9 Best Builders in Beckenham for 2026

🏗️ 9 businesses · 📍 Beckenham
✓ Reviewed regularly · ✓ Updated 22 October 2026
Mark Reid
Written by Mark Reid, Trades Editor · Verified 22 October 2026
Beckenham's housing stock does a lot of the talking when you hire a builder here. You've got big Victorian and Edwardian semis around Park Langley and the Conservation Area, 1930s houses stretching towards Eden Park and Elmers End, and plenty of post-war terraces closer to Clock House and Kent House. Each throws up its own jobs. Period homes mean lime-friendly repointing, sash repairs and the odd surprise behind a chimney breast. 1930s semis tend to mean rear extensions, loft conversions with dormers, and knocking through for open-plan kitchens. London clay is the norm here, so foundations for extensions often need deeper trenches or piles, and nearby trees can make that a bigger conversation than you'd expect.

We pulled the businesses on this page from third-party business listings and ranked them by public review rating and review count, with a small lift for those showing a working website and phone number. We then read each business's homepage to confirm builders work is what they primarily offer, which keeps unrelated businesses off the page. Permanently closed listings are removed automatically. Where you see a Trust Verified badge, that business has also passed our full verification, covering trade qualifications and accreditations, public liability insurance, trading history, customer review history and registered company information. Our How We Verify page has the full list. If a business doesn't carry the badge, we haven't independently checked those things, so you'll want to do it yourself before you book.

Get at least two or three written quotes, and make sure they're itemised so you can compare like for like. Ask to see proof of public liability insurance and check the policy covers the value of your job. Ask whether they hold relevant trade accreditation, and confirm it with the issuing body rather than taking a logo on a van as proof. For extensions and lofts, ask who handles building regulations sign-off and, if you're in a party wall situation with a neighbour, who serves the notices. Agree a payment schedule tied to stages of work, not big sums upfront. Ask for recent local jobs you can see, and read online reviews for the detail, not just the star rating.
How We Select & Rate The Best Builders in Beckenham

Businesses are ranked by public review rating and review count drawn from third-party business listings, with a small lift for those showing a working website and phone number. We read each business's homepage to confirm builders work is what they primarily offer. Permanently closed listings are removed automatically. Businesses marked Trust Verified have additionally passed our full verification, covering trade qualifications and accreditations, public liability insurance, trading history, customer review history and registered company information. Our How We Verify page has the full list. Other businesses on this page have not been independently verified by us, and inclusion is not an endorsement. Always do your own checks before hiring.

Recommended and Featured listings are paid placements, so a business's fee affects whether and where it appears. Every other listing is ranked on rating and review count from third-party business listings. How we rank & verify →

Quick Comparison: Builders in Beckenham

Our Top Picks

1
All Well Property Services
Not Verified
★★★★★ 4.9 (58 reviews)
Beckenham 020 3920 9617

All Well Property Services is a builder serving Beckenham and the surrounding south-east London area. The firm takes on general building work for domestic properties, from structural alterations and extensions to repairs and refurbishment.

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2
EAR Rendering Solution & Insulation
Not Verified
★★★★★ 5.0 (33 reviews)
Beckenham 07311 459056

EAR Rendering Solution & Insulation is a building contractor based in Beckenham, working on exterior rendering and insulation for properties across the area. The two trades are closely linked, since a new render finish is often applied over insulation to improve how a house holds heat.

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3
DeftMen Ltd
Not Verified
★★★★★ 5.0 (25 reviews)
Beckenham 07365 313278

Building work in Beckenham and the surrounding parts of south-east London is the focus of DeftMen Ltd, a local firm taking on the kind of projects the trade covers, from extensions and refurbishments to general repairs. Its details and enquiry route are on its website.

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4
B&S Underpinning Basements
Not Verified
★★★★★ 5.0 (11 reviews)
Beckenham 07418 351278

B&S Underpinning Basements is a building firm based in Beckenham, working on structural projects that involve the ground beneath a property. Underpinning and basement work sit at the core of what it does, covering the foundations that hold a house steady.

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5
Landmark Construction Ltd
Not Verified
★★★★★ 5.0 (4 reviews)
Beckenham 07789 375210

Much of the housing around Beckenham is Victorian and Edwardian stock, and Landmark Construction Ltd works on that kind of property, from extensions and loft conversions to structural alterations and refurbishment. The firm is a general builder based in the town, taking on projects that need planning, building control and several trades coordinated under one contractor. Details of its work and how to arrange a quotation are on its website.

