Premium Builders in Dulwich
Bespoke luxury extensions, renovations and loft conversions for Dulwich's charming Victorian villas and conservation area properties, SE21.
Builders in Dulwich, SE21
Dulwich is South London's most enchanting residential enclave, where a village-like atmosphere, magnificent period architecture, and the stewardship of the Dulwich Estate create a property market of extraordinary prestige. The area's charming Victorian villas, set along tree-lined avenues and surrounded by the verdant expanse of Dulwich Park and the Picture Gallery grounds, attract discerning homeowners who value heritage, community and understated elegance. Alstruct Ltd brings a refined, conservation-sensitive approach to every Dulwich project, ensuring that enhancements are executed with the utmost respect for the area's unique character.
From the stately detached houses of Dulwich Village to the substantial Victorian and Edwardian properties along College Road and Calton Avenue, SE21 offers some of London's most desirable family homes. These properties frequently benefit from generous plots and mature gardens, presenting exceptional opportunities for bespoke rear extensions, premium loft conversions, and meticulously planned whole-house renovations. Our craftsmen specialise in sympathetic design that seamlessly integrates contemporary luxury with period authenticity, using traditional materials and construction techniques alongside the finest modern innovations.
With West Dulwich station on the Overground providing convenient connectivity, outstanding schools including Dulwich College and James Allen's Girls' School, and the cultural richness of the Dulwich Picture Gallery, this area attracts families who invest generously in creating homes of lasting distinction. Alstruct's intimate understanding of both Southwark Council's planning framework and the Dulwich Estate's architectural guidelines ensures every project navigates the approval process with elegance and efficiency.
Why Choose Alstruct in Dulwich?
- Conservation area specialists with deep sensitivity to Dulwich's architectural heritage
- Applications to Southwark Council and the Dulwich Estate prepared by our design team
- CHAS Elite, Constructionline Gold & FMB certified for unwavering quality assurance
- Bespoke design that harmonises contemporary luxury with period authenticity
- Heritage-appropriate materials combined with cutting-edge building techniques
- Dedicated project manager with meticulous attention to every detail
- Transparent, comprehensive quotations reflecting the true scope of works
- Published case studies with scope, programme and budget
Luxury Construction Services in Dulwich
House Extensions Dulwich
Conservation-sensitive rear, side and wraparound extensions that enhance Dulwich's Victorian villas with sympathetic contemporary design.
Learn more →Loft Conversions Dulwich
Premium loft conversions designed to complement Dulwich's period roofscapes, creating sumptuous master suites and study retreats.
Learn more →Home Renovations Dulwich
Exquisite whole-house renovations that restore and enhance Dulwich's heritage properties with contemporary luxury and period-appropriate details.
Learn more →Basement Conversions Dulwich
Bespoke basement excavation and conversion creating premium subterranean spaces beneath Dulwich's substantial detached and semi-detached villas.
Learn more →Groundworks Dulwich
Expert foundations, drainage and site preparation executed with care and precision for luxury construction projects throughout SE21.
Learn more →Hard Landscaping Dulwich
Exquisite garden designs, natural stone terracing, heritage-style boundary walls and elegant outdoor spaces for Dulwich properties.
Learn more →House and kitchen extensions in Dulwich
Dulwich has Victorian and Edwardian villas and terraces around Dulwich Village, East Dulwich and West Dulwich, with 1930s houses towards Sydenham Hill. Kitchen extensions with garden glazing and side-return infills are the common Dulwich projects; basements are popular on the larger Village houses.
Budget guidance for Dulwich: expect £2,500–£4,000 per m² for a single-storey extension, which puts a 25–30 m² kitchen extension at £75,000–£120,000; two-storey and wraparound schemes are priced on the structure involved (see our house extension cost guide). Many Dulwich homes are on the Dulwich Estate, whose Scheme of Management consent is needed on top of Southwark Council planning, and Dulwich Village is a conservation area. Where approval from Southwark Council is needed, our design team prepares and submits the application.
Planning a kitchen extension? See our kitchen extensions page for layouts, glazing and costs.
Loft conversions in Dulwich
Dulwich roofs suit rear dormers and, in the Village, mansards or flush dormers; many Edwardian houses have the height for a two-room conversion.
Typical London figures are £25,000–£45,000 for a Velux conversion, £45,000–£75,000 for a dormer and £60,000–£100,000+ for a mansard (details in our loft conversion cost guide). Every Dulwich loft quote follows a measured survey of the roof, head height and stair position, and includes Building Regulations sign-off, fire doors and structural calculations.
