Bespoke loft conversions across Sevenoaks, designed and built by our own in-house team. One fixed written price, a ten year guarantee, and a free design survey at your door.
In short: Loft Life designs and builds bespoke loft conversions across Sevenoaks with our own in-house team. Most Sevenoaks homes take a rear dormer, a hip to gable or an L-shape, depending on whether you have a 1930s semi, an older terrace or a larger detached house. Most take six to eight weeks on site and run from around £50,000 to £75,000 for a dormer or hip to gable. Every conversion comes with a free design survey, one fixed written price with no hidden extras, and a ten year guarantee.
Sevenoaks is an expensive place to buy another bedroom. Moving to a larger house in the TN13 or TN14 postcodes means stamp duty, agent fees and a price per square foot that makes a fourth bedroom cost far more than building one into the roof you already own. That is why so many loft conversions here are done by families who like the school, the station and the street and simply need more room. The loft is usually the cheapest square footage in the house to bring into use, because the walls, the roof and the foundations are already there.
We are always happy to show you real conversions rather than stock photography. While we build right across Sevenoaks, some of our nearest documented projects are just along the road in Beckenham, on the same kind of housing stock. Ask us on the survey and we will talk you through the ones most like your own house.
Hip to gable master bedroom, Beckenham A hipped side roof squared off into a gable to create a bright master bedroom, the kind of build we do most often on Sevenoaks semis. View project → 
Two-bedroom hip to gable, Beckenham A larger hip to gable planned as two rooms with roof windows, showing what a bigger roof can take. View project → 
Hip to gable with en-suite, Beckenham A hip to gable with new roof windows, built to take a master bedroom with its own en-suite. View project → You can see more finished rooms and the build process in our gallery.
The right conversion is decided by your roof, and Sevenoaks has more than one kind. The Victorian and Edwardian terraces and villas around the town centre and St John’s tend to be deep, with a rear back addition, which is what makes an L-shape conversion possible. Move out towards Riverhead and Dunton Green and the interwar and post-war semis usually have a hipped roof, where the space only really appears once that hip is squared off into a gable and a rear dormer is added, which is why a hip to gable is the build we do most often here. The larger detached and period homes in the leafier roads often have the head height for a straightforward dormer, or a run of rooflights that keeps the outside untouched.
| Your roof | Best conversion | Common in |
|---|---|---|
| Hipped roof, slopes on three sides | Hip to gable, usually with a rear dormer | Interwar and post-war semis around Riverhead and Dunton Green |
| Terrace or semi with a rear back addition | L-shape dormer | Victorian and Edwardian homes near the town centre and St John’s |
| Straight pitched rear roof with head height | Rear dormer | Most Sevenoaks semis and detached houses |
| Plenty of head height, want the outside untouched | Velux or rooflight | Larger period and detached homes |
None of this is guesswork on the day. We measure the head height at the ridge, look at the existing staircase and where the new one can land, and tell you honestly what is possible before any money changes hands.
Costs depend on the roof, the size and the finish, not the postcode. As a guide for Sevenoaks and the surrounding area, the ranges below are the same indicative figures shown on our loft conversion costs guide, which has an instant estimator.
| Conversion type | Indicative cost (plus VAT) |
|---|---|
| Velux | £35,000 to £50,000 |
| Dormer | £50,000 to £65,000 |
| Hip to gable | £58,000 to £75,000 |
| L-shape | £65,000 to £90,000 |
| New build loft | £45,000 to £70,000 |
Because many Sevenoaks homes are 1930s semis, the majority of conversions here are hip to gable and dormer builds, which sit in the middle of that range. What affects your own figure:
| What drives the cost | Why it matters |
|---|---|
| Conversion type | Velux is the most affordable, a dormer costs more, and a hip to gable or L-shape costs more again because they rebuild part of the roof. |
| Roof shape and head height | A hipped 1930s roof needs more structural work than a straight gable end. |
| En-suite or bathroom | Adding plumbing and a bathroom raises the cost but adds the most value. |
| Staircase position | Where the new stairs can land can change the layout and the build. |
| Finishes | Standard or higher-specification fittings change the final figure. |
There is a return on the number as well. Nationwide’s research has put the uplift from adding a bedroom and a bathroom at around 20% of a property’s value, which in Sevenoaks prices is usually a multiple of the build cost. Our guide to how much value a loft conversion adds covers it in full. Whatever the type, the price we give after the survey is fixed and written down, with staged payments through the build, so nothing creeps onto the final bill.
There are plenty of builders who will take on a loft, and fewer who specialise in them. When you compare loft conversion companies in Sevenoaks, four things separate a safe choice from a risky one: a fixed written price with no provisional sums, the firm’s own tradespeople on site rather than subcontractors, building control sign-off handled as part of the job, and a written guarantee you can actually hold them to.
