Mansard loft conversions in County Antrim

Covering County Antrim

Our coverage across County Antrim includes Belfast, Lisburn, Newtownabbey and Carrickfergus.

Homes in County Antrim

Across Northern Ireland you find city terraces, suburban semis and rural bungalows and farmhouses, so the right approach depends on the plot and the planning history.

What is a mansard loft conversion?

A mansard loft conversion replaces one or both slopes of a roof with a near-vertical wall, typically at 70 degrees, with small dormer windows set into it. It creates almost a full extra storey and is common on terraced houses in towns and cities, particularly in London.

Planning and building control applications to the council
Slate cladding and lead-clad dormers
En-suite, electrics and fire safety

How much should I budget for a mansard loft conversion?

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

How is a mansard loft conversion approved in County Antrim?

Projects in Northern Ireland need planning clearance from one of the eleven councils and building control approval, also from the council. The Party Wall etc. Act does not extend to Northern Ireland, so work near neighbours is agreed directly and documented carefully.

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

What should I think about before starting?

Council design guides often require natural slate and lead.
Scaffolding and a temporary roof are usually needed.

How does the project run?

Send us the details. Give us a postcode, a rough idea of size and some photos, by phone, form or the guide price tool.
We visit and measure. A surveyor checks the house, the boundaries and the ground, and discusses what is realistic.
Price and paperwork. The design is priced line by line, and we submit the planning and building control applications.
We build it. Work follows an agreed programme, with inspections at each stage and a final sign-off.

Questions about a mansard loft conversion in County Antrim

How much does a mansard loft conversion cost?

Typically £65,000 to £110,000 including VAT, depending on whether one or both roof slopes are rebuilt.

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 Antrim?

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 Antrim.