Cranbrook · TN17
House Extensions in Cranbrook
Serving Cranbrook & surrounding areas
Cranbrook extensions are rarely simple boxes — most of the brief is reconciling new family space with a tile-hung facade or weatherboarded rear elevation. We design extensions that read as if they were always there.
"We had our loft insulated and boarded. From start to finish the process was smooth, professional and stress-free. Malcolm upgraded the insulation and …"
House Extensions for Cranbrook homes
Why Cranbrook house extensions briefs are different
Almost every Cranbrook extension we quote sits inside the conservation area, which means cladding profiles, window proportions and rainwater goods all need to be evidenced before consent. We carry a library of matching profiles and supplier contacts to short-circuit that conversation with the planners.
Cranbrook's housing stock is dominated by Wealden hall houses, white weatherboarded cottages and Victorian brick terraces around Stone Street, with a growing pocket of 1990s and 2000s family homes towards Hartley.
Local considerations
Most of the historic core falls inside the Cranbrook Conservation Area, so even modest external changes are scrutinised — we handle the pre-application liaison with Tunbridge Wells Borough Council directly.
Wealden clay across most of the parish means foundation depths are usually 1.2–1.5m, and trees on chestnut-coppice plots almost always trigger NHBC root-influence calculations.
Extensions are where ground conditions, sightlines and neighbouring rights-of-light decisions cost real money if missed early. We front-load all three before any drawings are firmed up.
What Cranbrook clients ask for
Most clients want clarity on fixed cost, end-to-end timeline and how disruptive the kitchen-relocation period will be — we put those in writing on day one.
Recent local project
Last spring we completed a 28m² rear extension to a weatherboarded cottage off Carriers Road, reusing salvaged Kentish peg tiles on the roof to match the existing.
House Extensions on the ground in Cranbrook
The bulk of our Cranbrook extension enquiries come from the streets running off Stone Street and Carriers Road, plus the 1990s estate around Hartley where rear plots are generous but the original brick is a tricky stretcher-bond Marshalls red that's been out of production for two decades. Cottages on Quaker Lane, Frittenden Road and Wilsley Pound are almost always white-painted weatherboard over softwood frame — meaning the extension can't just be a brick box bolted on, it needs to continue the boarding in a sympathetic profile. Where the existing house backs onto agricultural land (common between Cranbrook and Sissinghurst), the rear garden depth gives us room for a deeper single-storey wrap-around than would ever be permitted on tighter Tunbridge Wells plots.
Materials and spec we use for Cranbrook house extensions
On Cranbrook conservation-area extensions we default to feather-edge sweet chestnut weatherboarding (left to silver naturally) or painted softwood in Farrow & Ball Slipper Satin or Hardwick White — both have been approved repeatedly by Tunbridge Wells heritage officers on Cranbrook streets. Roof finish is almost always handmade Kent peg tiles from Aldershaw or Tudor, laid on graded battens with lead soakers and a clay ridge. Glazing tends to be aluminium-framed slim-sightline doors painted RAL 7016 — composite or uPVC almost never gets through pre-app here. Rainwater goods are cast aluminium half-round in black; the Marley plastic systems used on most new builds will trigger a planner objection within days.
How a Cranbrook house extensions build actually runs
Cranbrook builds run more smoothly when we sequence the noisy works (breaking out, structural opening, scaffold) around the High Street's Tuesday and Saturday market days — getting plant in and out is much easier mid-morning on a Wednesday. Skip permits from Tunbridge Wells Borough Council usually take 7–10 working days for the conservation-area streets, so we apply at survey stage rather than waiting for a start date. We always notify neighbours in writing two weeks before scaffold goes up; Cranbrook is a small town and most of our clients still see their neighbours at the Vestry or the George Hotel, so a smooth party-wall conversation matters as much as the legal award itself.
