What is a rooflight loft conversion?
A rooflight loft conversion (sometimes called a roof window conversion) keeps the existing roof shape and adds roof windows that sit flush with the slope. The floor is strengthened, a staircase is added and the space is insulated and finished.
How much does a rooflight loft conversion cost in Dunbartonshire?
In Dunbartonshire, a rooflight loft conversion typically costs £29,000–£43,500 for a typical rooflight conversion, including VAT at 20% (standard rate). Building costs in Scotland are close to the UK average, so the figures for Dunbartonshire are close to our national guide. Design, structural calculations and council fees are extra.
| Size or type | Guide range |
|---|---|
| A typical rooflight conversion | £29,000–£43,500 |
| Higher specification | £43,500–£54,500 |
The main things that change the cost:
- Storage and finishes
- Fire safety upgrades
- Floor and roof strengthening
- Number of roof windows
Your exact price depends on the survey and drawings. The guide price tool gives a quick range in the meantime.
Do you need planning permission for a rooflight loft conversion in Dunbartonshire?
Here is how the rules work for a rooflight loft conversion in Scotland. In Scotland rooflights that project no more than 1 metre from the roof are often permitted development, though conservation areas and listed buildings need consent. A building warrant is needed for the conversion itself.
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.
At the survey we check your house’s planning history and any restrictions, and tell you which route applies.
What we handle
On a typical rooflight loft conversion we handle:
- Staircase and fire-safe escape route
- Head-height survey
- Floor joists and any steel beams
- Building control sign-off
- Electrics, heating and plastering
- Roof windows installed
How long does it take?
Build time is typically 4 to 6 weeks on site. Before that, surveys, drawings and approvals usually take 6 to 12 weeks, longer if the council asks for changes.
Building in Dunbartonshire
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 Dunbartonshire include Bearsden, Clydebank, Dumbarton and Kirkintilloch.
How it works
- 01
Free visit
We look at the property, talk through what you want and measure up. There is no charge and no obligation.
- 02
Design and pricing
Design options, then a fixed quote based on the chosen drawings and specification.
- 03
Approvals in place
We handle planning, building control and neighbour notices before work starts.
- 04
Construction and completion
We build, put right any snags and hand over the building control certificate.
Questions about rooflight loft conversions in Dunbartonshire
Is it cheaper than a dormer?
Yes, usually, because the roof shape stays the same. But you gain less full-height floor space.
Do I need planning permission for a rooflight loft conversion in Dunbartonshire?
In Scotland rooflights that project no more than 1 metre from the roof are often permitted development, though conservation areas and listed buildings need consent. A building warrant is needed for the conversion itself.
Can I have a bathroom?
Yes, where there is enough head height at the shower or bath position.
How much head height do I need?
Around 2.2 metres or more from the top of the ceiling joists to the ridge is a good starting point. Insulation and new floor joists reduce the height.
Who approves a rooflight loft conversion in Dunbartonshire?
Planning matters in Dunbartonshire go to the council covering your address, and the work needs a building warrant. We prepare and submit the applications for you.
How much does a rooflight loft conversion cost in Dunbartonshire?
In Dunbartonshire, a rooflight loft conversion typically costs £29,000–£43,500 for a typical rooflight conversion, including VAT at 20% (standard rate). Your fixed price depends on the survey and drawings.