What is a mansard loft conversion?
A mansard loft conversion rebuilds the roof with a nearly vertical slope (about 72 degrees) and a flat top, effectively adding a new storey. Small dormer windows sit within the steep slope. Mansards are common on period terraces in towns and cities.
How much does a mansard loft conversion cost in the Scottish Borders?
In the Scottish Borders, a mansard loft conversion typically costs £63,000–£92,000 for a typical rear mansard, including VAT at 20% (standard rate). Prices in Scotland sit near the national average for this kind of work, and the range for the Scottish Borders reflects that. Design, structural calculations and council fees are extra.
| Size or type | Guide range |
|---|---|
| A typical rear mansard | £63,000–£92,000 |
| Higher specification | £92,000–£115,000 |
The main things that change the cost:
- Scaffolding on busy streets
- Front, rear or both
- Number of dormers and lead work
- Roof covering: natural slate costs more
Use the guide price tool to see how size and specification change the figure, then ask for a written, itemised quote.
Do you need planning permission for a mansard loft conversion in the Scottish Borders?
The approval route for the Scottish Borders is set by planning law in Scotland. In Scotland a mansard needs planning permission and a building warrant.
In Scotland a building warrant is needed before work starts on most extensions, loft conversions and conversions. It is issued by the council’s building standards service. When the work is finished, a completion certificate is submitted and accepted by the council after inspection.
Our first visit includes a check of your planning history, so you know the route before paying for drawings.
What we handle
On a typical mansard loft conversion we handle:
- Staircase and fire-safe escape route
- Structural design and calculations
- Building control sign-off
- New roof structure, slate or tile covering and lead work
- Insulation, electrics, plumbing and plastering
- Dormer windows
How long does it take?
Build time is typically 9 to 12 weeks on site, after planning approval. Allow time beforehand for drawings and approvals, usually 3 to 4 months.
Building in the Scottish Borders
Scotland’s housing ranges from sandstone tenements and villas to post-war and modern estates, and the building warrant system shapes how projects are planned.
Towns we cover in the Scottish Borders include Hawick, Galashiels, Peebles, Kelso and Selkirk.
How it works
- 01
Visit and measured survey
A free visit to understand the project, check access and take measurements.
- 02
Drawings and written quote
We prepare the design and give you a written, itemised quote with inclusions and exclusions.
- 03
Approvals
Planning or permitted development confirmation, building regulations and any party wall matters.
- 04
Build and handover
Work follows the agreed programme, with inspections along the way and a completion certificate at the end.
Questions about mansard loft conversions in the Scottish Borders
How much does a mansard loft conversion cost in the Scottish Borders?
In the Scottish Borders, a mansard loft conversion typically costs £63,000–£92,000 for a typical rear mansard, including VAT at 20% (standard rate). Your fixed price depends on the survey and drawings.
What roof covering is used?
Natural slate is traditional; some councils accept other materials. We follow local guidance.
Why choose a mansard over a dormer?
A mansard gives more usable floor space and a neater appearance from the street, but costs more and needs planning permission.
Who approves a mansard loft conversion in the Scottish Borders?
Planning matters in the Scottish Borders go to the council covering your address, and the work needs a building warrant. We prepare and submit the applications for you.
Do I need planning permission for a mansard loft conversion in the Scottish Borders?
In Scotland a mansard needs planning permission and a building warrant.
Can I stay at home?
Usually. The new roof is built under a temporary cover so the house stays dry.