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modern timber clad garden room large sliding glass doors dark fascia paved approach

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Glenrothes flat roof extensions from £3,000 per square metre

Clear budgeting for each stage of construction. Bifold doors and rooflights planned around your space. Coordinated trades for a fully finished extension.

Open your main living space towards the garden

A rear flat roof extension can turn a tight kitchen or divided living area into a broad room with a clear view outside. We've completed this format frequently, including designs with bifold doors that open a wide section of wall to the garden. The footprint can accommodate cooking, dining and seating without forcing every activity into the same narrow strip. We consider the transition from the existing house, the balance between glazing and usable walls, and how rooflights could bring daylight deeper into the original room.

Utility room with laundry appliances and dark cabinets

In Detail

Understand what the first build stage covers

We progress from groundworks and structure to the wind-and-watertight shell, then into insulation, services and the internal finish where required. Around £3,000 per square metre is a useful early guide for reaching wind and watertight. A 5 m by 4 m example would therefore be about £60,000 at that stage. It isn't a fixed quote, as access, structure and design affect the price. Heating, lighting, flooring, plastering and decoration then shape the completed flat roof extension in Glenrothes.

Why Choose Us

Clearer decisions before the structure goes up

Budget by build stage

We separate shell work from the later fit-out when discussing early costs.

Glazing planned with purpose

We balance bifold doors and rooflights against privacy and useful wall space.

A liveable final room

We can coordinate services and finishes after the shell is weatherproof.

What does wind and watertight mean?
It means the main structure, roof and external openings have progressed far enough to protect the interior from the weather. Internal insulation, services, plastering, flooring, joinery and decorating may still be required before the room is ready to use.
Is £3,000 per square metre a fixed price?
No. It is an early budgeting guide for reaching the wind-and-watertight stage. Ground conditions, access, structural details, glazing and the design all affect the actual figure. We discuss the specific plans before providing project pricing.
Can the extension include bifold doors and rooflights?
Yes, those features can be considered as part of the design. Their size and position should suit the structure, internal layout and direction of natural light. We also plan how the new opening and floor level connect with the existing house.

Start with the size and intended finish

Call us to discuss your extension plans, glazing choices and whether you need a shell or completed room.

Call 01592 348774