Premium Builders in Bromley
Bespoke luxury extensions, renovations and loft conversions for Bromley's substantial detached and semi-detached family homes, BR1.
Luxury Construction Services in Bromley, BR1
Bromley commands a distinguished position as London's largest borough, offering an exceptional residential environment where substantial detached and semi-detached homes sit within generous plots along leafy, established streets. The area's property market attracts affluent families seeking the space and quality of life that Bromley provides, combined with fast Southeastern rail connectivity to London Bridge and Victoria from Bromley South station. Alstruct Ltd delivers a premium construction service perfectly calibrated to Bromley's ambitious homeowners and their substantial properties.
The borough's housing stock is remarkably diverse, encompassing grand Victorian residences, imposing Edwardian semis, elegant 1930s detached houses, and substantial modern family homes across areas such as Bickley, Shortlands, and Sundridge Park. This diversity presents exceptional opportunities for transformative construction projects — from spectacular double-storey extensions that double a property's footprint to exquisite whole-house renovations that reimagine tired interiors as contemporary luxury living spaces. Alstruct's team of skilled craftsmen and project managers bring meticulous attention to detail and premium-grade materials to every commission.
With Bromley's larger plot sizes and more generous Permitted Development allowances compared to inner London, homeowners can often achieve remarkably ambitious extensions and conversions. Alstruct's planning expertise ensures you maximise every opportunity, delivering bespoke results that significantly enhance both your lifestyle and your property's substantial market value.
Why Choose Alstruct in Bromley?
- Specialists in large-scale extensions for Bromley's substantial detached properties
- Expert knowledge of Bromley Council planning policies and permitted development
- CHAS Elite, Constructionline Gold & FMB certified for delivered standards
- Bespoke architectural design maximising Bromley's generous plot potential
- Premium materials and finishes selected for durability and aesthetic distinction
- Dedicated project manager providing clear communication at every stage
- Transparent, detailed quotations with fixed-price certainty
- Published case studies with scope, programme and budget
Frequently Asked Questions — Bromley
What does a luxury extension cost in Bromley, BR1?
Premium extensions in Bromley typically cost £3,200-£4,500 per square metre at high specification, or £2,500-£3,200 at mid-range. A bespoke rear or side extension on a large detached property typically costs £80,000-£160,000, while a premium loft conversion ranges from £55,000-£100,000. Bromley's larger plot sizes often allow for more ambitious extension designs than inner London boroughs.
Do I need planning permission for a large extension in Bromley?
Many Bromley properties benefit from generous Permitted Development allowances, particularly detached homes. However, properties within conservation areas or those with Article 4 directions may require full planning permission. Alstruct's planning specialists navigate Bromley Council's requirements expertly, maximising what can be achieved.
Can Alstruct build large double-storey extensions in Bromley?
Absolutely. Bromley's larger detached and semi-detached properties are ideal candidates for substantial double-storey extensions. These projects can add multiple bedrooms, expanded living areas, and impressive entrance halls. Alstruct builds these larger additions under a JCT contract, at a fixed, itemised price.
What style of renovation works best for Bromley's housing stock?
Bromley's diverse housing stock suits a range of renovation approaches. We frequently deliver contemporary open-plan kitchen extensions, bespoke loft conversions with premium en-suites, and complete whole-house refurbishments that modernise interiors while enhancing kerb appeal and property value.
Luxury Construction Services in Bromley
House Extensions Bromley
Substantial rear, side, wraparound and double-storey extensions that maximise Bromley's generous plots with premium contemporary design.
Learn more →Loft Conversions Bromley
Premium dormer, hip-to-gable and mansard loft conversions creating luxurious additional bedrooms and en-suites in Bromley homes.
Learn more →Home Renovations Bromley
Complete luxury renovations that modernise and elevate Bromley properties with bespoke kitchens, designer bathrooms and open-plan living.
Learn more →Basement Conversions Bromley
Expert basement excavation creating premium subterranean living spaces, home cinemas and gyms beneath Bromley's substantial homes.
Learn more →Groundworks Bromley
Professional foundations, drainage solutions and site preparation for large-scale construction projects across the Bromley borough.
Learn more →Hard Landscaping Bromley
Bespoke driveways, garden terraces, retaining walls and premium outdoor living spaces that complete your Bromley property transformation.
Learn more →House and kitchen extensions in Bromley
Bromley has Victorian villas and terraces around the town centre and Bickley, Edwardian houses towards Sundridge Park, and large numbers of 1930s semis and detached homes across the borough. The semis and detached houses give room for wide single-storey rear extensions with a kitchen-family room, and two-storey side extensions for an extra bedroom; the Victorian villas suit orangery-style additions.
