House Extension Cost in Tunbridge Wells — 2026 Prices
A typical house extension in Tunbridge Wells runs £42,000–£120,000 all-in based on quotes we've written over the past two years across the TN1, TN2, TN3, TN4 postcodes. The mid-range — roughly £48,300–£102,000 — is where most Tunbridge Wells projects land once spec, finish level and structural complexity settle.
Our Biddenden yard is 17 miles (~35-minute drive) from Tunbridge Wells, so we don't carry distance loadings into Tunbridge Wells quotes the way a London or coast-based contractor would. That alone is usually 8–12% off the headline number.
Below is the cost breakdown we use in every written Tunbridge Wells quote — labour, materials, structural, finishes and a contingency line. No "from £X" headline pricing.
What drives house extension cost in Tunbridge Wells
Tunbridge Wells's typical housing stock — Pantiles Georgian terraces, Victorian villas, Edwardian semis — has a big effect on cost. Conservation overlays around The Pantiles can push joinery and roofing spec up by 10–15% because of matching tile, lime mortar or sash detailing.
- • Structural complexity (RSJs, foundations, knock-throughs)
- • Conservation / Article 4 detailing on listed or near-listed stock
- • Spec of kitchen, bathroom, joinery and flooring
- • Access — terrace, narrow lane, off-street parking
- • Whether you stay on site or move out
Itemised cost breakdown
Every Tunbridge Wells house extension quote we send breaks down into these lines so you can compare like-for-like with other builders.
- • Site set-up, scaffold, skip, welfare — £1,680–£6,000
- • Structural & foundations — £7,560–£26,400
- • Shell, roofing, glazing — £9,240–£31,200
- • M&E (plumbing, electrics, heating) — £5,040–£18,000
- • Joinery, kitchen / bathroom, finishes — £11,760–£38,400
- • Contingency (10%) — held back, not spent unless needed
Get a real house extension price for your Tunbridge Wells property
Free site visit, written itemised quote within 5 working days. No "from" pricing — actual numbers for your address.
Tunbridge Wells cost FAQs
Is Tunbridge Wells more expensive than other parts of Kent for a house extension?
Marginally — Tunbridge Wells's TN1, TN2, TN3, TN4 postcode runs about 3–6% above the Kent average, mostly because of conservation detail and parking constraints near The Pantiles. The biggest cost variance is still spec, not postcode.
Will you provide a fixed-price quote or estimate?
Fixed-price written quote — itemised across the lines above, with a 10% contingency you only pay if it's actually used. We've worked on Mount Ephraim and surrounding Tunbridge Wells streets so we price from real local knowledge, not desktop assumptions.
What's the deposit and payment schedule?
10% on contract signing, then stage payments tied to milestones (slab down, weathertight, first fix, second fix, completion). Final 5% retained for 4 weeks post-handover.
Do you include VAT in quotes?
Yes — every Tunbridge Wells quote is VAT-inclusive. We're VAT-registered. Some listed-building work in Tunbridge Wells qualifies for reduced-rate VAT; we'll flag this if applicable.
Related guides
In short
Most house extension projects in Tunbridge Wells land between £48,300–£102,000 all-in. The fastest way to get a real number for your TN1, TN2, TN3, TN4 address is a 30-minute site visit followed by an itemised written quote.