In short: A general builder in Buckinghamshire typically costs £280–£450 per day or £40–£55 per hour, above the national average because of South East labour costs. A single storey extension runs £1,800–£3,000 per m² nationally, with real Buckinghamshire quotes starting from around £53,080 for a modest side or rear extension. A loft conversion in Buckinghamshire averages around £36,990, and a kitchen extension typically costs £38,000–£70,000 for a 20m² project including fittings. Always get at least three quotes and confirm whether VAT is included.
Builders in Aylesbury and Buckinghamshire to browse
If you need a builder quoted, these are the relevant directory categories to browse:
- Builders – general builders, construction companies and building contractors for renovations, refurbishments and new builds
- Home Extensions – specialists in single and double storey extensions, kitchen extensions and side returns
- Loft Conversions – dormer, hip-to-gable and mansard conversion specialists
- Kitchen & Bathroom Fitters – for the fit-out once the structural work is done
- Carpenters & Joiners
- Handyman Services – for smaller jobs that don’t need a full building team
How much does hiring a builder cost in Buckinghamshire?
What you pay depends on whether you need a day-rate builder for general work, or a fixed-price quote for a defined project like an extension or loft conversion. The figures below are national UK ranges from independent cost-guide sources, cross-checked against real Buckinghamshire job data where available. Treat them as a starting point for comparing quotes, not a fixed price.
- General builder day rate: £280–£450 in Buckinghamshire (South East rates run above the national average of roughly £250–£290/day)
- Hourly rate: £39–£43 in nearby towns such as High Wycombe, Chesham and Gerrards Cross
- Small job or handyman-scale work: £500–£2,000, e.g. a stud wall, minor repairs or a small brickwork job
- Single storey extension: £1,800–£3,000/m² nationally; real Buckinghamshire quotes start from £53,080 for a modest side or rear extension
- Kitchen extension (around 20m²): £38,000–£70,000 including building work and kitchen fittings
- Loft conversion: averages £36,990 in Buckinghamshire, ranging £32,850–£47,325 depending on type; dormer and hip-to-gable conversions typically cost more than a basic rooflight conversion
- Double storey extension: £70,000–£120,000+, since it roughly doubles the floor area for a similar footprint of groundworks
Sources: MyJobQuote, single storey extension cost guide, hamuch.com, single storey extension cost data for Buckinghamshire and hamuch.com, loft conversion cost data for Buckinghamshire.
Real Buckinghamshire prices
These figures come from real Buckinghamshire quotes and job data rather than national averages:
- Single storey extension: quotes from local builders start around £53,080, rising to £61,000+ depending on size and finish
- Loft conversion average: £36,990, with a range of £32,850–£47,325
- Mansard loft conversion: around £52,346, the most expensive loft conversion type
- Dormer or hip-to-gable loft conversion: around £42,346
- Hourly labour rates nearby: High Wycombe £39/hr (£272/day), Gerrards Cross £43/hr (£282/day), Chesham £42/hr (£277/day)
Source: hamuch.com, Buckinghamshire single storey extension quotes and hamuch.com, Buckinghamshire loft conversion cost data.
What determines the cost of a building project
Two extensions of the same size can end up thousands of pounds apart once you account for the following:
- Structural complexity – removing a load-bearing wall, underpinning, or building close to a boundary all add engineering and labour cost that a straightforward rear extension doesn’t carry
- Groundworks and access – a sloping garden, poor site access for materials, or the need to dig deep foundations near existing drains all push the price up before any brick is laid
- Specification level – basic builds sit at the lower end of the per-m² range, while bi-fold doors, roof lanterns and underfloor heating push a build toward the premium end
- Planning permission and Building Regulations – most single storey rear extensions fall under permitted development, but larger builds, side extensions, or work on a listed building need planning permission, which adds time and sometimes design cost
- VAT – most builder quotes are given excluding VAT, so confirm this before comparing two quotes that look close but aren’t priced the same way
Builder quote red flags
The same red flags that apply to roofing quotes apply to any building work:
- A quote given over the phone or from a photo, with no site visit, for anything beyond a very small job
- A large deposit requested upfront, especially in cash, before any work or materials have been ordered
- No written contract or schedule of works, just a verbal agreement on price
- Reluctance to provide references from recent, similar local jobs, or to confirm public liability insurance and membership of a trade body such as the Federation of Master Builders
- A price that seems well below every other quote you’ve had, with no clear reason for the gap
For the full checklist on spotting inflated or misleading trade quotes generally, see 10 Roofing Quote Red Flags in Buckinghamshire, most of which apply equally to builders.
How to choose a builder in Aylesbury
- Get at least three quotes for anything beyond a small repair, and make sure each one covers the same scope of work so you’re comparing like for like
- Check trade body membership, such as the Federation of Master Builders (FMB) or TrustMark, which involves some vetting before a builder can join
- Ask for public liability insurance and, for structural work, confirm they’ll use a Building Regulations-registered process or a competent person scheme where relevant
- Ask to see recent, similar local work, ideally in person rather than just photos, and speak to a previous customer if you can
- Agree payment stages in writing tied to project milestones, rather than a single large payment upfront
Related guides
If your project involves the roof, see How Much Does a New Roof Cost in the UK? or 10 Roofing Quote Red Flags in Buckinghamshire. For guttering and fascia work that often comes up alongside extensions, see Guttering & Fascia Replacement Cost.
How much does it cost to hire a builder in Buckinghamshire?
Most general builders in Buckinghamshire charge £280–£450 per day, or £39–£43 per hour, which is above the national average because of South East labour costs. For a defined project like an extension, you’ll usually get a fixed-price quote instead of a day rate, based on the size and specification of the job.
How much does a house extension cost in Buckinghamshire?
A single storey extension typically starts from around £53,080 for a modest side or rear extension, based on real Buckinghamshire builder quotes. Nationally, single storey extensions cost £1,800–£3,000 per m², so a 20m² extension usually lands between £30,000 and £55,000 depending on specification. Double storey extensions cost more, typically £70,000–£120,000+.
Do I need planning permission for an extension in Aylesbury Vale?
Many single storey rear extensions fall under permitted development rights and don’t need planning permission, provided they stay within size and height limits. Side extensions, larger rear extensions, work on a listed building, or anything that affects a neighbour’s light or boundary usually does need permission. Check with Buckinghamshire Council’s planning department before committing to a design, since rules can change and some areas carry extra restrictions.
How long does a typical extension take to build?
A single storey extension typically takes 3 to 4 months from groundworks to a finished, decorated space, though this varies with size, weather, and how quickly materials and trades can be scheduled. A loft conversion usually takes 6 to 8 weeks. Larger or more structurally complex projects, such as a double storey extension, can take 4 to 6 months.
Should I use a sole trader builder or a building company?
A sole trader or small local team can often be more cost-effective for smaller jobs and gives you direct contact with the person doing the work. A larger building company usually has more capacity to run bigger or more complex projects in parallel with other trades, and may carry more robust insurance and project management. For a straightforward extension or loft conversion, either can work well, so weigh this against references, insurance and trade body membership rather than size alone.