Stone terraces with the attic already in
Walk any street east or west of the city centre and you are looking at the same recipe. Buff local sandstone, dressed on the front and rubble at the back, under slate laid in diminishing courses. The stone is Pendle Grit, shipped out in the 19th century as Lancaster Freestone. The slate is mostly Cumbrian blue-grey, with some Welsh.
Most of those terraces went up under the byelaws between the 1870s and about 1900. Plenty of them were built with a room in the roof from the start. The council's own appraisals record attic dormers on Regent Street, attic levels on Dallas Road and Lindow Square, and gabled attic dormers along Westbourne Road. In parts of Lancaster you are improving a loft room, not adding one.
The catch is the slate. Older roofs that have been stripped and relaid in concrete tile are listed by the council as damage to the street. Do the work properly and the new dormer cheeks and roof slopes go back in slate.
How much of the city is a conservation area
More than most people expect. Older areas were merged into the Lancaster conservation area in 2011, and it runs in eleven character areas, from St George's Quay and the Castle out through the terraced streets on both sides of the centre. On top of that the city has its own smaller areas, including Aldcliffe Road, Greaves Road, Cannon Hill, Williamson Park, Bath Mill, Westfield Memorial Village and Lancaster Moor, where the old asylum blocks have been turned into homes.
Inside any of them, a dormer, a hip to gable or a mansard needs planning permission. That applies to the back slope as well as the front, so the usual permitted development route for a rear dormer is off the table. Rooflights are normally still allowed without an application, but not everywhere.
Some streets also carry an Article 4 direction. On the west side of Dallas Road, the north side of Lindow Square and part of the west side of Regent Street, the direction controls the front roof slope as well as doors and windows. A front rooflight there needs permission. Bath Mill and Westfield have their own directions, so check the council's heritage map before anyone draws anything.
Which conversion suits which Lancaster house
How each type sits on the houses here. Each has a full guide.
Rear dormer. Suits the plain two-storey terraces. Outside a conservation area it can often go up as permitted development. Inside one, it needs an application, and a dormer clad in slate with a modest face tends to fare best.
Rooflights only. On a two and a half storey terrace that already has an attic, this may be all you need. Keep them to the rear slope. The appraisals call front skylights out as harmful, and on the Article 4 streets they need consent.
L-shaped dormer. For terraces with a two-storey back outrigger, like the gabled ones on Wolseley Street. The second dormer over the outrigger is usually where the shower room fits.
Hip to gable. Needs a hipped roof, so it's for semis and detached houses, not the terraces. The appraisals note 1930s hipped semis at the south end of Ashfield Avenue. Those sit in the conservation area, so the new gable would need planning permission.
Read our full guide: Hip-to-Gable Loft Conversions: What It Involves and Which Houses It Suits →
Mansard. Hard to justify on a long, uniform sandstone terrace, where the roofline is half the point. Expect a full application and a long conversation with the conservation officer.
Extra bedroom. Three-bedroom homes make up about four in ten households in the built-up area, so a fourth bedroom is the usual brief. The staircase decides it. On a narrow terrace, plan where it lands before you plan the room.
En-suite. Where a terrace has a back lane and yard, the new soil pipe can usually run down the rear wall. Put the bathroom on that side of the loft and the plumbing stays simple.
Home office. The two and a half storey houses on Westbourne Road and Regent Street already have attic rooms that make a good study once insulated. Ask for a data cable to be run up while the floor is open.
Read our full guide: Loft Home-Office Conversion: What Works Well Up There and What to Specify →
Planning. Settle the conservation area question first. A large share of Lancaster's Victorian housing sits inside one, and that changes the answer for every dormer.
Cost. We don't publish a Lancaster price. Reclaimed slate or a planning application can land on one job and not the next, so get three quotes from people who have seen the roof.
Inspections and sign-off
Building regulations go through Lancaster City Council's building control service, unless your builder uses a private approver. Give notice when work starts and again when it finishes. Busy weeks can need up to four working days' notice for a visit.
Don't board over the steels before the inspector has seen them. The council warns it may not issue a completion certificate for work it couldn't inspect, and a buyer's solicitor will ask for one.
Where these facts come from
- Lancaster City Council: conservation areas and constraints
- Lancaster City Council: Article 4 directions
- Lancaster Conservation Area Appraisal: introduction (2013)
- Lancaster CAA: Residential South West
- Lancaster CAA: Westbourne Road
- Lancaster Moor Conservation Area Appraisal
- Lancaster City Council: building regulation inspections
- Lancashire Strategic Stone Study
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Questions people in Lancaster ask
I live on Dallas Road. Can I put a Velux in the front of the roof?
Not without asking. The west side of Dallas Road, the north side of Lindow Square and part of Regent Street are covered by an Article 4 direction that controls the front roof slope. Put rooflights on the back, or apply to the council for the front.
I want to convert the loft of a terrace I let to students. What changes?
Since 10 November 2021, turning a family house into a small HMO for three to six people has needed planning permission in Bulk, Castle, John O'Gaunt, Marsh, both Scotforth wards, both Skerton wards and Galgate. The council also limits HMOs to 10% of homes within 100 metres. If the extra loft room takes you to five or more tenants from separate households, you need an HMO licence too.
My roof has already been redone in concrete tiles. Do I have to go back to slate?
Outside a conservation area, no. Inside one, the council's appraisals treat concrete tiles as harmful, and an application for a dormer is a fair point for the planners to ask for slate. Reclaimed Cumbrian or Welsh slate will help the case.
My house is in Lancaster Moor. Can I convert the loft?
Lancaster Moor is a conservation area, so any dormer needs planning permission. The former asylum blocks are listed and now converted to homes, so work on those needs listed building consent too. The appraisal says newer housing was left outside the boundary where possible, so check the conservation area map for your address.