£500–£3,000 for small structural work, £15,000–£80,000+ for extensions and conversions
Pricing varies by property type, service requirements, and location. Always compare at least 3 like-for-like quotes before appointing.
Typical timeline: 2–4 weeks for small projects, 3–6 months for extensions and conversions
Check for a proven track record with similar-scale projects in your area
Ask for references and visit completed projects where possible
Confirm they carry public liability insurance (minimum £2 million)
Verify they understand local building regulations and planning requirements
Get a detailed written quotation with a fixed timeline and payment schedule
Emergency callouts, evening/weekend visits, and urgent parts sourcing usually increase rates. If your job is non-urgent, planning ahead and combining smaller tasks into one visit often reduces total spend.
Explore local cost context before requesting quotes.
Many single-storey rear extensions fall under permitted development rights. However, if your property is in a conservation area, is listed, or the extension exceeds size limits, you will need planning permission. Always check with your local planning authority before starting work.
Look for verified customer reviews, proof of public liability insurance, membership of trade bodies like the FMB or NHBC, and ask to see examples of completed projects. A reliable builder will provide a detailed written quotation and a realistic timeline.
Builders handle the above-ground structure — walls, roofs, and finishes. Groundworkers prepare the site, dig foundations, install drainage, and lay services. Many extension or new build projects require both.
A typical loft conversion takes 6–10 weeks depending on the type (Velux, dormer, or mansard). The structural work takes 2–3 weeks, followed by plastering, electrics, plumbing, and finishing.
Compare nearby categories before choosing your final quote shortlist.