Double Garage Conversions in Preston, Lancashire

Double garage conversion work opens up a genuinely large amount of usable space, and in Preston it tends to belong to two quite different kinds of property. The substantial 1930s detached houses around Fulwood, many built for professional households in what remains one of the city’s more affluent suburbs, often carry double garages added or extended over the years. The newer estates developed at Cottam and Lea Grange since the early 2000s, built to modern two-car household expectations, carry them as standard from the outset.

Which Preston Properties Have Double Garages

Fulwood has been one of Preston’s more substantial residential areas since the interwar period, developed with larger detached and semi-detached housing on generous plots, partly around the presence of Fulwood Barracks and the professional households the area has long attracted. Double garages on these properties vary in construction — some are original to the 1930s build, others added later as a single-storey extension to the side, which means the roof structure and wall construction need checking individually rather than assumed.

The more predictable double garages are the newer ones. Cottam and Lea Grange, developed substantially since the early 2000s as Preston expanded northwest, were built to a standard that assumes most households run two cars, and double garages are correspondingly common across those estates. Construction here is modern and consistent, generally with better original insulation values than anything from the 1930s.

On semi-detached properties with a double garage spanning the boundary line, there is also a party wall question if the dividing structure within the garage is shared with the neighbouring property — worth establishing at survey rather than assuming either way.

Our Double Garage Conversion Process

1. Survey and structural assessment. We check the roof structure over the garage, whether it is original or a later addition, and identify wall construction throughout, including any party wall.
2. Design. A double garage can become one large open room, or be partitioned into two — a home office and a playroom, for example. We design to how you actually want to use the space.
3. Structural work. The door opening, or openings, are infilled, any internal partition is framed, and the floor and walls are damp-proofed and insulated throughout to a standard suited to Lancashire’s rainfall.
4. Fit-out. First-fix electrics across the full span, plastering, flooring, decoration, and matching new external walls to the existing house.

Double Garage Conversion Costs in Preston

A double garage conversion to a single open room typically runs from £15,000 to £22,000 in the Preston area. Partitioning into two separate rooms adds roughly £2,000 to £3,500 for the dividing wall, additional doors and separate electrical circuits. A double garage conversion including a shower room or kitchenette, suited to a self-contained annexe, typically runs £24,000 to £33,000.

Those figures cover door infill, structural work, insulation, electrics, plastering and decoration. They exclude furniture, kitchen fittings beyond first-fix plumbing, and any work to the rest of the house. Whether the garage is original to the house or a later addition is one of the bigger factors affecting price on Fulwood’s older properties specifically.

Frequently Asked Questions

Do I need planning permission?

Usually not, provided the work stays internal and the external appearance changes only modestly. We confirm your specific position before design work starts.

Can I split a double garage into two separate rooms?

Yes, and it is a common choice — a home office and a playroom, or a bedroom and an en suite. The dividing wall and separate services need designing in from the start.

Do I need Building Regulations approval?

Yes, always. A double garage conversion covers more floor area than a single, so getting insulation, ventilation and electrical safety right at design stage matters even more.

How long does the work take?

Four to six weeks for a single open room without plumbing. A partitioned double garage, or one including a shower room, typically runs six to eight weeks.

Areas We Serve

We carry out double garage conversions across Preston and the surrounding area, including Leyland, Chorley, Penwortham, Bamber Bridge and Fulwood.

Where a smaller conversion is a better fit, we also carry out single garage conversions, home office conversions, bedroom conversions and partial garage conversions.

Guidance on structural work and party wall matters for shared walls is published by the Federation of Master Builders.