Realistic cost and timeline for house extensions in Cranbrook
A standard 25–35m² single-storey rear extension in Cranbrook typically lands at £85,000–£135,000 plus VAT (2026 prices), and runs 14–18 weeks on site from groundworks to handover. Two-storey rear extensions are £150,000–£220,000 over 20–26 weeks. The factors that push Cranbrook jobs up the band are matched Kentish peg tiles (around £4,500 extra over standard interlocks on a typical pitched roof), feather-edge sweet chestnut cladding (£8,000–£12,000 over render or brick), and any structural steel where original timber frames need preserving rather than removing — a common requirement on the Wealden hall houses around the church.
Our process
How a house extensions project in Cranbrook runs
- Step 1
Free site visit & feasibility
We walk the property, measure boundaries, check drainage runs and explain what permitted development will and won't cover.
- Step 2
Concept design
Hand-sketched layouts that test 2–3 different footprints before we commit to drawings.
- Step 3
Planning & building regs
We manage the application in-house, including neighbour consultation and the lawful development certificate where needed.
- Step 4
Structural & MEP coordination
Engineer calcs, party wall awards and an early conversation with your electrician and plumber before we break ground.
- Step 5
Build & handover
One site manager from groundworks to snagging, with a written 5-year workmanship guarantee on completion.
Local coverage
Nearby villages, districts and neighbourhoods we cover from Cranbrook
We deliver house extensions projects across Cranbrook and the surrounding parishes — typically reachable within 20 minutes of our crew vans.
- Sissinghurst
- Hartley
- Wilsley Pound
- Glassenbury
- Iden Green
- Golford
Don't see your village listed? We almost certainly still cover it — get in touch.
FAQs
House Extensions in Cranbrook — frequently asked
Will an extension affect my listing or conservation status?
It can — we always submit a pre-application to TWBC for conservation-area properties so any sensitivities are flagged before drawings are firmed up.
Can you match Kentish weatherboarding?
Yes. We've sourced and installed both painted softwood and natural sweet-chestnut weatherboarding on Cranbrook extensions, including feathered profiles to match originals.
Do I need building regulations approval as well as planning?
Almost always. Planning approves the principle; building regs approve the construction detail. We submit the building regs application in parallel with planning to save 6–8 weeks.
How long does a single-storey extension take to build?
From breaking ground to handover is typically 14–18 weeks for a 25–35m² rear extension, including weather-tight shell at week 6–7 and fit-out from week 10.
Are you actually local to Cranbrook?
Yes — our workshop is in Biddenden, a short drive away, so templating, fitting and snagging visits are easy to arrange and carry no distance charge.
Do you handle planning applications for Cranbrook properties?
Yes — we submit planning and building regs applications direct with the Tunbridge Wells Borough Council, including pre-application meetings, neighbour consultations and lawful development certificates where relevant.
Popular project combinations
Often paired with house extensions in Cranbrook
Clients who book house extensions in Cranbrook often combine it with one of these services for a more complete transformation.
Loft Conversions
A natural pairing for house extensions — most Cranbrook clients have us quote both at the same survey to save a second visit.
View serviceBespoke Kitchens
A natural pairing for house extensions — most Cranbrook clients have us quote both at the same survey to save a second visit.
View serviceKitchen Refurbishments
A natural pairing for house extensions — most Cranbrook clients have us quote both at the same survey to save a second visit.
View serviceAlso available nearby
House Extensions in nearby towns
In short
For house extensions in Cranbrook (TN17), Tembok delivers a single accountable team, a fixed-price written quote and a 5-year workmanship guarantee. If you're weighing up an extension in Cranbrook, we'll come out, measure up and tell you in plain English what the conservation officer is likely to accept.
Ready to price your house extensions in Cranbrook?
Free site visit, fixed-price written quote and a 5 year workmanship guarantee — backed by 40+ years on the tools and our workshop in Biddenden.
"We had our loft insulated and boarded. From start to finish the process was smooth, professional and stress-free. Malcolm upgraded the insulation and …"
Let's Talk
Ready to start your Cranbrook project?
One team, one quote, one point of accountability — from design through to handover.