Three households in four live in a flat
The Scottish House Condition Survey puts 74% of Glasgow households in flats, the highest share of any Scottish council and about double the national figure. Much of that is the sandstone tenement. Between 1872 and 1876 alone the city put up 21,000 tenement flats, most of them four storeys high.
So a Glasgow loft job is often a top-floor flat owner looking at the space above the ceiling. That changes the project. Scotland's permitted development rights for dormers don't apply to flats, so any tenement dormer needs planning permission. And before the planners see a drawing, you need to know the roof is yours to build on.
Is the roof actually yours?
Start with the title deeds, not the builder. Under the Tenements (Scotland) Act 2004 the default position is that a top flat extends up to and includes the roof over it, along with the triangle of airspace under the slope. But that only applies where the deeds say nothing different. If your deeds make the roof common property, the airspace is common property too, and it isn't yours alone to build into.
Even when the roof is yours, the repairs aren't. The Act's Tenement Management Scheme counts the roof, rafters included, as scheme property, so the whole building pays toward keeping it watertight. If a factor manages the building, tell them at the start. My advice is simple. Pay a solicitor to read the deeds before you pay anyone to draw a dormer.
Cottages, semis and the ten-metre rule
Houses are the minority here, but there are plenty of them, many from the Corporation's inter-war schemes. Riddrie went up between 1920 and 1927 with about 1,000 homes, cottages with gardens alongside tenement flats. Knightswood followed with 6,714 houses, none over two storeys.
For a house, Class 1D of the Scottish permitted development order allows a dormer without an application, within limits. It can't be on a slope facing a road. It can't rise above the existing roof, take up more than half the roof's width at the eaves, or come within 30cm of any edge. And the roof slope it sits on must be more than 10 metres from the boundary it faces. Measure that one first. None of it applies in a conservation area.
How each type fits the city's roofs. The full guides cover the whole UK, so read them with the Scottish rules here.
Planning first. A flat, a conservation area or a listed building each means an application for a dormer. The English volume allowances you'll read about elsewhere don't apply in Scotland.
Rooflights. For a tenement top flat this is the least contentious option, because the shape of the roof stays as it is. In a conservation area it still needs permission. Expect to be steered toward slim conservation-style rooflights off the front slope.
Rear dormer. On a Riddrie or Knightswood semi outside a conservation area, the likeliest type to go ahead without an application, if your plot passes the ten-metre test. A tenement dormer needs permission, and the council wants it well below the ridge and set back at least 300mm from the eaves.
Hip to gable. A question for semi and detached owners whose roof slopes at the end, not for tenements. Don't assume it's permitted development. Ask the council before paying for drawings.
Read our full guide: Hip-to-Gable Loft Conversions: What It Involves and Which Houses It Suits →
Mansard. Treat it as a planning application every time, and a hard one on a stone tenement. A mansard rebuilds the whole slope, so bring in an architect early.
L-shaped dormer. Few Glasgow homes have the rear back wing this needs. Where one does, note that council guidance prefers two small dormers on a slope to one large one.
Extra bedroom. The warrant drawings must show how you'd get out of the new room in a fire, and in a top flat that route runs down through your own home to the common close. No work can start until the warrant is granted.
Home office. A tenement loft too low for a proper bedroom can still make a decent study under rooflights. Ask what headroom is left once the new floor goes in.
Read our full guide: Loft Home-Office Conversion: What Works Well Up There and What to Specify →
En-suite. In a tenement, a pipe or stack that serves more than one flat is common property under the 2004 Act. Connect into one and the neighbours have an interest, so plan drainage first.
Cost. We don't publish a price for Glasgow. With a tenement, part of the bill is legal work on deeds and neighbour agreements, which no online calculator knows about. Three builders looking at your roof will.
Conservation areas and grey slate
Glasgow has 25 conservation areas, among them Glasgow West, Park, Woodlands, Dennistoun, Strathbungo, Crosshill and both East and West Pollokshields. Inside any of them, roof alterations and changes to the outside of a flat come under planning control automatically, and the council says Article 4 directions apply in most. Its property search shows whether your address is inside one.
Then there's the roof itself. Council guidance says stone tenements should be re-roofed in grey slate or flat grey tiles, with dormers finished to match. That's harder than it sounds. Historic Environment Scotland points out that no slate quarries operate in Scotland today and reclaimed Scottish slate is running short. The city also has more than 1,800 listed items, and a listed building needs listed building consent for changes inside as well as out.
Every conversion then needs a building warrant from the council's Building Standards and Public Safety team, through the eBuilding Standards portal. In Scotland the council is the only verifier, so there's no private firm to go to instead. Glasgow aims to respond within 20 days, and a warrant lasts three years. At the end you submit a completion certificate, the council inspects, and within 14 days it says whether it accepts it. Keep that letter with the deeds.
Where these facts come from
- Scottish Government: Planning Circular 1/2024, householder permitted development (Class 1D)
- Scottish Government: Planning Circular 1/2024, changes to a flat
- Tenements (Scotland) Act 2004, section 2 and explanatory notes
- Tenements (Scotland) Act 2004, Tenement Management Scheme rule 1.2
- Scottish House Condition Survey: local authority tables 2022 to 2024
- Glasgow City Council: conservation areas and appraisals
- Glasgow City Council: conservation area designations and Article 4
- Glasgow City Council: residential development guidance (dormers, re-roofing)
- Glasgow City Council: building warrant applications
- Glasgow Life: Homes for heroes (Riddrie, Mosspark, Knightswood)
- The Glasgow Story: tenements
- Historic Environment Scotland: slate and Scotland's historic roofs
How FirQuote works in Glasgow: We connect you with local specialists who visit your property before giving you a price. You get up to 3 written quotes — no call centres, no estimates from photos, no obligation to accept any quote.
Questions people in Glasgow ask
I own the top flat in a tenement. Can I convert the loft?
Possibly. First get a solicitor to confirm from the deeds that the roof and its airspace belong to your flat. Then apply for planning permission for any dormer. The building warrant comes after that.
My deeds say the roof is common property. What now?
Then the airspace under the roof is common property too, shared with the other owners. Don't build into it without their written agreement, and have your solicitor say how that agreement should be recorded so a future buyer can rely on it.
I have the upstairs flat of a four-in-a-block. Am I a house or a flat?
A flat, for Scottish planning purposes, because your home sits above another. The house rules for dormers don't cover you, so a dormer means an application. Your deeds will also say who owns the roof.
Can my builder use a private building control company, like in England?
No. In Scotland the local authority is the verifier, so a Glasgow loft goes through the council's building standards service. Starting work that needs a warrant without one is an offence, and the council can order it removed.