Builders & Renovation Specialists in Forest Hill
Kitchen extensions, loft conversions, bathrooms and full renovations in Forest Hill, South East London (SE23)
NICEIC, FENSA and CHAS accredited. 57+ Google reviews averaging 4.5 stars. Free site visit, fixed-price quote.
About Forest Hill
Forest Hill is a popular residential area with a strong sense of community, centred around the Horniman Museum and the high street. The housing stock includes handsome Victorian terraces, solid Edwardian semis, and inter-war houses, many of which offer excellent renovation potential. Property values are rising as families discover the area as an affordable alternative to Dulwich and Honor Oak.
Postcodes we cover: SE23
Popular Services in Forest Hill
Kitchen extensions lead the demand in Forest Hill, with Victorian terrace owners extending into their rear gardens to create open-plan kitchen-diners. Loft conversions are the second most popular project, particularly dormer conversions on the Edwardian semis that add a full bedroom and en-suite. Property renovation is growing as more buyers purchase period homes in SE23 and commission full refurbishments to create modern living spaces while preserving period character.
Planning & Building Control in Forest Hill
Forest Hill falls under Lewisham Council. The Forest Hill Conservation Area covers parts of the town centre and surrounding streets, with requirements for appropriate materials and design. Most residential streets outside the conservation area have standard permitted development rights for rear extensions, loft conversions, and outbuildings. Lewisham Council is responsive and their planning portal is straightforward for checking constraints on specific properties.
Forest Hill Property Insights
The Victorian terraces in Forest Hill are typically built with London stock brick and have sound structural bones, though many properties on the hillside have stepped foundations following the slope. The Edwardian semis often have good-sized loft spaces with potential for conversion. The SE23 postcode sits on a mix of London Clay and Thanet Sand, with ground conditions varying depending on elevation — properties on the hill may have different foundation requirements from those at the bottom. The mature trees around the Horniman Gardens can affect nearby foundations through clay shrinkage.
Common Projects in Forest Hill
Single-storey rear kitchen extension on a Victorian terrace
The leading project in Forest Hill. The Victorian terraces along Devonshire Road, Honor Oak Road, and the streets towards Honor Oak Park have classic narrow rear kitchens that get transformed by 4-5 metre rear extensions with bifold doors and roof lanterns. Cost is from £55,000 including structural steelwork, foundations (varies between London Clay on lower ground and Thanet Sand on the hill), glazing, electrics, plumbing, and finishes. Build time 12-14 weeks. Lewisham Council's permitted development process is straightforward for the standard 3-metre rear extension. Properties within the Forest Hill Conservation Area need extra design review.
Dormer loft conversion on an Edwardian semi
Forest Hill's Edwardian semis around Stanstead Road and the streets towards Brockley have generous loft spaces that suit dormer conversions, creating a master bedroom with en-suite plus space for a second bedroom or home office. Cost is from £55,000 including structure, staircase, en-suite plumbing, electrics, plastering, and decoration. Build time 10-14 weeks. The hillside means scaffolding setup is sometimes more involved than on flat sites — we use stepped scaffolding or adjustable-leg scaffold for the steeper streets, which adds half a day to setup.
Full property renovation
Forest Hill attracts buyers who couldn't afford Dulwich or Honor Oak but want similar period housing stock. Full renovations typically include rewiring to BS 7671, replumbing, knocking through the ground floor, new kitchen and bathrooms, plastering, and complete decoration. Cost is from £80,000 depending on size and specification. Build time 16-22 weeks with a single project manager. Original features (cornicing, ceiling roses, parquet flooring) are protected during structural work — typically adding £15,000-£30,000 to property value at sale time.
Hillside extension with stepped foundations
A Forest Hill-specific project type. The streets running up the hill (Sydenham Hill, Westwood Park, the upper section of Devonshire Road) have rear gardens that drop noticeably from the house. Standard strip foundations don't work on slopes — we use stepped foundations or short retaining walls to create a level base for the extension. The structural engineer specifies the foundation design after a trial hole investigation. Adds £4,000-£8,000 to typical extension cost compared with a flat-site equivalent. The result is an extension that sits level with the existing ground floor and accesses the garden via shallow steps.
Our Services in Forest Hill
Kitchen Extensions
We design and build kitchen extensions that turn cramped, separate rooms into open-plan spaces you actually want to cook and eat in.
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Bathroom Fitting
Full bathroom renovations, from stripping out tired suites to fitting walk-in showers, freestanding baths, and underfloor heating.
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Side Return Extensions
That narrow alley down the side of your terrace? We turn it into usable kitchen space.
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Loft Conversions
Add a bedroom, en-suite, or home office without moving house.
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Painter & Decorator
Clean lines, sharp edges, and a finish that lasts.
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Property Renovation
Whole-house renovations managed by one team — structural work, rewiring, replumbing, kitchens, bathrooms, and decoration.
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Damp Proofing
Damp ruins walls, damages health, and knocks thousands off your property value.
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Garage Conversions
Your garage is wasted space.
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End of Tenancy Painting
Tenants out Friday, painters in Monday, keys back by Thursday.
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Media Wall Installation
We design and build bespoke media walls — the framework, the joinery, the electrics, and the finish.
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Exterior Painting & Decorating
Exterior house painting that survives the British weather.
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Dormer Loft Conversions
We build rear and L-shaped dormer loft conversions on Victorian and Edwardian terraces across South London, adding full standing headroom and a proper top-floor room.