As a guide, a well-built single-storey rear or side-return extension in Bromley costs around £2,500–£4,000 per m² including structure, glazing and finishes, so a typical 25–30 m² kitchen extension lands between £75,000 and £120,000. Our house extension cost guide explains what moves the price. Bickley Park and Sundridge Park are conservation areas; elsewhere Bromley Council's permitted development rules allow most single-storey extensions without a full application. We confirm permitted development rights at the first visit and handle any application to Bromley Council through our in-house design team.
Planning a kitchen extension? See our kitchen extensions page for layouts, glazing and costs.
Loft conversions in Bromley
Hip-to-gable with a rear dormer is the standard Bromley loft on the 1930s stock and often yields two rooms; the Victorian houses have tall roofs that convert well.
In London a Velux conversion costs £25,000–£45,000, a dormer loft with a bedroom and en-suite £45,000–£75,000 and a mansard £60,000–£100,000+; our loft conversion cost guide sets out what is included. We survey the roof structure, head height and stair position before we quote a Bromley loft, so the figure reflects the actual roof rather than an assumption.
Renovations and refurbishment in Bromley
Bromley renovations are typically whole-house updates of interwar homes: new kitchens, bathrooms, heating, rewiring and open-plan ground floors. Typical Bromley refurbishments include structural openings with steel beams, new kitchens and bathrooms, rewiring, heating and period repairs such as sash windows, cornices and floors. Our Victorian terrace renovation cost guide gives realistic budgets, and every Bromley project runs on a JCT contract with a written specification and our 10-year workmanship warranty.
Planning approvals in Bromley
Official government figures show Bromley Council approved 78.6% of householder planning applications decided between July 2025 and June 2026, against 85.8% across London.
See how every London borough compares, including loft and extension approval rates, in our 2026 London planning approvals study.
Recent Alstruct projects across London
Limehouse Cottage, E14
Underpinning, ground and first-floor extensions and a full renovation with bespoke joinery.
View project →Lyal Road, Bow E3
Victorian terrace: ground-floor lowering, underpinning, flat-roof extension and large roof glazing.
View project →Keogh Road, Stratford E15
Zinc-clad loft conversions, kitchens, bathrooms and structural works on two Victorian terraces.
View project →Our nearest recent sites to Bromley are in E14 and SW19 (about 7.5 miles away). We work across every London borough from our office in South Woodford, E18, and regularly take on projects further out. See all completed projects →
Common questions about building in Bromley
Do Alstruct cover Bromley?
Yes. Alstruct takes on extensions, renovations and loft conversions in Bromley and the surrounding neighbourhoods, working across every London borough from our office in South Woodford, E18. We visit, measure and provide a written, fixed-price quote.
How much does a house extension cost in Bromley?
As a guide, our published London figures at mid to high specification are £80,000–£160,000 for a single-storey rear extension, £65,000–£130,000 for a side return, £170,000–£320,000 for a double-storey and £190,000–£380,000 for a wrap-around. 1930s semis and edwardian family homes are the most common build type in the area, and our quote will reflect the specific condition and layout of the property. Our house extension cost guide sets out what those figures include.
Do I need planning permission for an extension in Bromley?
Many single-storey rear extensions in Bromley fall under Permitted Development rights and don't require planning permission, but larger or two-storey extensions usually need approval from Bromley Council. We assess this during the free consultation and prepare any application required.
What types of property do you work on in Bromley?
1930s semis and Edwardian family homes are the most common homes in Bromley. We survey the structure, check the planning and building regulations position and price from what we find, so the quote reflects your property rather than an assumption. Our completed projects show the Victorian and 1930s houses we have extended and refurbished across London.
How quickly can Alstruct start a project in Bromley?
Once design and approvals are signed off, we typically start on site in Bromley within 6–12 weeks depending on programme availability. Design, planning and building regulations typically take 3–6 months before that. For urgent projects, get in touch on 020 8080 8240 to discuss timing.
Are you accredited to work in Bromley?
Yes. Alstruct holds CHAS Elite, Constructionline Gold and Federation of Master Builders (FMB) accreditation, with £10M public liability insurance, JCT contracts as standard, and a 10-year workmanship warranty on every project — including all work in Bromley.
Nearby areas we cover
Alstruct works across every London borough. Here are areas close to Bromley with dedicated local pages: