Forth Valley
Two-storey rear extensions in Forth Valley
A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. Rear extensions in Forth Valley: we cover 6 towns including Stirling, Falkirk and Alloa, with design, approvals and the build under one contract.
In Forth Valley we check the neighbours' rear windows first, because the upper floor is where most two-storey schemes win or lose planning. Post-war semis and terraces are common around Forth Valley, and many have room for a single-storey rear extension within Class 1A limits.
How much does a two-storey rear extension cost in Forth Valley?
In Forth Valley, our guide for a two-storey rear extension is £1,710–£2,560 per square metre including VAT for a standard specification. Prices in Scotland sit a little below our West Midlands baseline; building warrant fees and drawings are budgeted separately.
| Size | Guide price inc VAT |
|---|---|
| 3 m × 5 m footprint, two floors (30 m²) | £51,500–£77,000 |
| 4 m × 6 m footprint, two floors (48 m²) | £82,000–£123,000 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission in Forth Valley?
In Scotland an extension of more than one storey is only permitted development (Class 1B) if no part is within 10 metres of any boundary and it is no higher than the existing house, so almost every two-storey rear extension needs planning permission and a building warrant.
Classes 1A and 1B do not apply in conservation areas, and listed buildings need listed building consent.
Where in Forth Valley do we work?
FAQ
Questions people ask
Does a two-storey rear extension need planning permission?
Almost always. England and Northern Ireland allow 3 metres without an application only if at least 7 metres remains to the rear boundary; Wales and Scotland are similar or stricter.
Is two-storey cheaper per square metre than single-storey?
Usually yes, because the foundations and roof are shared across twice the floor area. The total cost is higher.
Can I add an en-suite upstairs?
Yes. We plan the soil pipe route early so the bathroom sits where drainage works without boxing through the room below.
Do you cover all of Forth Valley?
We cover 6 towns and districts in Forth Valley, including Stirling, Falkirk and Alloa.
Who builds the extension?
Vetted building teams working under contract to us; your contract is with S&K Property Investments and Improvement Ltd.