Renovations and refurbishment in Dulwich
Dulwich renovations are usually full refurbishments of period houses, restoring features while adding modern kitchens, bathrooms and services. Typical Dulwich refurbishments include structural openings with steel beams, new kitchens and bathrooms, rewiring, heating and period repairs such as sash windows, cornices and floors. Budgets are set out in our renovation cost guide; in Dulwich, as everywhere, we work to a JCT contract, a written specification and a 10-year workmanship warranty.
Guides for homes in Dulwich
For the Victorian and Edwardian terraces that make up much of Dulwich, our most useful guides are side return extension costs, dormer loft conversion costs, party wall costs, bay window structural problems and leaking lead roof valleys.
Planning approvals in Dulwich
Southwark Council approved 95.0% of householder planning applications decided between September 2025 and August 2026, against a London average of 85.8%; a typical decision took about 7.4 weeks from validation. Loft conversions that needed planning permission were approved 94.6% of the time and extensions 95.8%.
See how every London borough compares, including loft and extension approval rates, in our 2026 London planning approvals study.
Alstruct projects near Dulwich
Limehouse Cottage, E14
Underpinning, ground and first-floor extensions and a full renovation with bespoke joinery.
View project →Wimbledon Victorian Terrace, SW19
A Victorian terrace extended and reconfigured, with a dormer loft bedroom, three bathrooms and a low-carbon refit.
View project →Bow Victorian Terrace, E3
Victorian terrace: ground-floor lowering, underpinning, flat-roof extension and large roof glazing.
View project →We work across every London borough from our office in South Woodford, E18. See all completed projects →
Common questions about building in Dulwich
Do I need planning permission for an extension in Dulwich?
Houses in Dulwich (not flats or maisonettes) keep national permitted development rights for a single-storey rear extension of 3m attached or 4m detached, up to 6m or 8m through prior approval, and for most rear dormers (40 cubic metres on a terrace, 50 elsewhere). Southwark Council's Dulwich Village, Dulwich Wood and Sunray Estate conservation areas cover parts of the area. A conservation area keeps the single-storey rear right but removes rights for side extensions, two-storey rear extensions, cladding and roof additions. Sunray Estate also has an Article 4 direction. Homes on the Dulwich Estate need the Estate's own consent as well.
What does Southwark Council expect for loft conversions in Dulwich?
Southwark's Householder Development SPD (July 2025) applies. Outside conservation areas a rear dormer should not face the street, should stay below the ridge and sit at least 0.2m back from the eaves. In a conservation area any roof extension needs permission; dormers should be symmetrical, 0.5m below the ridge, 1m above the eaves and 1m in from the party wall, and box dormers will not be permitted. Every mansard needs planning permission. On Dulwich Estate homes a loft also needs the Scheme of Management Office's written approval, separate from planning.
What does a side return extension or dormer loft cost in Dulwich?
For the Victorian and Edwardian terraces of East and West Dulwich, a side return extension at mid to high specification is typically £65,000–£130,000 including VAT; our side return extension cost guide explains what drives the figure. A rear dormer loft conversion is £45,000–£75,000 and an L-shaped dormer £55,000–£85,000, both including VAT, with the breakdown in our dormer loft conversion cost guide. The final price depends on the structure, glazing and finish you choose.
Which Alstruct projects are nearest to Dulwich?
Our nearest published projects are Limehouse Cottage, E14, about 4.9 miles away: underpinning, ground and first-floor extensions and a full renovation with bespoke joinery; Wimbledon Victorian Terrace, SW19, about 5.6 miles away: a Victorian terrace extended and reconfigured, with a dormer loft bedroom, three bathrooms and a low-carbon refit; and Bow Victorian Terrace, E3, about 6.3 miles away: a Victorian terrace with ground-floor lowering, underpinning, a flat-roof extension and large roof glazing.
Which parts of Dulwich do you cover?
We cover SE21 and the wider Dulwich area, including Dulwich Village, East Dulwich, West Dulwich and the streets towards Sydenham Hill. Planning is handled by Southwark Council, although the Dulwich Estate notes that some of its land falls in Lambeth and Lewisham. We work from our office in South Woodford, E18, about 11 miles away, and also cover nearby Peckham, Brixton and Lewisham.
Nearby areas we cover
Alstruct works across every London borough. Here are areas close to Dulwich with dedicated local pages: