✓ Verified Google reviews·✓ Reviewed regularly·✓ Updated 31 August 2026
Written by Mark Reid,
Trades Editor ·Verified 31 August 2026
High Wycombe's housing stock is a mixed bag, and that shapes the kind of builder you'll need. You've got Victorian terraces around Desborough and West Wycombe Road, 1930s semis out towards Hazlemere and Downley, and newer estates near Cressex and Booker Common. Loft conversions are popular in the older streets where extending outwards just isn't possible, while the Chiltern-fringe villages like Hughenden and Great Kingshill often need work sympathetic to older stone and flint construction. Chalk subsoil across parts of the district also means groundworks and foundations need proper attention, so local experience with the area's ground conditions counts for a lot.
The builders featured here are pulled from public business listings and ranked mainly by review rating and how many reviews they've built up, with a small boost given to those showing a working website and phone number. We then check each business's homepage to confirm building work is genuinely their main trade rather than something they dabble in, which keeps roofers, electricians and general handymen off a list meant for builders. Any listing flagged as permanently closed gets removed automatically, so what you see should reflect businesses still trading. Where a business carries a Trust Verified badge, it's gone further and 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 sets out exactly what that involves). Businesses without that badge haven't been through that process with us, so it's worth doing your own checks before you commit.
Before signing anything, ask to see a written quote that breaks down labour, materials and any allowance for skip hire or waste disposal. Confirm whether they're Gas Safe registered if boiler or heating work is involved, and ask for proof of public liability insurance, ideally at least £2 million cover. For anything structural, like removing a wall or building an extension, check they'll handle building regulations sign-off and, where needed, party wall agreements with neighbours. It's sensible to get two or three quotes rather than accepting the first one, since prices for the same job can vary by a few thousand pounds depending on how busy a builder is and what materials they're specifying. Ask for recent local references too, ideally jobs within a few miles, so you can see finished work with your own eyes.
How We Select & Rate The Best Builders in High Wycombe
Ranking is driven mainly by review rating and review count from public business listings, with a small lift for businesses showing a working website and phone number. We check each business's homepage to confirm building work is what they primarily do, which filters out unrelated trades. Listings flagged as permanently closed are removed automatically. Businesses marked Trust Verified have gone further, passing our full verification covering trade qualifications and accreditations, public liability insurance, trading history, customer review history and registered company information; see our How We Verify page for the complete list. Other businesses on this page haven't been independently verified by us, and being listed isn't an endorsement. Always do your own checks before hiring anyone.
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 →
Loft conversions and house extensions form the core of Unique Home's work in High Wycombe, covering everything from structural alterations to finishing touches. The firm holds a 5 star rating from 22 reviews, reflecting consistency across projects that often involve reconfiguring existing layouts rather than simple cosmetic updates.
Rated 5.0 across 12 Google reviews, Daniel Restoration Ltd is a building firm based in High Wycombe with a consistent record of customer satisfaction. The company undertakes restoration and general building work for residential clients in the local area. Twelve reviews all awarding full marks points to reliable, repeatable standards rather than a one-off result.
A 4.6 rating from 18 reviews points to consistent workmanship at Ramcrete Concrete Pumping Ltd, based in High Wycombe. The firm handles concrete pumping for building projects across the area, working with builders and contractors who need material delivered efficiently on site. Its focus stays narrow, concentrating on pumping rather than broader construction work.
Rated 5.0 on Google across nine reviews, Iwanski Design Co Ltd is a building firm based in High Wycombe, HP11 1TY. The company combines design and construction under one roof, handling projects from initial concept through to completed build. Its dual focus on design and delivery sets it apart from more conventional building contractors in the area.
Residential and commercial clients in High Wycombe turn to Elite Property Projects for building and construction work across the local area. The company holds a 4.6 rating from customer reviews, reflecting consistent delivery on general build projects. HP13 6PF places them well for work throughout the town and surrounding Buckinghamshire areas.
Landlords and letting agents in High Wycombe looking to add value to rental properties make up a good share of CZP Loft Conversions' work, alongside general loft conversion projects. The firm holds a five-star rating from eight reviews, reflecting consistent standards on smaller, tightly managed jobs where minimal disruption matters to tenants.
Covering new builds, extensions, and landscaping work from a single contractor, 101 Construction & Landscaping Ltd operates across High Wycombe and the surrounding area. The company handles both structural building projects and outdoor spaces, removing the need to coordinate separate trades. Clients can review the firm's portfolio and scope of work through its website.
General building work in High Wycombe covers everything from extensions to renovations and repairs. LJJ Ltd works with domestic and commercial clients across the area, taking on projects from initial groundwork through to finishing touches. Enquiries can be made via the company's website for further details on current availability.
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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Small jobs like patching brickwork or fitting a new door frame might run £300 to £800, while a single-storey extension typically costs £1,800 to £2,800 per square metre depending on finish and access. A loft conversion in a typical Wycombe terrace often comes in between £35,000 and £55,000 once you include a dormer and en suite. Prices swing a lot based on materials, whether scaffolding's needed and how easy the site is to access, so getting two or three written quotes is standard practice rather than an extra step.
Do I need planning permission for an extension in High Wycombe?
Many single-storey rear extensions fall under permitted development if they stay within size limits, but this depends on your property type and whether you're in a conservation area, and parts of High Wycombe including areas near the town centre and West Wycombe do have conservation status. Loft conversions with dormers usually need planning permission if they face a road. Check with Wycombe District Council's planning portal or ask your builder to confirm before work starts, since building without the right permission can cause problems when you come to sell.
How long does a typical extension or loft conversion take?
A single-storey rear extension usually takes eight to twelve weeks from breaking ground to a finished, decorated room, weather and material delivery times permitting. Loft conversions tend to run ten to fourteen weeks, partly because of structural steel work and partly because staircases and en suites add time. Groundworks can slow things down if you hit clay or chalk unexpectedly, which isn't unusual in this part of Buckinghamshire, so build in a bit of contingency when planning around house moves or school terms.
What paperwork should a builder provide before starting work?
Ask for a written contract covering scope of work, payment schedule, start and finish dates, and what happens if there are delays. For structural work you should see a structural engineer's calculations and confirmation of building regulations sign-off. If the job involves a party wall, get written agreement with neighbours sorted beforehand. Also ask for proof of public liability insurance and, if relevant, membership of a trade body like the Federation of Master Builders, since that can matter for warranty and dispute resolution later.
Should I pay a deposit upfront?
A reasonable deposit is typically 10 to 25% of the total job cost, often used to order materials in advance. Be cautious of anyone asking for more than a third upfront or wanting full payment before work begins. Staged payments tied to completed milestones, like first fix, plastering, and final snagging, protect you better than one big payment early on. If a builder pushes hard for a large upfront sum with no clear reason, treat that as a reason to slow down and ask more questions.
How do I choose between builders on a list like this?
Read through recent reviews rather than just the star rating, since patterns in comments about timekeeping, tidiness or communication tell you more than a number alone. Look up the business on Companies House if they're registered, to check how long they've been trading. Ask to see photos of completed jobs similar to yours, ideally local ones, and request contact details for a couple of past customers. Confirm insurance and any trade accreditations directly with the builder rather than assuming, and get everything agreed in writing before work starts.
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