House extensions · Sevenoaks
House Extensions in Sevenoaks
We design and build house extensions across Sevenoaks and the surrounding villages, from a rear extension on a period home in the town to a larger addition on a family house out in the Weald. One team handles the design, the planning, the building regulations and the build, so you deal with the same people from the first visit to the finished room.
Your detailed quotation
Priced line by line, before you commit
Free site visit, no obligation · Same working day reply
Essex
Rear extension
Detailed quotations
Itemised before work starts
The price we quote
is the price you pay
Director-led
Every project overseen by Jason Berry
On schedule
Agreed timeline, kept
House extensions in Sevenoaks
Sevenoaks is one of the most protected places to build in Kent, and that is exactly where experience earns its keep. Nearly all of the district is Green Belt, much of it also sits in a National Landscape, and there are dozens of conservation areas. Getting an extension through here takes more than a good design. It takes knowing how the rules work.
Thinking about extending your Sevenoaks home?
Talk to a Sevenoaks builder about your extension The first visit is free and there is no obligation to go ahead. We will look at what is possible on your property, talk through your ideas, and give you honest advice on the planning as well as the build. Call 07920 731533 · Request a callback
Why homeowners choose us
Why homeowners here choose us
One team runs the job from start to finish. We handle the planning and the building regulations. Our quotes are itemised. Most of our work comes through recommendation.
Matched to your home
The extensions we build in and around Sevenoaks
- Rear extensions that open the back of the house to the garden.
- Side and wrap around extensions where the plot allows.
- Double storey extensions for growing families, usually the best value per square metre.
- Kitchen extensions with bifold or sliding doors and a roof lantern for light.
- Sympathetic extensions to period, ragstone and timber framed homes, matching local materials so the work belongs.
Planning & regulations
Planning permission for an extension in Sevenoaks
This is where Sevenoaks is different, so it is worth understanding before you fall in love with a design.
Your planning authority is Sevenoaks District Council. Around 93 per cent of the district is Metropolitan Green Belt, more than 60 per cent sits within the Kent Downs National Landscape to the north or the High Weald National Landscape to the south, and there are 41 conservation areas. Very few homes here sit outside all of those.
In plain terms, three things follow:
In the Green Belt, you can still extend, but scale matters. An extension is usually acceptable as long as it is not a disproportionate addition to the original house. As a rule of thumb the council has treated additions beyond roughly half the original floor area as disproportionate, though every case is judged on its own merits.
Permitted development is reduced in the protected areas. Many houses keep some permitted development rights even in the Green Belt, but those rights are cut back in the National Landscapes and conservation areas, which between them cover much of the district. Design and materials are held to a higher standard.
Listed buildings need separate consent, and Sevenoaks has a great many of them.
None of this means you cannot get a good extension built. It means the design has to be right first time and the application has to be handled properly. We work out exactly where your property stands before you commit to anything, and we prepare and manage the application for you. Even where an extension is permitted development, almost all still need building regulations approval, which we also handle.
Building on Sevenoaks' greensand ridge
The ground here is as varied as the planning, and it changes what your foundations need to do.
Sevenoaks sits on the Greensand Ridge, a band of sandy stone that runs east to west through west Kent. It gives the town its high ground and its views, which also means many plots slope. The greensand is firm in places and softer in others, and where it meets the clay beneath, springs and damp ground can appear along the base of the ridge. To the south the ground turns to heavy Gault and Weald clay, which shrinks and swells with the seasons and moves most near mature trees.
A sloping site, a spring line or a change from sand to clay all affect how an extension is founded, and on some plots that means a ground investigation before work starts. We plan the groundwork around the site you actually have rather than assuming it is flat and uniform.
Cost, in the open
What an extension costs in Sevenoaks
Cost comes down to size, specification, ground conditions and finish, and Sevenoaks adds a couple of local factors.
Protected settings often call for higher quality materials and more design work, and sloping or spring line plots can mean more groundwork. As a general guide for this part of the South East, single storey extensions commonly run at a few thousand pounds per square metre of finished space, with double storey often better value per square metre. Treat those figures as a starting point, not a quote.
For an early estimate you can use our cost calculator. For a real, itemised figure, book a free site visit and we will price your actual project.
Want a real figure for your project? Every home and plot is different here. Book a free site visit and we will price the actual work, with a clear, itemised quote and no pressure to proceed. Call 07920 731533 · Get a free quote
How we work, from first visit to finished home
Get in touch. Call us or send the enquiry form, and we will arrange a convenient time to visit.
Free site visit. We look at the property, the plot and the ground, listen to your ideas, and talk through what is realistic in your planning setting.
Design and drawings. We develop the design, working with your architect or bringing one in.
Planning and building regulations. We prepare and manage the approvals, including the Green Belt and National Landscape considerations.
Clear quote. You get a detailed, itemised price, with no vague lump sums.
The build and handover. One managed team, director involved throughout, site kept tidy, finished properly.
Recent projects near Sevenoaks
[Real project slot. A genuine Sevenoaks or west Kent build with two or three photos and a line on the brief, ideally one that navigated Green Belt or National Landscape planning, will convert better than any amount of copy. Send one and this section gets written properly.]
[Testimonial slot. One real client quote here, with a first name and area, earns trust at the moment people decide whether to enquire.]
Want a real figure for your project?
Book a free site visit and we will price the actual work, with a clear itemised quote and no pressure to proceed.
What homeowners say
Trusted by homeowners across Kent
“From the moment he arrived he had a real professionalism and vision for what we could achieve. Jason was trustworthy and honest which made the whole build a pleasure.”
Kim and Tony, Ongar
Full house extension
Director-led
Common questions
House extension questions in Sevenoaks, answered straight
The questions every Sevenoaks homeowner asks at the first site visit.
Anything else? Call 07920 731533 and you’ll speak to Jason Berry, not a call centre.
Usually, yes. The Green Belt does not ban extensions, it limits their scale. As long as the work is not a disproportionate addition to the original house, it can normally go ahead. As a guide the council has treated additions beyond roughly half the original floor area as disproportionate, but each case is judged on its own merits, and we assess yours before you plan anything.
It depends on your property. The Kent Downs and High Weald National Landscapes and the district's conservation areas reduce permitted development rights, and the Green Belt limits scale, so more projects here need permission than in most areas. We check exactly where you stand with Sevenoaks District Council and handle any application for you.
Call us on 07920 731533 or send the enquiry form on this page. We arrange a free, no-obligation site visit, look at your home, plot and the planning position, and give you a clear, itemised written quote for the actual project.
Yes. The visit and the quote are free, and there is no pressure to go ahead. If the timing or the numbers are not right for you, that is completely fine.
Yes. Sevenoaks has a lot of period, ragstone, timber framed and listed property, and we extend and renovate it sympathetically, working with architects where needed and handling listed building consent where it applies.
The town sits on a greensand ridge, so plots often slope, the ground can vary from firm to soft, and springs can appear where the greensand meets the clay below. Heavy clay lies to the south. All of this affects how an extension is founded, so we check the ground before we start.
Sevenoaks town and the surrounding villages, including Riverhead, Dunton Green, Otford, Kemsing, Seal, Sevenoaks Weald and Westerham, plus the wider county. Call us and we will confirm your postcode.
Start your extension
Thinking about extending your Sevenoaks home?
Talk to a Sevenoaks builder about your extension The first visit is free and there is no obligation to go ahead. We will look at what is possible on your property, talk through your ideas, and give you honest advice on the planning as well as the build. Call 07920 731533 · Request a callback