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Mansard Loft Conversions
A mansard loft conversion rebuilds the rear roof slope to a near-vertical wall at around 70 degrees, which gains the most floor space and headroom of any loft type.
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Hip to Gable Loft Conversions
A hip to gable loft conversion squares off the sloping hip end of a roof into a vertical gable wall, gaining real width and head height across the loft.
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Velux Loft Conversions
A rooflight loft conversion keeps the existing roof shape and fits skylights into the slope.
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Bungalow Loft Conversions
Turning a single-storey bungalow into a two-storey home by building into the roof space, usually with a hip-to-gable and rear dormer that add bedrooms and an en-suite upstairs.
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Wet Room Installation
A fully tanked, level-access wet room built around the drain: gradient floor, membrane carried to ceiling height and cured, then tiled.
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Walk-in Shower Installation
Walk-in showers built with frameless glass, a low-profile tray or level access, recessed tiled niches and proper tanking behind every tile.
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Microcement Bathrooms
A microcement bathroom gives you one continuous polished cement surface across walls and floor, with no grout lines for mould to colonise.
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Luxury Bathrooms
High-specification bathrooms built around natural stone, large-format porcelain and quality brassware, with freestanding baths, underfloor heating and layered lighting set out at the design stage.
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Interior Painting & Decorating
Interior painting and decorating across South London, from a single room to a full house.
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Commercial Painting
Commercial painting for offices, shops and communal areas across South London.
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Spray Painting & Kitchen Respray
Spray painting that gives a factory-flat finish brush and roller cannot reach.
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Handyman & Property Maintenance
A reliable local handyman backed by a proper building firm.
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Gutter Cleaning
We clear blocked gutters and downpipes on terraces, semis and larger houses across South London, then check the falls and the joints while we are up there.
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Furniture & Flat-Pack Assembly
Flat-pack wardrobes, beds, chests and units built square and solid, with every fixing seated so nothing wobbles and tall pieces anchored to the wall.
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Fence Repair
Storm-damaged and rotten fences put right across South London.
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TV Wall Mounting
A TV mounted properly, fixed into studs or masonry to hold the weight, set level at the right height, with the cables run out of sight rather than left hanging down the wall.
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What Customers Say
“So happy with the work done by Les and Richard!! We bought a house that needed new paint, cracks filled, a new bathroom fan and some mold removal and they did it all. The quality of the work is phenomenal; it looks like a brand new house. We’ll definitely be hiring them for our future projects!”
Brenna Bodine
3 months ago
“So happy with Joel’s work in refurbishing my flat. There was no job too big or small for him and all done to a high standard. I won’t hesitate to use him again!”
Callum Stone
4 months ago
All Well has completed 100+ projects across 25 London boroughs since 2020. We are NICEIC approved for electrical work, FENSA registered for glazing, and CHAS certified for site safety, with Public Liability insurance to £5 million. 57+ Google reviews average 4.5 stars. All Well Property Services® is a UK registered trademark, Companies House no. 12721034, operating from Unit 1 Limes Avenue, Anerley SE20 8QR.
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Frequently Asked Questions
- How does the Forest Hill hillside affect renovation costs?
- Two factors. First, foundations: properties on the hill often need stepped foundations or retaining walls to create level extensions, adding £4,000-£8,000 to typical extension cost. Second, scaffolding: standard scaffold towers don't sit level on noticeable gradients, and we use stepped or adjustable-leg scaffolding on the steeper streets. The mix of London Clay (lower ground) and Thanet Sand (the hill) means foundation depths vary from property to property — a trial hole at the survey gives the structural engineer the data needed to specify the right foundation. Total premium over flat-site equivalent: typically 8-15%.
- Do mature trees around Horniman Gardens affect foundation depth?
- Yes, on properties within 1-1.5 times tree height of mature trees. The mature trees around the Horniman Gardens, plus large suburban trees on the bigger plots, extract moisture from clay subsoil and can cause clay shrinkage that triggers subsidence. Properties within range need deeper foundations of 1.5-2.0 metres or piled foundations to avoid movement. The structural engineer specifies foundation depth based on a trial hole and tree survey. Tree Preservation Orders are common and removing trees for an extension is rarely permitted. Adds £3,000-£8,000 to extension cost on affected properties.
- Are there conservation areas in Forest Hill?
- Yes. The Forest Hill Conservation Area covers parts of the town centre and the surrounding streets. Properties within the area need sympathetic design for visible alterations — window replacement, render colour, front door changes, and dormers all need consideration. Lewisham Council can act on retrospective unauthorised changes. Front-facing dormers on loft conversions are generally refused; rear dormers are accepted with subordinate proportions. Most residential streets outside the conservation area have full permitted development rights for standard rear extensions and loft conversions. We check the conservation area boundary on the Lewisham planning portal before quoting any exterior work.
- What's the typical timeline for a Forest Hill renovation?
- Depends on scope. Full property renovations of a Victorian terrace take 16-22 weeks with one team. Single-storey rear kitchen extensions take 12-14 weeks. Dormer loft conversions take 10-14 weeks. Bathroom renovations take 3-5 weeks. We give a detailed programme of works at the contract stage and photo updates throughout the build throughout. Hillside projects have weather-dependent groundwork on the early phases (foundations and external structure), so we recommend starting between March and October where possible to avoid winter delays. Larger projects spanning autumn into winter usually have the structure complete before November.
Get a Free Quote in Forest Hill
Tell us your project and we will book a free site visit, then send a fixed-price quote in writing. No obligation.