Our services

Loft Conversions

A loft conversion is one of the smartest ways to add a bedroom, studio or quiet suite to a London home, using space you already own. MVV designs and builds dormer, mansard and hip-to-gable loft conversions across West, South West, North West, Central and South East London, combining considered architectural design with precise construction to bring the room to life.

Quality and sustainability

We hold every loft conversion to high standards of safety and craftsmanship, and we build responsibly, choosing materials and methods that keep the work efficient and the carbon footprint low. The result is a space you will value for years to come.

How much does a loft conversion cost in London?

On typical London jobs priced on our estimator in October 2026, all ex VAT: rear dormer loft conversions land between £68,000 and £81,000. One forming a bedroom and shower room, about 20 m² of new floor at a high specification, priced at around £70,000, and a larger one with an en suite, about 28 m² of new floor at a standard specification, priced at around £78,000. Both include party wall matters and a new stair, and both price windows, rooflights, sanitaryware and tiles for fitting only, with the products supplied by you. Rooflight conversions usually cost less than a dormer; mansard and hip to gable conversions usually cost more. The rest depends on the roof space, the type of conversion and the specification, which is why the instant estimator prices yours in minutes and sends a realistic range to your inbox. Figures are indicative.

How long a loft conversion takes

A loft conversion typically takes between eight and sixteen weeks, covering design, planning, construction and finishing, depending on the type and complexity of the scheme.

Planning permission

Most loft conversions need planning permission, though some fall under permitted development depending on the borough. We manage the application for you and submit the documentation your local authority requires for a smooth approval.

Choosing the right loft conversion

Dormer, mansard and hip-to-gable conversions each suit different roofs. We assess your loft and help you choose the option that best fits your budget, the look you want and the structure you are working with.

Adding value to your property

A loft conversion can add real value to a London home without giving up any garden. By adding genuinely usable living space, it lifts the whole property and its appeal to future buyers.

A full design and build service

We deliver loft conversions as a complete design and build service in London, from first concept and planning through construction to the final finishes, with one accountable team throughout.