Loft conversion specialists near me: how to choose one in 2026 (UK)
A loft conversion is one of the highest-value improvements you can make to a UK home, but it is also structurally serious: new floor joists, steel beams and staircases all have to be designed and signed off. There is no honest national ranking of “best loft companies” — what protects you is a set of checks. Is the firm registered with a recognised scheme, do they work to a proper structural engineer’s design, will they handle Building Regulations sign-off, and do they quote a fixed price in writing? Get those right and the specific company matters far less than the process. This guide shows you what to verify and what a fair 2026 price looks like.
- Check registration: FMB (Federation of Master Builders) and TrustMark, backed by a chartered structural engineer
- Typical 2026 rate: £40,000–£75,000 for a dormer loft conversion
- Always compare: three written quotes, like for like
Get 3 Free Loft Conversion Quotes
Tell us what needs doing and we will match you with vetted local loft conversion specialists who can quote on the actual job.
- ✓ Registered, insured tradespeople
- ✓ Compare three prices side by side
- ✓ Free, no-obligation quotes
Why we do not publish a “top 10 loft companies” list
Every loft is different. Roof pitch, head height, the position of the water tank and how the staircase can land all change what is possible and what it costs. A firm that excels at rear dormers on Victorian terraces might be the wrong choice for a hip-to-gable on a 1930s semi. A fixed national list cannot see any of that, and it cannot tell whether a company is quietly overbooked this season.
So we teach the method rather than sell a list. Verify the credentials, insist on a structural design, compare three real quotes and watch how each firm behaves at the quoting stage. That process works in any town and on any roof.
The accreditations that actually matter
Loft conversions are not a licensed trade, so anyone can advertise the service. Voluntary schemes are therefore your main filter, and for lofts the structural side carries extra weight because the work changes how your roof and floors carry load.
Verify the card, not the logo
Do not trust a badge on a brochure. Ask for the firm’s FMB or TrustMark number and check it on the official online register, and ask to see the structural engineer’s calculations. The company name on the register must match the name on your contract.
What loft conversion specialists charge in 2026
Loft prices are usually quoted per conversion type rather than per square metre, because the roof structure dictates so much of the work. Below are realistic 2026 figures excluding VAT, fit-out extras and any planning fees.
For a full breakdown see our cost guides.
How to compare quotes without comparing apples and oranges
Loft quotes vary wildly because firms quietly include or exclude big-ticket items — the staircase, the en-suite, the steelwork, making good the rooms below. Level the playing field before you compare numbers.
- Insist on it in writing. A verbal figure is an opinion, not a quote
- Check labour and materials are split out. Steelwork and staircases are big line items
- Ask whether it is a quote or an estimate. You want a fixed price, not a moving target
- Confirm VAT. Is it included, and is the firm VAT-registered?
- Confirm what “finished” means. Plastered and decorated, or a bare shell? Is the en-suite included?
Questions worth asking before you book
About the business
Are you FMB or TrustMark registered, and what is your membership number? Who provides your structural warranty? Can I see two recent conversions and speak to those owners? Are you VAT-registered and what insurance do you carry?
About the job
Will you work to a structural engineer’s design? Do I need planning permission or does this fall under permitted development? Will you manage the Building Control inspections? Where will the staircase land, and how much head height will I actually get?
Red flags to walk away from
- Cash only, no paperwork. No contract means no comeback on a five-figure job
- Large deposit up front. Stage payments tied to completed work are normal; a big cash lump before anything starts is not
- Pressure to decide today. A real quote is not a one-day offer
- No structural engineer involved. If a firm says a loft needs no calculations, walk away — it always does
Building Regulations are non-negotiable on a loft
Whether or not your loft needs planning permission (many are permitted development), it will always need Building Regulations approval. This covers the strength of the new floor, the fire escape route and protected staircase, insulation, and head height on the stairs. A proper loft specialist arranges Building Control inspections at each key stage and hands you a completion certificate at the end — the document your solicitor will demand when you eventually sell.
Ask exactly who is handling that sign-off and insist on seeing the final certificate. A local firm that regularly works with your council’s Building Control team can be smoother than a distant national brand, but company size is not the point — the paperwork trail is. Without a completion certificate, a loft conversion can become a serious headache at resale, so treat it as central to the job, not an afterthought.
FAQs: finding a good loft conversion specialist in the UK (2026)
How much does a loft conversion cost in 2026?
A simple rooflight conversion typically costs £28,000–£42,000 in the regions, a dormer £42,000–£62,000, and a hip-to-gable or L-shaped dormer £55,000–£78,000. London and the South East run 25–40% higher. Figures exclude VAT and design fees.
Do I need planning permission for a loft conversion?
Many loft conversions fall under permitted development and need no planning permission, but dormers on the front elevation, conservation areas and volume limits can change that. Every loft, however, needs Building Regulations approval regardless of planning status.
What accreditation should a loft conversion company have?
Look for FMB and TrustMark membership plus a 10-year structural warranty, and make sure the work is built to a chartered structural engineer’s design. Verify all membership numbers on the official registers before signing.
Do I need a structural engineer for a loft conversion?
Yes. A loft conversion adds a new load-bearing floor and usually steel beams, so it must be designed and signed off by a chartered structural engineer. Any firm that tells you calculations are not needed should be avoided.
How long does a loft conversion take?
A typical dormer conversion takes around 6–10 weeks on site once work begins, though design, planning and Building Control lead time adds weeks or months before that. Complex hip-to-gable jobs can run longer, so ask for a stage-by-stage programme.
How do I compare loft conversion quotes fairly?
Make sure every firm is pricing the same finished result: same layout, whether the en-suite and staircase are included, and whether rooms are decorated or left as a shell. Get it in writing, check the steelwork and staircase are itemised, and confirm VAT.
Compare real loft conversion specialists, on your actual loft
Forget the fake “best of” lists. Tell us about your loft and we will match you with vetted local specialists who can quote on your real roof, so you can compare three prices side by side.