First-floor extensions in Falkirk, Stirling and Clackmannanshire

Falkirk, Stirling and Clackmannanshire at a glance

Nation: Scotland
Price region: Scotland
Postcode areas: EH, FK
Towns covered: 12 listed below, plus surrounding villages
Approval route: Planning permission is usually needed: Class 1B permitted development only applies if every part of the extension is at least 10 m from all boundaries. A building warrant is needed before work starts.
Site visits: Free, no obligation

What a first-floor extension involves

A first-floor extension is a new upstairs room built on top of an existing single-storey part of your house, such as a rear kitchen extension, a utility or a side annexe. It adds a bedroom, bathroom or study without enlarging the footprint. Whether it works depends mainly on whether the walls and foundations below can carry the extra load.

The main places we list in Falkirk, Stirling and Clackmannanshire are Stirling (FK8), Falkirk (FK1), Alloa (FK10), Grangemouth (FK3), Bo’ness (EH51) and Stenhousemuir (FK5). We cover the villages in between too.

Guide price in Scotland

In Scotland, which includes Falkirk, Stirling and Clackmannanshire, we'd expect a first-floor extension to cost around £23,500–£34,000 for 4 m × 3.5 m of new first-floor space (14 m²), or £1,690–£2,440 per m² including VAT. These are guides, not quotes. Ground conditions, steelwork and access can move the figure either way.

Spec	Per m²	Typical project
Essential	£1,560–£2,250 per m²	£22,000–£31,500
Standard	£1,690–£2,440 per m²	£23,500–£34,000
Premium	£2,030–£2,930 per m²	£28,500–£41,000

Rules in Scotland

In Scotland, permitted development for extensions of more than one storey (Class 1B) needs at least 10 m to every boundary and no part higher than the house. Most first-floor extensions cannot meet the 10 m test, so plan for a householder application (£371, decided within two months) and a building warrant before work starts.

Approval in Scotland: Householder planning application: £371. Councils have two months to decide a local planning application.

Building standards: A building warrant from the council's building standards service before work starts, and a completion certificate at the end. Scotland uses its own Technical Handbooks.

There is no Party Wall Act in Scotland. Shared walls and boundaries are governed by title deeds and common law, so we speak to neighbours early and record the condition of shared structures.

Getting the design right

Can the existing structure take it?

Many single-storey extensions were built with foundations, walls and lintels sized for one storey. We find out what is there with trial holes and, where available, the original building standards drawings. The engineer then decides whether to reuse, strengthen or rebuild parts of the structure.

Tying into the house

The new floor and walls must line up with the existing first floor, often through a new opening in the rear wall above the old one. Floor levels, the position of upstairs windows and the existing roof all affect where the opening can go, so we survey both floors carefully.

How we work in Falkirk, Stirling and Clackmannanshire

Look at the house
We start in Falkirk, Stirling and Clackmannanshire with a free visit: measurements, photos, a look at the loft and drains, and a frank chat about budget.
Design and approvals
We draw the extension and check it against the rules for Scotland, then apply for planning permission or a certificate of lawfulness, whichever fits.
Detail and price
Construction drawings, engineer's calculations and building warrant approval, then a written fixed price for the build.
Build and sign-off
Vetted teams working under S&K build the extension, and we arrange the completion certificate at the end.

Towns we cover in Falkirk, Stirling and Clackmannanshire

First-floor extensions in Falkirk, Stirling and Clackmannanshire: questions

How much does a first-floor extension cost in Falkirk, Stirling and Clackmannanshire?

In Scotland our guide is £1,690–£2,440 per m² including VAT, so about £23,500–£34,000 for 4 m × 3.5 m of new first-floor space (14 m²). Essential and Premium specs move that by roughly 8% down or 20% up.

What happens to the room below while the first floor is built?

The old roof is removed, so the room below is exposed for a short period. We fit temporary weather protection, plan the work so the roof comes off only when the new structure is ready, and agree with you which rooms will be out of use and for roughly how long.

Can I build on top of my existing single-storey extension?

Often yes, but only after the structure has been checked. Foundations, walls and lintels built for one storey may not carry two. We dig trial holes, look for the original a building warrant and ask the structural engineer to confirm what can stay, what needs strengthening and what must be rebuilt.

Will I need planning permission in Falkirk, Stirling and Clackmannanshire?

Falkirk, Stirling and Clackmannanshire is in Scotland. Planning permission is usually needed: Class 1B permitted development only applies if every part of the extension is at least 10 m from all boundaries. A building warrant is needed before work starts.

Neighbouring areas

All extension services in Falkirk, Stirling and Clackmannanshire · About first-floor extensions