House Extensions in Sevenoaks
Sevenoaks homeowners usually extend for one of two reasons: the ground floor no longer fits the way the family lives, or a move would cost more than building. Mighty Oak Construction is a family-run firm working from Tunbridge Wells, and Sevenoaks sits inside its regular patch. This page explains how an extension here is approached, from the first visit to sign off.
Extension types for Sevenoaks homes
Four layouts cover nearly every brief. A single storey rear addition pushes the kitchen or living space towards the garden. A side return fills the narrow passage beside an outrigger, widening a long and dim room. A wrap around joins both moves into one L shape. A two storey addition places bedrooms above new living space on shared foundations.
Which suits your house depends on the plot, the position of neighbouring windows and what the household is short of. A family needing a bigger kitchen and a fourth bedroom has a different answer from a couple wanting one bright room facing the garden.
Planning considerations around Sevenoaks
Much of Sevenoaks District lies within the Metropolitan Green Belt, and parts fall within the Kent Downs Area of Outstanding Natural Beauty. Those designations can limit how much a house may grow and how an addition should look. Conservation areas and Article 4 directions in parts of the district can also remove permitted development rights that would otherwise apply.
None of this means an extension is out of reach. It means the property needs checking before a design is fixed, so the drawings are aimed at a route the council can approve. Mighty Oak works with architects on drawings and with structural engineers on calculations, and building regulations approval is needed whichever planning route applies.
From survey to handover
The free site visit looks at access for materials, the ground, nearby trees and where existing drains run. Those four items decide the foundation design and are the least predictable part of any extension, which is why a figure cannot be given from photographs alone.
After drawings and approvals, groundworks and drainage come first, then the shell, coverings and glazing. Brickwork, carpentry, plastering and finishing are in-house trades. Trusted specialists handle electrical, plumbing and structural engineering work. Building control inspections run through the build and finish with a completion certificate.
What shapes the quote
Foundations and drainage are settled by the site. The size of the opening into the existing house determines how much steelwork is needed. Glazing choices, from standard doors to wide sliding sets and overhead glazing, move the number considerably. The fit out, especially a kitchen, is priced as a separate scope so you can see where the money goes.
Ask any builder you compare for a written breakdown under the same headings. A single total hides different assumptions, and those assumptions tend to reappear as extras once work has started.
Two storey or a loft instead?
Where the house needs bedrooms rather than living space, a loft conversion is often less disruptive and less contentious with planners than building up at the side or rear. Where both are needed, a two storey extension shares its foundations and covering across two floors, which makes the upper storey proportionally better value. The survey is the right moment to weigh the two.
Areas covered around Sevenoaks
Sevenoaks town and the surrounding villages listed below are covered from the Tunbridge Wells base. If your address is close by but not named, ask and the team will confirm.
- Sevenoaks
- Sevenoaks Weald
- Riverhead
- Dunton Green
- Otford
- Kemsing
- Seal
- Borough Green
Who you deal with
Mighty Oak Construction is family-run and fully insured. Founder Elliot, a third-generation craftsman, is the point of contact from the first call. The initial visit is free and leads to an itemised written quote covering the building work and any fit out as separate headings.
House Extensions in Sevenoaks: questions before commissioning
Does the Green Belt stop me extending in Sevenoaks?
Not automatically. Green Belt policy limits how much a house can grow beyond its original size, so the history of earlier additions and the proposed size both matter. The council is the authority on your property; the drawings should be aimed at what it is likely to accept.
Can I extend under permitted development in Sevenoaks?
Many houses can, within size limits. Flats, listed buildings, conservation areas and homes covered by an Article 4 direction or a restrictive condition lose some or all of those rights. Check the property before relying on them.
Is the kitchen included in an extension quote?
Only if you ask for it. Building work and fit out are quoted as separate scopes so it is clear what each covers.
Can we stay at home during the build?
Often, but it depends on how the new space joins occupied rooms and when services are interrupted. That is discussed and planned before work starts.
Do you handle building regulations?
Building control applications and inspections are part of the project, working with architects and structural engineers on the drawings and calculations they need.
Talk through your Sevenoaks extension
Book a free site visit with Elliot and receive an itemised written quote for the building work and any fit out.