Loft and attic conversions in Glasgow

A loft conversion turns the space under your roof into a bedroom, office or bathroom. It's mostly a good fit for houses and bungalows with enough height in the roof. Expect to pay somewhere around £42,000 in Glasgow, with a wide range either side.

We don't convert lofts. We pass your enquiry to one independent local firm, who looks at your roof and quotes you directly. Free to use, no obligation.

Average from MyJobQuote's Glasgow loft guide (9 October 2026). The price depends a lot on the type, as the table below shows.

The main types

• Rooflight (often called Velux). Windows set into the existing slope, with the roof shape left alone. The cheapest route, but only where there's already good height.
• Dormer. A box built out from the slope to give you standing room and straight walls. Commonly on the rear of semis and bungalows.
• Hip-to-gable. For a house with a sloping side to its roof. The slope is built up into a vertical gable wall, which makes the space far more usable.
• L-shaped dormer. Two joined dormers, one over a rear projection. It can fit two bedrooms, or one with an en-suite.
• Mansard. The roof is rebuilt with steep, near-vertical sides and a flat top. It's the biggest change, and it usually needs planning permission.

What it usually costs

Source: MyJobQuote, Loft Conversion Cost in Glasgow (9 October 2026), based on quotes given through its platform. Adding an en-suite is put at a further £5,000 to £12,000.

The price moves mainly with the type you choose and how much steelwork the roof needs. A trussed roof, the kind with criss-cross timbers found on many newer houses, needs more work than a traditional one. Size, access, scaffolding and your choice of finishes all count too. Our cost guide goes through the extras in detail.

Rules, dates and prices on this page were last checked on 30 October 2026.

Planning and building warrant

A building warrant is needed. mygov.scot lists converting a loft into a room among the work that needs one (updated 24 November 2025). You must have it before work starts. Starting without one is an offence.

Planning permission depends on what changes outside. Rooflights that don't enlarge the house are normally covered by permitted development, as long as they stick out no more than a metre. A dormer has its own limits under Class 1D in Scottish Government Circular 1/2024 (published 28 May 2024). Here's the short version:

• Not on a roof slope that fronts a road.
• At least 10 metres from the boundary that slope faces.
• No higher than the existing ridge.
• No more than half the width of the roof slope, and at least 0.3 m from its edges.
• Not on a flat, and not in a conservation area.

Miss any one and you need to apply. That isn't a disaster, just more time and a fee. Our planning guide explains how it works for hip-to-gables, mansards and flats.

Things that can stop it, or change it

• Not enough height. A shallow roof may need a dormer or a raised roof to work at all.
• No room for a stair. The stair has to land somewhere, often taking a bit of a bedroom or the landing.
• Fire escape. A new top floor changes what's needed on the way out. On many two-storey houses the stair has to be protected with fire doors.
• Shared roofs. On a semi or terrace, the wall and roof are partly your neighbour's concern. In a flat, they're very much their concern.

The suitability guide covers each of these, with the measurements from the building standards handbook.