How much does a loft conversion cost in the UK?

Most UK loft conversions cost between £35,000 and £75,000. Velux conversions start around £25,000. Mansards on period properties can reach £90,000. London prices typically run 25–40% above the rest of the UK.

How long does a loft conversion take?

Typical UK loft conversions take 8 to 12 weeks of on-site build time, plus 4 to 8 weeks before that for design, planning and structural sign-off. Most homeowners are in their new loft 14 to 20 weeks from first call.

Do I need planning permission for a loft conversion?

Most dormer and Velux conversions qualify as permitted development, so no planning is needed. Mansards, large dormers, and conservation-area conversions usually require planning. We handle the application if needed.

Will I need to move out during the build?

Most clients stay in their home throughout the build. The work is contained to the loft and the stairwell entry point. There is mess during the structural and stair-cut weeks (2 to 3 weeks of the build), then internal finishing.

What guarantees do you offer?

You get a written 10-year structural guarantee, insurance-backed. All work is signed off under building regulations. Materials carry their own manufacturer warranties.

Do you cover my area?

We currently cover Leeds and West Yorkshire (LS, BD, WF, HD postcodes). We are expanding across the UK throughout 2026. Tell us your postcode and we will confirm coverage within an hour.

UK Loft Conversion

0800 XXX XXXX

Victorian terraced house in the UK with a completed grey zinc dormer loft conversion

Loft conversions across the UK

Add a beautiful room, not the stress of moving.

Fixed-price quotes within 5 working days. Free home survey. 10-year structural guarantee.

Or call 0800 XXX XXXX

★★★★★ 4.8/5 · 184 reviews

10-year guarantee

Quote in 5 days

★4.8/5 across 184 reviews
Quote within 5 working days
10-year structural guarantee
Fixed-price, no surprises
Insured + FMB accredited

— Before & after

See what your loft
could become.

Real loft transformations from our recent work. Drag the slider to see the same property before and after.

Unconverted loft before conversion: exposed joists, dusty, unused

After

Before

Empty loft to master bedroom suite

Three-bed Victorian terrace · Dormer with ensuite · 10 weeks build · £42,000

Before

After

Edwardian terrace · Dormer

Two bedrooms + family bathroom · 9 weeks · £48,500

Before

After

1930s semi · Hip-to-gable

Master bedroom + walk-in wardrobe · 11 weeks · £56,000

Before

After

Victorian townhouse · Mansard

Master suite + study + ensuite · 16 weeks · £78,000

— How a conversion happens

From first call to moving in:
four calm steps.

One project manager. One fixed price. One ten-year guarantee. We take care of design, planning, building regulations, and the build.

Takes 60 seconds · No obligation · We never share your details

5 days

From survey to written quote

10 yrs

Insurance-backed structural guarantee

20–25 %

Average value added to your home

£0

Deposit before work starts

— Four types, one survey

It is hard to know which loft
conversion fits your home.

We work out what your roof type allows during the free home survey. Most UK homes can take a dormer or a Velux — the most popular two options.

Dormer Loft Conversion

From £35,000 →

Extends out from the roof to add full standing headroom. Works on almost any terrace, semi or detached. Usually does not need planning permission.

Bright loft conversion bedroom with Velux roof windows letting in daylight

Velux / Rooflight

From £25,000

Simplest and cheapest. No structural change. Great when you already have head height.

Hip-to-Gable

From £45,000

For semis and detached with hipped roofs. Maximises usable space.

Also available

Mansard Loft Conversion

From £55,000 · Planning permission usually required

The most space you can add. Rebuilds the entire roof slope into a near-vertical wall. Best for Victorian and Edwardian terraces and townhouses.

— Sarah, two kids, Leeds LS6

"We had a fixed-price quote in four days and they actually stuck to it. No surprise extras when we hit the structural week. Best contractor decision we have made."

★★★★★

Dormer conversion + ensuite · Three-bed Victorian terrace · January 2026

"They handled the planning application themselves. We did not have to chase Leeds council once. Build came in £350 under quote."

James & Anna · Bradford BD3 · Hip-to-gable + bedroom + bathroom

"We stayed in the house the whole 11 weeks. Daily cleanup, one point of contact, no nasty surprises. We have already recommended them to neighbours."

Mark · Wakefield WF1 · Dormer with double bedroom

4.8

Average rating

184

Verified reviews

96 %

Would recommend

— Why choose us

Six promises we put
in writing.

— Before you book

Common questions.

Ready to see what is possible in your loft?

Free home survey. Fixed-price written quote within 5 working days. No deposit until work starts.

Or call 0800 XXX XXXX

No card. No commitment. You can always say no thanks.

Call

Add a beautiful room, not the stress of moving.