Mansard loft conversions in County Down

Covering County Down

We cover County Down, including Bangor, Newtownards, Newry and Banbridge, and the towns around them.

Homes in County Down

Housing in Northern Ireland mixes terraces in Belfast and Derry with detached houses and bungalows in towns and rural areas, many with room to extend.

What is a mansard loft conversion?

Mansards are a bigger structural job than other conversions because the roof is largely rebuilt. They normally need planning permission, and many councils have design guides setting the angle, materials and window style. We prepare the design to those guides and build in slate, lead and timber or approved alternatives.

Planning and building control applications to the council
Roof removal and new mansard frame
En-suite, electrics and fire safety

What is the guide price for a mansard loft conversion in County Down?

Guide prices for mansard loft conversions, including VAT where it applies. Your fixed price is confirmed in writing after the survey.

Mansard loft conversions	Guide price incl. VAT
Rear mansard	£65,000 to £85,000
Front and rear (double) mansard	£80,000 to £110,000

Do you need permission for a mansard loft conversion in County Down?

In Northern Ireland the council handles both planning and building control. Permitted development rules are set by the Planning (General Permitted Development) Order (Northern Ireland) 2015, and there is no party wall act, so we agree access and protection with neighbours in writing.

This needs full planning permission from the council in Northern Ireland, plus building control approval.

What should County Down homeowners check first?

The roof is open for longer than with a dormer, so weather protection matters.
Council design guides often require natural slate and lead.

How does the project run?

Start with a conversation. A short call or the online form is enough for us to understand what you want to build.
Survey at your house. We look at the existing structure, services and access, and agree what the design needs to achieve.
Design and fixed price. You get drawings and a written price for the agreed specification before anything is ordered.
Build and hand over. Our teams build to the programme, building control inspects, and you get the completion paperwork at the end.

What people ask before starting

Does a mansard need planning permission?

Almost always, because it changes the roof profile.

How long does a mansard take?

Around 10 to 14 weeks on site after planning approval.

How do I get a price for mansard loft conversions in County Down?

Use the guide price tool for a ballpark figure, then book a visit for a fixed written price for the agreed specification.

Also covering

Learn more about mansard loft conversions, or see every project we cover in County Down.