Everything homeowners ask, answered.

Loft conversion costs in London typically range from £35,000 to £90,000+ depending on the type of conversion, property structure, size and specification. Dormer loft conversions are usually the most cost-effective, while mansard conversions are more premium and complex.

A Velux or rooflight loft conversion is usually the cheapest option because it requires minimal structural alterations to the roof.

Dormer and mansard loft conversions often add the most value to London properties because they create significant additional living space and bedrooms.

Many loft conversions fall under permitted development rights, but mansard lofts, front-facing dormers, conservation areas and flats may require planning permission. We handle planning applications and party wall agreements as part of every project.

Most loft conversions take between 6–12 weeks depending on the complexity, structural work and weather conditions.

Yes. Most homeowners remain in the property during the build, as much of the work is carried out through scaffolding access before the staircase is installed.

A minimum height of around 2.2m from floor to ridge is generally recommended for a practical loft conversion.

Common loft conversion types include dormer, mansard, hip-to-gable, Velux and L-shaped dormer loft conversions.

Yes. A well-designed loft conversion can significantly increase living space and potentially add 15–25% to your property value in London and the South East.

Yes. All loft conversions must comply with UK building regulations covering structural safety, insulation, fire safety, staircases and ventilation.

House extension costs vary depending on size and specification. Rear extensions in London often start from around £45,000 and increase based on finishes and structural complexity.

Rear kitchen extensions and open-plan living extensions are among the most popular options for London homeowners.

Some house extensions fall under permitted development rights, but larger extensions or properties in conservation areas may require planning approval.

Most extensions take between 8–16 weeks depending on the size, structural works and project scope.

A quality extension can significantly improve resale value, especially when creating open-plan kitchens, additional bedrooms or larger family spaces.

In many cases yes, although certain stages of the build may cause temporary disruption to kitchens or living areas.

A rear extension expands the back of the property to create more internal living space, often used for kitchens, dining areas or family rooms.

A side return extension uses the narrow side passage commonly found on Victorian and Edwardian properties to widen the ground floor.

A wraparound extension combines a rear extension with a side return extension to create a large open-plan living space.

Nest Loft & Extensions delivers architect-led loft conversions and extensions with in-house planning, structural coordination and high-quality construction across Greater London and the South East.

Yes. We provide free consultations, site surveys and no-obligation quotations for loft conversions and extension projects.

We cover Bromley, Beckenham, Chislehurst, Orpington, Hayes (Kent), Greater London and the South East of England.

Yes. We carry appropriate public liability insurance and work in accordance with UK building regulations and safety standards.

Yes. We provide support with architectural drawings, planning applications, structural engineering, building regulations and full project management.