renovations for large period homes.
Kitchen renovations in Wimbledon
Complete kitchen refits from structural opening-up to final fitting. Family kitchens that connect to the garden.
Bathroom renovations in Wimbledon
Bathroom, en-suite and wet-room refurbishment done properly. Master suites and family bathrooms to a high standard.
Loft conversion builders in Wimbledon
Wimbledon homes tend to be large, with deep roof spaces that make for generous loft conversions. A well-designed loft can add a master suite, a home office or two bedrooms. Our loft conversion builders in Wimbledon design the layout, handle structural calculations and approvals, and build to Building Regulations. Because parts of SW19 are conservation areas with Article 4 directions, we check the planning position before design starts.
Types of loft conversion in Wimbledon
In Wimbledon, large roofs make rear dormers and hip-to-gable schemes particularly effective, sometimes delivering two bedrooms in the roof of a villa. Rooflight-only conversions work on shallower lofts, and mansards are possible on some larger houses but face close conservation area scrutiny.
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
Edwardian terraces in Raynes Park, Wimbledon Chase and Southfields suit rear dormers. Party Wall notices are normally needed, and conservation area rules apply in some streets.
Semi-detached houses
The semi-detached houses of Wimbledon Park and Merton Park often suit a hip-to-gable and rear dormer combination, adding a full storey, subject to conservation area controls.
Detached houses
Wimbledon Village and Wimbledon Hill have many large detached villas with scope for big dormers and even two-bedroom loft suites, but heritage and tree controls often apply.
Is your Wimbledon loft suitable for conversion?
- Roof volume: large Victorian and Edwardian roofs often have enough volume for a full master suite.
- Head height: around 2.2 metres from floor to ridge is the usual starting point.
- Conservation area: check whether your road is in Wimbledon Village, Wimbledon West, Wimbledon North or Merton Park.
- Chimney stacks: party chimney breasts on older houses may need structural support or removal as part of the design.
House extension builders in Wimbledon
Wimbledon gardens are often deep, which gives plenty of room for generous extensions. Our house extension builders in Wimbledon build single-storey rear, side-return and wraparound extensions, as well as double-storey additions on larger plots where planning allows. We take care of foundations, steelwork, roofing and glazing, and design carefully where a property sits close to protected trees.
Trees matter in Wimbledon. Merton Council planning reports regularly refer to protected trees, and tree impact has led to refusals on some projects in conservation areas. We commission tree surveys early so foundations and layouts are designed around them.
Home renovation and refurbishment in Wimbledon
Large period houses in Wimbledon often need a lot more than a facelift. We carry out whole-house renovations and individual kitchens and bathrooms, coordinating plumbing, electrics, plastering and joinery under one team, with attention to original features such as fireplaces, cornicing and sash windows.
- 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 Wimbledon homes need an experienced local builder
Wimbledon's homes are some of the largest in our patch. Wimbledon Village has substantial Victorian and Edwardian villas, Wimbledon Park and Southfields have solid Edwardian terraces and semis, Raynes Park and Wimbledon Chase have rows of family terraces, and Merton Park is the John Innes garden suburb of Arts and Crafts style houses.
The London Borough of Merton has designated several conservation areas in SW19, including Wimbledon Village, Wimbledon West, Wimbledon North and the John Innes Merton Park area, which carries Article 4 directions dating from 1986, 1990 and 2007. In those areas, external changes that would normally be permitted development need planning permission.
Merton's local plan also includes a specific policy on basements, which opposes excavation under listed buildings and looks closely at lightwells, groundwater and trees. If a basement is part of your plan, an early conversation with a builder who understands the policy saves time.
Wimbledon houses are often larger than the national average, so structural spans, steelwork and roof loads are bigger and more complex than on a typical terrace. We use engineers experienced in large-span residential work and plan the sequence of works to protect the finished rooms you are living in.
Do you need planning permission to build in Wimbledon?
Many loft conversions and single-storey rear extensions in Wimbledon can go ahead under permitted development, but conservation areas, Article 4 directions and protected trees restrict those rights. Use the table as a guide and confirm your address with Merton Council.
| Project | Permitted development | Planning permission needed |
|---|---|---|
| Loft conversion (rear dormer) | Often yes, within volume limits (40 m³ terraced, 50 m³ semi-detached or detached) | Yes, in conservation areas such as Wimbledon West or Merton Park, or if limits are exceeded |
| 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 |
| Double-storey extension | No, planning permission is almost always needed | Yes, with close attention to neighbours and trees |
| Basement or lower-ground extension | No, excavation needs full planning permission | Yes, assessed against Merton's basement policy, including trees, flood risk and lightwells |
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 Wimbledon home?
Wimbledon's housing varies from large villas to compact terraces. Use this as a starting point, and we will confirm after a site visit.
| Property type | Where you find it | Popular projects |
|---|---|---|
| Victorian and Edwardian villa | Wimbledon Village, Wimbledon Hill | Large loft suites, double-storey extensions, whole-house renovation |
| Edwardian terrace and semi | Wimbledon Park, Southfields, Wimbledon Chase | Rear dormer or hip-to-gable loft, side-return extension |
| Garden suburb house | Merton Park (John Innes) | Sensitive renovation, careful rear extension, loft within strict rules |
| Family terrace | Raynes Park, Wimbledon Chase | Rear dormer loft, rear extension, kitchen refit |
Building in a Wimbledon conservation area
Merton Council has designated several conservation areas in SW19, and many carry additional controls. Always check your address before ordering drawings.
