Bromley is London’s largest borough by area, and it feels more like a group of towns than one place: Victorian terraces in Beckenham and Penge, interwar suburbs in Petts Wood and Bromley town, and Green Belt villages around Chislehurst, Orpington and Downe. Space is what draws people here, and most projects are about using it better.
London Building Contractors
Builders in Bromley Who Get the Job Done Properly
What We Do
Building Services from Bromley Builders
Every service below is delivered by our own in-house tradespeople, fixed-price and fully insured, so you get dependable builders in Bromley from survey to handover.
Loft Conversions in Bromley
Transform your home with expert loft conversions in London by Alpha London Builders. From design and planning to construction, we deliver quality loft conversions tailored to your needs.
Learn more →House Extensions in Bromley
Rear, side return, wraparound and double storey extensions designed and built to fit seamlessly with your London home.
Learn more →Basement Conversions in Bromley
Cellar conversions, basement lowering and full new excavations, engineered and waterproofed to BS 8102 by our in-house team.
Learn more →Garage Conversions in Bromley
Integral, attached and detached garage conversions into bedrooms, offices and annexes, most without planning permission.
Learn more →Property Refurbishment in Bromley
Cosmetic updates through to full structural refurbishments, managed under one dedicated site manager from start to finish.
Learn more →General Building in Bromley
Repointing, roof repairs, damp treatment, brickwork and small structural alterations, carried out by our own trades.
Learn more →Design & Build in Bromley
One team, one contract, one fixed price for design, planning, structural engineering and construction on your project.
Learn more →New Builds in Bromley
New homes and replacement dwellings built from foundation to final finish, with zero-rated VAT on construction costs.
Learn more →Commercial Building in Bromley
Office, retail and restaurant fit-outs across London, delivered around your trading hours with minimal disruption.
Learn more →Residential Building in Bromley
The full range of residential building work, from a single repair to a new build, delivered by one London contractor.
Learn more →Building Demolition in Bromley
Safe, fully licensed demolition work across London, from internal wall removal to complete house demolition ahead of a new build.
Learn more →Why Choose Us
Why Choose Our Bromley Builders
Roof-alteration rules checked
Some Bromley streets have lost permitted development rights for roof alterations, so a dormer there needs an application. We find out at survey, not after the drawings.
Green Belt realism
In Chislehurst, Orpington and beyond, we say honestly how much a house can grow before you spend on design.
Interwar suburb know-how
Petts Wood, Bickley and Bromley town have large 1930s houses, and we are used to extending them without losing the look of the street.
Victorian terraces too
Beckenham and Penge terraces need a different approach from the semis, with side returns and outriggers, and we price them separately.
Local Knowledge
Building & Planning Considerations in Bromley
Bromley has Article 4 directions that remove roof extension and alteration rights (Part 1, Classes B and C) in some areas, and a separate direction covering the conversion of houses to small HMOs. The Petts Wood Area of Special Residential Character has its own controls, and conservation areas such as Beckenham add further limits. A large part of the south and east of the borough is Metropolitan Green Belt, where extensions are judged against the size of the original house. Elsewhere, most semis and detached houses keep standard permitted development rights.
As Bromley builders, every quote we provide for a Bromley property starts with a check against Bromley Council's conservation area maps and Article 4 register, so you know exactly which route your project needs before any design work begins.
Local Guide
Building in Bromley: what to know before you start
From Penge terraces to Green Belt villages
Beckenham and Penge are mostly Victorian terraces and semis, where an outrigger and a rear dormer are the usual ways to gain space. Bromley town, Petts Wood and Bickley have larger interwar houses on generous plots. Chislehurst, Orpington and the villages further out are where Green Belt policy bites hardest, and a good design starts from what the house looked like when it was first built.
What to expect from each project type
On the interwar houses, a house extension in Bromley can be large, but check for roof-alteration Article 4 coverage before assuming a dormer is allowed. Loft conversions are the best fit on the terraces and semis. Detached houses with a double garage often suit a garage conversion, and larger older houses suit a full refurbishment.
The check that saves most money
Ask whether your road is covered by Bromley's roof-alteration Article 4 directions. If it is, even a rear dormer needs an application, which changes the timeline and the budget. We find this out at survey, before any design fees are spent, and tell you plainly if a Green Belt site is likely to be a hard sell.
What we do in Bromley: Loft conversions in Bromley · House extensions in Bromley · Basement conversions in Bromley · Garage conversions in Bromley · Property refurbishment in Bromley
Worth reading first: Do you need planning permission for a loft conversion? · Building Regulations vs planning permission
Nearby: Builders in Croydon · Builders in Bexley
Ready to talk? Book a free site survey and we will tell you in writing which planning route your address needs.
Areas We Cover
Areas We Cover in Bromley
Bromley Town
Beckenham
Orpington
Chislehurst
Petts Wood
Penge
Bickley
West Wickham
Don't see your street listed? Our builders in Bromley cover the whole borough and the surrounding area — get in touch to check.
Our Work
Recent Bromley Projects
A look at recent work carried out for clients in and around Bromley.
Open-Plan Kitchen Renovation
A dated, closed-off kitchen opened up into a bright, modern open-plan kitchen with new cabinetry, worktops, and appliances.
View Project →
Mansard Roof Loft Conversion
An under-used loft transformed into three light-filled bedrooms and a family bathroom, with a full mansard roof extension built to Building Control standards from start to finish.
View Project →What Clients Say
Reviews from Bromley
“Our extension took exactly as long as they told us it would, which after two quotes from other builders felt like a small miracle. Would use them again without hesitation.
”
Amara Okafor
Rear Extension, Leyton
Common Questions
FAQs About Builders in Bromley
Does the Green Belt in Bromley mean I cannot extend my house?
No. Green Belt policy restricts disproportionate additions to the original dwelling, not extensions as such. A modest, well-proportioned extension is often approved, but earlier extensions count towards the total, so we start by measuring what the house was when first built.
Do I need planning permission for a rear dormer in Petts Wood?
Possibly. Bromley has Article 4 directions removing the permitted development rights for roof extensions and alterations in some areas, and Petts Wood has its own Area of Special Residential Character controls. Check the council's map for your road, or let us do it at survey.
Can I turn a house in Bromley into a small HMO without planning permission?
Not where Bromley's Article 4 direction on HMOs applies, which removes the right to change a family home into a small shared house without an application. Check the direction's map for your address before you buy or convert.
Is a loft conversion a good fit for a Beckenham Victorian terrace?
Often, yes, usually as a rear dormer. Terraced houses have a 40 cubic metre allowance rather than 50, so the room is tighter than on a semi. Beckenham has a conservation area and Bromley's roof-alteration directions may apply, so we check both first.
Ready When You Are
Get a Free Quote from Our Bromley Builders
Free site survey, a fixed-price quote within 48 hours, and one team from first fix to final handover.
Get My Free Quote →