Loft Conversion Chelsea

A row of red brick riverside townhouses with black railings along the Thames.

Having the Beams team on hand to manage the project and provide extra reassurance on build decisions was incredibly helpful and made the whole experience stress free.

Kerry

London

They have been extremely efficient and reassuring. It was a complex project but they took it all in their stride. They recommended very good contractors who were all punctual, polite and capable.

Andrew

London

All about trust. I felt comfortable with my money, my project, and my home knowing that the outcome would be to my satisfaction or would be made good.

Chris

London

Loft conversion experts in Chelsea

From Victorian terraces around King's Road to mansion blocks near Sloane Square, Chelsea's roofscapes vary street by street, and a conservation area setting adds an extra layer of consideration for most projects. We match you with builders who specialise in loft conversions in this kind of setting, and give you up to three like-for-like quotes to compare.

Types of loft conversion

Velux or rooflight conversions, dormer conversions, hip-to-gable conversions, and mansard conversions, which add the most headroom and floor space but usually need full planning permission. We design the option that best suits your roof shape and the constraints of your street.

Is your Chelsea loft suitable?

Suitability depends on roof type, existing head height and how a new staircase can be fitted. Chelsea's mix of Victorian and Edwardian terraces, mews houses and mansion blocks each present different challenges, from shared party walls in terraces to communal roof structures in mansion blocks, so a site survey is the first step before committing to a design.

What a loft conversion costs in Chelsea

Chelsea sits at the premium end of the London market. Based on Beams estimates for London loft conversion projects, typical fixed-price ranges look like this.

Loft type	Typical estimate
Velux or rooflight	£50,000 - £80,000
Dormer	£70,000 - £110,000
Hip-to-gable	£90,000 - £140,000
Mansard	£120,000 - £200,000+

Get up to three like-for-like quotes to compare before you commit to a builder.

Planning permission for loft conversions in Chelsea

Some loft conversions can fall under permitted development rules, but nearly three quarters of the Royal Borough of Kensington and Chelsea is covered by one of its 38 conservation areas, and some of these have Article 4 directions removing permitted development rights entirely. Mansard conversions in particular, which change the shape of the roof, generally need full planning permission across the borough. We confirm the position for your specific property before finalising a design.

How a Beams loft conversion works

1. Free estimate — tell us about your roof, space and budget.

2. Compare vetted specialists — up to three like-for-like quotes.

3. Build with confidence — fixed price, milestone payments and a 12-month warranty.

Why a loft conversion beats moving

A loft conversion adds a bedroom, office or extra living space without the cost and disruption of moving, particularly relevant in a market as expensive as Chelsea, where moving costs and stamp duty alone can be substantial.

Converting a loft in Chelsea

Chelsea covers postcodes SW3, SW10 and parts of SW1, from King's Road and Sloane Square to Cheyne Walk and Chelsea Embankment. The average property price across the Royal Borough of Kensington and Chelsea reached £1,233,000 in the year to July 2026 (provisional, ONS/HM Land Registry), and with 38 conservation areas covering much of the borough, most loft projects here need careful planning and design work before a spade goes in the ground.