- Wimbledon Village, Wimbledon West and Wimbledon North are conservation areas with their own character assessments.
- The John Innes Merton Park conservation area has Article 4 directions from 1986 and 1990, plus Article 4(2) directions from July 2007.
- Trees in conservation areas are protected, and you must notify the council six weeks before cutting or pruning most of them.
- Roofs, front elevations, windows and front boundaries are controlled more tightly than elsewhere.
We review your address against Merton Council's conservation area maps before design starts, so you know early what is realistic.
What affects the cost of building work in Wimbledon?
No two Wimbledon projects cost the same. The main factors are:
- Scale of the house: larger villas mean larger structural spans, bigger roofs and more finishes.
- Project type: a rear dormer, a double-storey extension, a basement and a whole-house renovation have very different scopes.
- Trees and ground: tree surveys, root protection and ground conditions can influence foundations.
- Approvals: planning, heritage statements, structural engineering, Party Wall surveyors and Building Control.
- Finish level: high-spec kitchens, glazing and bathrooms 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 Wimbledon
Searching for a builder in Wimbledon brings up directories, aggregators and many firms. Whoever you choose, check these points first:
- Larger-project experience: ask whether they have delivered double-storey extensions, large lofts or basements and how they manage the structure and neighbours.
- Ask about large-house experience: double-storey extensions and big lofts need careful structure and sequencing.
- Check basement knowledge: Merton's basement policy is detailed, so ask how they handle applications.
- Ask about trees: tree surveys and root protection are common in Wimbledon, so ask how they are managed.
- Confirm neighbour handling: large projects affect more neighbours, so ask about communication and Party Wall notices.
- Insurance: ask to see public liability cover.
- Written estimate: an itemised scope, not a lump sum.
How a Wimbledon building project works with Crest Projects
Site visit and brief
We visit your Wimbledon home, listen to what you want, check access and parking around Wimbledon Village or Wimbledon Park, and survey the existing structure.
Design and approvals
Drawings, structural calculations, a check against London Borough of Merton 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 Southfields informed.
Handover
Final inspection, snagging, certificates and Building Control sign-off.
Local builders across Wimbledon SW19 and nearby
We work throughout Wimbledon SW19, including:
- Wimbledon Village
- Wimbledon Park
- Southfields
- Raynes Park
- Merton Park
- Wimbledon Chase
- Wimbledon Hill
- Wimbledon Common fringe
Also building nearby
- Builders in Putney
- Builders in Kingston
- Builders in Richmond
- Builders in Fulham
- Builders in Kensington
- Builders in Teddington
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 Wimbledon
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 Wimbledon: frequently asked questions
How much does a builder in Wimbledon cost?
Cost depends on the type, size, structure and finish of the project. Larger Wimbledon houses, double-storey extensions and basements are priced very differently from a standard rear dormer. Crest Projects gives a written, itemised estimate after a site visit. Our online cost calculator gives a starting figure.
Which parts of Wimbledon are in a conservation area?
Merton Council has designated several areas, including Wimbledon Village, Wimbledon West, Wimbledon North and John Innes Merton Park. Check the council's maps for your exact address. We do this before design starts.
Do I need planning permission for a loft conversion in Wimbledon?
Many Wimbledon loft conversions fall under permitted development, within volume limits, but not in conservation areas or where limits are exceeded. Front roof slopes are excluded. A lawful development certificate from Merton Council confirms your position.
Can I build a basement in Wimbledon?
A basement needs full planning permission and is assessed against Merton's local plan basement policy, which opposes excavation under listed buildings and closely examines lightwells, groundwater, flooding and trees. Feasibility depends on soil, neighbours and your street. We can advise early on whether it is realistic.
How do trees affect extensions in Wimbledon?
Trees are a common issue. In conservation areas you must notify Merton Council six weeks before pruning or felling most trees, and root protection areas can limit where foundations can go. Planning reports in the borough have refused schemes over tree impact. We commission tree surveys early.
What loft conversion suits a large Wimbledon villa?
Large Victorian and Edwardian villas often have enough roof volume for a full master suite or two bedrooms. A rear dormer, hip-to-gable or a combination may work, depending on roof shape and conservation area rules. We assess head height, structure and planning position before recommending a design.
Do you handle party wall agreements in Wimbledon?
Yes. Most Wimbledon terraces and semis 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.
Which Wimbledon areas do you cover?
We cover Wimbledon Village, Wimbledon Park, Southfields, Raynes Park, Merton Park, Wimbledon Chase and Wimbledon Hill, plus neighbouring areas such as Putney, Kingston and Richmond.
Can you build a double-storey extension in Wimbledon?
Often yes on larger plots, but planning permission is almost always needed and officers look closely at neighbours' light, privacy and design. In conservation areas and Article 4 streets the scrutiny is higher. We prepare drawings and supporting statements designed to be approved.
Do large Wimbledon projects need an architect and structural engineer?
Usually, yes. Double-storey extensions, big lofts and basements need drawings for planning and structural calculations for Building Regulations. We work with architects and engineers we trust, or with yours, and manage the build once the design is approved.
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 Wimbledon 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 Wimbledon?
Speak to a builder with over 20 years of experience. Tell us about your Wimbledon project and we will arrange a site visit and written estimate.
Crest Projects Ltd, 128a Boston Rd, London W7 2HJ