How long does a garage conversion in Egham take?

Most single garage conversions run three to five weeks on site once building control and any consents are in place. A double garage, or a conversion needing significant structural work such as a wide opening into the house, takes longer, usually five to eight weeks. We set out the programme week by week before work begins.

Will the new floor be noticeably higher than the garage floor was?

Yes, and that is the intention. The finished floor is brought up to run flush with the rest of the ground floor, so there is no step between the new room and the house. The build-up carries the insulation and the damp-proof membrane, which is why it is not simply a matter of laying a new surface over the existing slab.

How much does a garage conversion cost in Egham?

It depends on the condition of the structure, the extent of the floor build-up, whether the frontage is being infilled and whether the room needs plumbing. Rather than publish a range that may not fit your garage, we visit, measure and put a single itemised figure in writing. Our published garage conversion cost guide explains where the money goes.

Design and build · Surrey

Garage Conversions
in Egham

Garage conversions in Egham, designed and built by one team from our base in New Haw, about 6 miles away.

Get a free Cost Proposal 01932 950158

FMB membersSee our reviews on Google Read our garage conversion cost guide

Our workGarage conversion, Epsom, Surrey

3 to 5 weeks
on site for a single garage conversion
Runnymede
Borough Council decides planning
Typical homes
Modern family homes
6 miles
from our base in New Haw

Building in Egham

What shapes a garage conversion here

Garage conversions in Egham

Converting a garage in Egham raises one question that does not arise in most of Surrey, and it is worth addressing before anything else. Parts of Egham, Englefield Green and the land running down towards the Thames sit within the flood plain, and a garage is frequently the lowest floor level on the plot. It was built that way deliberately: a garage is not habitable space, so a slab that sits low and falls towards the door is entirely sensible.

Turning that space into a habitable room changes what the floor has to do. The level has to come up to meet the house, the construction has to account for the property's flood position, and the materials used at low level should be chosen with that in mind. None of this makes a conversion in Egham a bad idea, as it remains the least disruptive way of gaining a real room, but it does mean the floor deserves more thought here than it does elsewhere, and we would rather raise it at the first visit than after the work has started.

What we build

Garage conversions we design and build

Garage conversions

Floor Level & Build-Up
The garage slab typically sits below the house floor and falls towards the door. We build the floor up to run flush with the rest of the ground floor, incorporating insulation and a damp-proof membrane within that build-up rather than treating the level change as a finishing detail.
Flood Position & Materials
Where a property sits in a flood risk area, the sensible approach is to specify the lower part of the construction accordingly and to keep electrical outlets and vulnerable services above the likely level. We check the property's flood position as part of the first visit so the design accounts for it from the outset.
Insulation & Damp-Proofing
Garage walls are not built to habitable standards, and a low, riverside floor makes the damp-proofing more important rather than less. We insulate and damp-proof the full envelope so the finished room stays warm and dry through the winter.
Frontage & Building Control
We infill the old opening and match the brickwork and detailing to the existing elevation, and every stage is inspected and signed off by building control. Runnymede Borough Council is dealt with on your behalf, including any application required.

Our nearest finished garage conversion

Epsom Garage Conversion

Epsom, Surrey · about 14 miles from Egham

The brief

Integrating the existing, lower-level garage slab with the main house floor level while ensuring maximum ceiling height for the new living space.

What we built

We engineered a stepped foundation and structural raised floor that perfectly matched the home's interior levels, creating an invisible, flush threshold between the original and new spaces.

View this project

Garage conversion FAQs

Questions we get asked here

Straight answers on garage conversions in Egham.

In many cases yes, but the flood position should inform the design rather than be discovered afterwards. Converting a garage changes a non-habitable space into a habitable one, and where a property sits in a flood risk area that can affect what is required. We check the position for your specific address at the first visit and set out plainly what it means for the work.

Converting an attached or integral garage often falls within Permitted Development, because the footprint of the building does not change. Permission may still be required where the property is in a conservation area, where permitted development rights have been removed, or where the flood position or the frontage alteration brings other considerations into play. We confirm the position with Runnymede Borough Council before starting.

Free Cost Proposal

Planning a garage conversion in Egham?

Tell us about the project. We'll arrange a free site visit, then send a clear, itemised Cost Proposal.

10% deposit, due three weeks before the start date
Weekly billing for completed, signed-off work
One team from first drawings to completion

Rather talk it through? 01932 950158

“Very helpful, proactive and competitive design/build quote. The initial video consultation was very useful, and Conor was very proactive in following up on my questions. The detailed cost breakdown was very helpful in understanding where I could perhaps reduce costs. If you are looking for a design and build company to discuss your project, I have no hesitation in recommending Conor and the Grand Innovations team.”

Ravensbourne · Design/build cost proposal · via Trustpilot

Garage Conversions in Egham

What shapes a garage conversion here

Garage conversions in Egham

Garage conversions we design and build

Floor Level & Build-Up

Flood Position & Materials

Insulation & Damp-Proofing

Frontage & Building Control