Dormer Loft Conversion
Frequently Asked Questions
We hope this page provides clear and helpful answers for those considering a loft conversion who may have numerous questions about the process; we are here to make your decision as straightforward and informed as possible.
1
How much value does a dormer loft conversion add to my home?
A well-executed dormer loft conversion can increase your property's value by 15–25% (often £50,000+ in the South East), providing extra bedrooms or living space without the hassle of moving — it's one of the most cost-effective home improvements with strong ROI.
2
Is my house suitable for a dormer loft conversion?
Most homes with a pitched roof and sufficient head height (ideally at least 2.2–2.4m at the ridge) are suitable, but a site survey by our team is essential to check roof structure, pitch, obstacles (like chimneys), and floor joist strength.
3
How much does a dormer loft conversion cost in Sussex?
A typical dormer loft conversion in the UK costs between £40,000 and £60,000 (averaging around £45,000–£50,000), depending on the size, complexity, location, finishes, and any additional features like an ensuite — contact us for a free, no-obligation quote tailored to your property!
4
How long does a dormer loft conversion take ?
Most dormer loft conversions in the UK are surprisingly straightforward, the build phase usually takes 6 to 8 weeks from the moment the team arrives on site to the day you get your keys back (and can start enjoying the new space!).
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Simpler single rear dormers (the most common choice here in Sussex): Often wrap up in 5–7 weeks.
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Larger or more complex ones (double dormers, extra bathroom, or tricky roof shapes): Closer to 8–10 weeks.
5
Do I need planning permission for a dormer loft conversion?
Most rear dormer loft conversions fall under Permitted Development rights and don't require planning permission (as long as they meet volume limits like 40m³ for terraced or 50m³ for semi-detached/detached homes, set back from eaves, and avoid the front elevation), but always check with your local council or apply for a Lawful Development Certificate for peace of mind — full permission is needed in conservation areas, listed buildings, or for front/side-facing dormers.
6
Can I add an ensuite bathroom to my dormer loft conversion?
Absolutely — many of our clients choose to include an ensuite bathroom in their dormer conversion for added luxury and functionality (especially in a master bedroom suite), which involves additional plumbing, waterproofing, and ventilation to meet building regs — our dedicated architect can design and quote this as part of your tailored plan, often without significantly extending the timeline.
7
What types of dormer are available, and which is best for my home?
Common dormer styles include flat-roof (most popular and cost-effective for maximum space), pitched-roof (more traditional look), L-shaped (great for wrapping around extensions on Victorian/Edwardian homes), or double dormers (for extra width on larger properties) — the best option depends on your roof pitch, house type, and budget; our team provides free initial assessments in Sussex to recommend the ideal design for your property.