Loft Life does all four. We give you one itemised price in writing before anyone starts, our own in-house team builds every job, we handle the drawings, the structural calculations and the building control sign-off, and every conversion comes with a ten year written guarantee. One named project manager runs the job from the first survey to the completion certificate, and you have their number the whole way through.
Loft conversion applications in the area go to Sevenoaks District Council. Many conversions on houses go ahead under permitted development, without a full application, as long as they stay within the size limits and the house has not already used its allowance.
What changes that is where you live. The district has more than 40 conservation areas, from Sevenoaks High Street, The Vine, Hartslands and Kippington in the town to the village areas at Riverhead, Otford, Kemsing and Seal, and much of the district sits within the Kent Downs National Landscape and the Green Belt, where permitted development rights for the roof are often tighter. A dormer that would be automatic two streets away may need a full application. Flats and maisonettes, listed buildings and anything that alters the front roof slope need an application wherever they are, and our guide to loft conversions in conservation areas and listed buildings covers how that works. We check exactly what applies to your address on the survey and handle whichever consent applies as part of the fixed price. Our planning permission guide and building regulations guide explain the rules in full.
Building regulations are separate, and they apply to every loft conversion in Sevenoaks whether or not it needs planning. They cover the new floor structure, the fire escape route and fire doors, the head height over the stairs, and the insulation, and we handle the calculations, the drawings and the sign-off as part of the job.
We build across the whole of west Kent with our own team. If you are just outside Sevenoaks we almost certainly cover you: see loft conversions in Tonbridge, Tunbridge Wells and Maidstone, every town on our loft conversions across Kent page, or the full picture on our areas we cover page.
There is no hard sell and no obligation. You book a free design survey, and we come to the house, measure the roof and tell you honestly what it will take. You then get one fixed written price for the whole conversion, so you know the number before you commit anything. If you go ahead, our own team builds it start to finish, with staged payments through the build and a ten year written guarantee at the end. If your roof will not work, we tell you that straight.
Usually no. Most rear dormers and hip to gables on houses in Sevenoaks go ahead under permitted development without a full application. The exceptions are conservation areas, listed buildings, flats and maisonettes, and anything that changes the front roof slope, which need a full application to Sevenoaks District Council. We check exactly what applies to your address on the free survey and handle any application as part of the fixed price.
It depends on the type of conversion and your roof, not your postcode. As a guide, a Velux conversion runs from around £35,000, a dormer from £50,000 to £65,000, and a hip to gable from £58,000 to £75,000, which is a common build on the 1930s semis around Riverhead and Dunton Green. These are the same indicative ranges shown on our costs page estimator, and after a free survey you get one fixed written price with no hidden extras.
Most take six to eight weeks of building work on site. A simple Velux conversion can be done in three to five weeks, and a larger dormer or L-shape runs to eight to twelve weeks. Allow another two to four weeks beforehand for design, drawings and approvals, and you get a clear timeline with your fixed quote.
Look for a fixed written price with no provisional sums, the company’s own tradespeople rather than subcontractors, building control sign-off handled as part of the job, and a written guarantee. We give you all four, with one named project manager from the first survey to the completion certificate.
Usually not. We produce the design, the drawings and the structural calculations in-house as part of the job, so for a standard dormer or hip to gable you do not need to appoint a separate architect. Where a full planning application is needed, we handle the drawings and the submission.
Most 1930s and post-war semis around Riverhead and Dunton Green have a hipped roof, so the space usually comes from a hip to gable conversion, often paired with a rear dormer. Squaring off the sloping side of the roof is what gives you full head height across the new room.
It can. Large parts of the Sevenoaks district sit within the Kent Downs National Landscape and the Green Belt, and some permitted development rights are tighter inside those areas. A rear dormer facing the garden is often still fine, but it is a street-by-street question, which is exactly what the free survey settles.
In most cases, yes. Nationwide has put the uplift from adding a bedroom and a bathroom at around 20% of a property’s value. In Sevenoaks prices that is usually well above the build cost, which is a large part of why homeowners here choose to convert rather than move.
We cover Sevenoaks with our own in-house team. We are based at 5B Hawes Road in Bromley, a short run up the A21, and the same people who survey your roof are the ones who build it. We do not subcontract the work out, which is how we stand behind the ten year guarantee on every job.
If you are in Sevenoaks and thinking about the loft, book a free design survey. We measure the roof, tell you honestly what it will take, and give you one fixed written price with no obligation.
Loft Life, 5B Hawes Road, Bromley. We cover Sevenoaks and the surrounding west Kent area. Call 0800 028 0099 or use our contact page.
Book a free, no-obligation design visit. We will tell you what your roof allows, show you what it could look like, and give you a fixed price. No pressure, no jargon.
A short conversation about the house and what you are hoping to do. No sales pitch.
We measure up and tell you honestly what your roof allows, what it would look like, and what it involves.
Itemised, with no hidden extras, and a ten-year written guarantee on the finished work.
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