Modular Extensions Scotland
Extensions made under cover, then lifted or carried in and closed up within days. From the Borders to Shetland.
Get a quoteMost of the building happens somewhere dry
Modular house extensions are made indoors, as finished modules or flat panels, while the foundations go in at home. The room then arrives by lorry and is weathertight within days, so walls and insulation never stand open to a Scottish winter.
You still need a design that suits the house, a building warrant and a firm that will travel. We explain the Scottish rules and costs, and find that firm.
What it costs
Pick a floor area and a build method. Ranges are UK-wide for 2026 with VAT included, as nobody publishes Scottish figures. More on the cost page.
Typical installed price, single storey, including VAT
£50,500 to £79,000
A guide, not a quote. National 2026 figures; island and remote delivery costs more.
Made for the road it has to travel
A load wider than 2.9 m needs police notice before it moves, and many Highland and island roads will not take one. Good firms match the method to the route: whole modules where a crane can stand, flat panels where the last mile is a ferry or a farm track.
What changes north of the border
| Subject | Scotland | England |
|---|---|---|
| Approval to build | A building warrant, granted before work starts | Building regulations, often signed off as work goes on |
| Single storey, no planning | 3 m deep on a terrace or 4 m elsewhere, for parts within 1 m of a boundary | 3 m or 4 m by house type, wherever it sits |
| Two storeys, no planning | Only if 10 m from every boundary | Up to 3 m deep, 7 m from the rear boundary |
| Conservation areas | No permitted development for extensions | Reduced rights |
| Shared walls | Title deeds and common law | Party Wall etc. Act 1996 |
Summarised from Scottish Government and UK Government guidance. More on permitted development and building warrants.
Before you ask
What does a modular extension cost in Scotland?
Finished modules usually come to £2,100 to £3,300 per m² fitted, VAT included, and panel systems start lower, at about £1,300 per m². Those are UK-wide 2026 figures, offered as a guide, not a quote. For your own floor area, the cost calculator does the sum.
Is a prefab extension the same thing?
Near enough. Prefab covers anything made off site. Modular usually means finished room-sized units craned into place; panel systems arrive flat and go up in a few days.
Can one be delivered to the Highlands or an island?
Usually, though whole modules are limited by ferries and single-track roads. Panels that travel flat on an ordinary lorry are the common answer.
Price the room you have in mind
Three short screens: the postcode, four questions about the room, and how to contact you. There is no charge and no obligation to go ahead.
We don't build extensions ourselves. We match your enquiry with one firm that works in your area, name it to you, and send your details over only once you agree.
Your enquiry is in.
- A call or email from us, usually inside a working day, names a firm that is active in your part of Scotland.
- Your details stay with us until you say they can be sent across.
- Once you agree, the firm books a visit, looks at the house and the access, and prices the room. We send no marketing.