Loft Conversions in Leatherhead.
Loft conversions in Leatherhead and Fetcham add a bedroom or study within the roof, whether on an early-1900s house near the centre, an inter-war house at Givons Grove or a post-war home to the north. The roof shape decides the approach: rooflights where there is enough height, a dormer for more headroom, or a hip-to-gable change on a hipped roof. Rooflight, dormer and hip-to-gable conversions usually take 6 to 10 weeks on site; a mansard takes longer, 10 to 14 weeks.
Read our loft conversion cost guideRequest Your Free Cost Proposal
Tell us about your Leatherhead project. We reply within 24 hours to arrange a free site visit, then send an itemised Cost Proposal.
Our focus in Leatherhead.
Mole Valley's Design Guidance for House Extensions SPD (2025) includes loft conversions among its topics, and the Leatherhead Design Code or Bookham & Fetcham Design Code applies to householder applications. In the Leatherhead and Fetcham conservation areas, dormers and hip-to-gable conversions are not Permitted Development, so they need a planning application, while rooflights can often still be added without one. Article 4 controls in parts of the Leatherhead conservation area may add further limits, so the direction is checked for houses there. On a house outside the conservation areas, a rear dormer within the volume limits may not need an application at all. Your roof's planning route is confirmed at the start, ahead of design.
As a design-and-build company we take on a limited number of projects at a time, so that every one gets the attention it deserves. If you are planning work on your Leatherhead home, we would like to hear about it.
The Grand Standard
- 10% deposit, then weekly billing for completed work
- One team from design to completion
- Planning & building control managed for you
How far we are
8 miles
from our base in New Haw, measured in a straight line.
Planning in Leatherhead
Homes in Leatherhead fall under Mole Valley District Council (opens the council's website in a new tab). Its conservation areas here include Leatherhead and Fetcham.
We confirm the route for your house (Permitted Development, prior approval or a planning application) before you commit.
Our nearest finished project
Building in Leatherhead
Every service we offer in Leatherhead, its planning authority and nearby towns, on one page.
More about building in LeatherheadLocal housing stock
Early 1900s houses near the centre · Inter-war houses at Givons Grove · Post-war homes north of the centre · Detached houses in Fetcham
What we deliver in Leatherhead.
- 01
Dormer
Extends outward from the existing roof slope to add valuable headroom and floor space: the most versatile option for most homes.
- 02
Mansard
Rebuilds one slope of the roof to near-vertical, creating a full extra storey and the most usable internal space.
- 03
Hip-to-Gable
Extends the sloping side of a hipped roof into a vertical gable wall, unlocking width on semi-detached and detached homes.
- 04
Velux / Rooflight
Keeps the existing roofline and adds flush rooflights: the most cost-effective conversion where headroom already exists.
- 05
En-suite Additions
A private shower room or bathroom built into the new floor, with all plumbing and waterproofing handled in-house.
- 06
Bespoke Staircases
A made-to-measure staircase that meets building regulations for headroom, pitch and fire safety while suiting your home's style.
Your questions, answered.
Your Cost Proposal
Measured first, then itemised.
Every Leatherhead project begins with a free consultation and a fully itemised Cost Proposal. We take a 10% deposit three weeks before the start date, then bill weekly for completed, signed-off work.
Read our loft conversion cost guideTransform your Leatherhead home.
Tell us about your Leatherhead project and we'll arrange a free, no-obligation consultation, followed by a clear, itemised Cost Proposal, usually within 24 hours.
“Grand Innovations carried out our loft conversion and the experience was far smoother than expected for such a complex project. Conor was hands-on, knowledgeable, and always available when decisions needed to be made. The build quality is excellent. The stairs, insulation, carpentry, and finishes all feel high-end and carefully completed. What impressed us most was how well the different trades were managed and how much attention was paid to detail. The space now feels like it was always part of the house. A very professional team that takes real pride in their work.”