Rebuilding the roof slope almost vertically for the most space, common on terraced houses. Tell us about your project and we review it before matching it with up to three contractors suited to it.
Loft conversions
Mansard conversions
Rebuilding the roof slope almost vertically for the most space, common on terraced houses.
What is typically involved
- Planning permission in most cases
- Substantial structural design
- Party Wall notices
- Building Regulations approval
Before you apply, it helps to have
- Your budget range, honestly estimated
- Where you are with planning, drawings and structural design
- Photos of the property, and any drawings or approvals you already have
- A rough idea of when you would like work to start
Planning and regulations
In England, many loft conversions to houses are permitted development, within volume limits (40 cubic metres for terraced houses, 50 for semi-detached and detached) and other conditions, such as no dormers on a roof slope facing the road. Mansard conversions and anything in a conservation area usually need planning permission.
Every loft conversion needs Building Regulations approval, which covers the structure, the staircase and the fire escape route.
Related projects
- Dormer loft conversions
A box dormer on the rear roof slope for full-height space across the loft.
- Hip to gable conversions
Building the sloping side of a hipped roof up into a vertical gable, often with a rear dormer.
Mansard conversions by town
Choose your town to see who decides planning there.
HQuestions
Good to know
Will I need planning permission?
Many loft conversions are permitted development, but not all. Mansards, front dormers and homes in conservation areas often need permission. Your designer or the council can confirm.
Can I combine a loft with an extension?
Yes. Select both in the application. It is one project, matched with contractors who do both.
What kinds of project do you take on?
New builds, extensions, loft conversions and major renovations across Bedfordshire, Hertfordshire and Buckinghamshire. Tell us about yours and we will be honest about whether we can help.
How many contractors will contact me?
Your project can be matched with up to three contractors, chosen by our team for your type and size of project. Your details are not sold to a list.
Do I need planning permission or drawings first?
No. Tell us where things stand today. Projects at every stage are welcome, and we will be in touch at the right moment.