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6
Glenn Miller Builders Limited
Not Verified
★★★★★ 5.0 (4 reviews)
Beckenham 07956 123410

Residential and commercial building work in Beckenham is the focus for Glenn Miller Builders Limited. The company covers construction and general building contracts, working across the local area and surrounding neighbourhoods. More detail on their services and current projects is available at gmbltd.co.uk.

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7
Maxfort LTD
Not Verified
★★★★☆ 4.4 (7 reviews)
Beckenham 07949 814170

Maxfort LTD is a building contractor serving Beckenham and the surrounding south-east London area. Prospective clients can check the firm's website for the scope of work it takes on, from extensions to general building projects.

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8
Cromarty Construction Limited
Not Verified
★★★★★ 5.0 (1 reviews)
Beckenham 07956 987819

General building work across Beckenham and the surrounding area is the focus for Cromarty Construction Limited. The company takes on residential and commercial projects, covering the range of work typically expected from a local builder for homeowners and businesses across this part of south-east London.

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9
Rutland Building Ltd
Not Verified
☆☆☆☆☆ No reviews yet New
Beckenham 020 8249 8769

Building work across Beckenham and the surrounding area is the focus for Rutland Building Ltd, a contractor taking on residential and commercial construction projects, including local builds, extensions and structural work. Straightforward in its scope, it offers the kind of general building services that homeowners and small developers in south-east London regularly require.

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Transparency notice: Recommended and Featured listings are paid placements, so a business's fee affects whether and where it appears. All other listings are ranked by a combined score drawn from ratings and review counts published on third-party business listings, plus basic completeness signals such as a working website and phone. A Trust Verified badge means we have independently checked that business's documents; businesses without it have not been independently verified by us. How we verify →

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Frequently Asked Questions

How much does a builders cost in Beckenham?
It depends on the job, but as a rough guide, a single-storey rear extension in Beckenham usually runs from about £2,000 to £3,000 per square metre, so a 20 square metre kitchen extension often lands between £40,000 and £60,000 before fit-out. A rear dormer loft conversion typically costs £45,000 to £70,000. Smaller jobs are often priced by the day, with a general builder charging around £200 to £300 a day and labourers less. Price swings come down to spec, access, ground conditions (clay and nearby trees can mean deeper foundations), and whether you need structural steel. Getting two or three itemised quotes is normal and worth doing.
Do I need planning permission for an extension or loft conversion in Beckenham?
Many rear extensions and loft conversions fall under permitted development, but not all. Properties in conservation areas, such as parts of Beckenham's older streets, have tighter limits, and flats and maisonettes don't get permitted development rights for most extensions. Bromley Council's planning team can confirm what applies to your postcode. Even when planning isn't needed, building regulations approval usually is, so ask your builder who handles it. A lawful development certificate is a sensible bit of paper if you plan to sell later.
What is the party wall process and who deals with it?
If your work touches or sits close to a shared wall, or involves digging near a neighbour's foundations, the Party Wall etc. Act applies. You must serve notice on your neighbours, usually at least two months before work starts for a party structure. If they dissent, surveyors get involved, and you typically pay for them. Some builders will coordinate this, but the legal duty sits with you as the building owner. Many Beckenham semis and terraces share walls, so raise it early.
How long does a typical building project take?
A single-storey rear extension usually takes 12 to 20 weeks on site once groundworks begin, with design, drawings and approvals adding a few months beforehand. A loft conversion with a dormer tends to be 8 to 12 weeks. Smaller jobs like knocking through a wall and fitting a steel can be done in a week or two. Weather, steel lead times and discovering something unexpected in an older property are the usual causes of delay. Ask for a written programme with milestones.
Should I pay a deposit to a builder?
Be wary of large upfront payments. For bigger jobs, a modest deposit to cover initial materials is common, but the rest should be tied to completed stages, such as foundations, roof on, first fix and completion. Keep a written payment schedule in the contract. Avoid paying in cash with no paperwork, and hold back a final payment until snagging is done and any certificates, such as building control sign-off, are in your hands.
How do I check a builder is reliable before hiring?
Start with the paperwork. Ask for proof of public liability insurance and check the cover amount suits your project. Ask whether they hold relevant trade accreditation and verify it directly with the scheme. Look up their company details if they trade as a limited company. Read online reviews for specifics, ask for addresses of recent local jobs you can visit, and speak to a past client if you can. Get a written, itemised quote and a contract before any work starts. If a business isn't marked Trust Verified, we haven't done these checks for you, so do them yourself.