North Cornwall · PL34
House extension costs in Tintagel — what PL34 homeowners actually pay
Most Tintagel cost questions land in the same bracket: a single-storey rear sits roughly £2,200–£2,800/m² built, a two-storey side runs £2,000–£2,500/m², and anything touching a coastal elevation tends to add 8–12% for materials and detailing. We quote on measured drawings, not guesses. Extensions are the bread and butter of Cornish homes — adding the kitchen-diner the original layout never had, the bedroom for a growing family, or the light and views the back of the house should always have had. The Tintagel version of this work has its own character — Tintagel sits above a famously dramatic stretch of north coast cliff, with the medieval and Arthurian-associated castle on its headland and a Conservation Area covering the village centre, with a building stock that leans toward Victorian guesthouses and modern coastal new builds and replacements.
Tintagel sits in North Cornwall — covering PL34 from Boscastle, Delabole outward.
- Conservation Area
- Cornwall AONB
- Coastal exposure zone
- Rural / open-countryside policy area
- ✓ Typical Tintagel single-storey rear: £55k–£85k build cost
- ✓ Two-storey side extension: £85k–£140k build cost
- ✓ Wrap-around / L-shaped: £110k–£180k build cost
- ✓ Design + planning + building regs fee from £4,800 (fixed)
Our process
How a Tintagel extension project runs.
Step 1
Brief
We meet on site, talk through how you live now and what's missing from the current layout.
Step 2
Design
Two or three sketch directions with rough budgets, then refinement of the chosen route.
Step 3
Approvals
Planning or Cert of Lawfulness, then a full building regs package.
Step 4
Build
Either through your own builder with our drawings, or as a full build by our team.
Step 5
Handover
Snag, certify, hand over the keys to your new space.
Typical single-storey rear extensions run twelve to twenty weeks on site; two-storey and wraparound projects sixteen to thirty weeks.
Local proof — We typically have one or two extension jobs live in the PL34 area at any time, so the local planning officers know our drawings on sight.
Get a free feasibility viewWhat we focus on
Extensions considerations specific to Tintagel.
01
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
02
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
03
Extensions over a certain proportion of the original house trigger full Part L upgrade obligations to the existing building — worth knowing before brief is set.
04
Permitted development for rear extensions runs to four metres on a detached house, three on a semi or terrace — but Article 4 areas remove this in some parishes.
Local context
Why Tintagel is its own job.
Around Tintagel (PL34), conservation Area covers the village; AONB and Heritage Coast across the parish. English Heritage and historic landscape considerations weigh on village-edge schemes. For extension specifically, parts of Tintagel sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape; the surrounding landscape falls inside the Cornwall Area of Outstanding Natural Beauty, so massing, height and landscape impact carry extra weight in any planning decision; coastal salt-laden air around Tintagel drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure; Cornwall Council's Local Plan applies tighter tests to isolated rural dwellings here, so design rationale and policy fit need to be set out clearly from the outset. Reading Tintagel properly up front saves more time than any drawing tool ever will. Most of our extension work in Tintagel lands on Victorian guesthouses, with detailing that has to nod to the wider Delabole streetscape.
Planning note
Most extensions in Cornwall are either permitted development or a straightforward householder application — but Conservation Area and AONB sites need a more careful design conversation upfront.
Local watch-list
The PL34 constraints that shape a extension brief.
Watch #1
Conservation Area material and fenestration controls in central Tintagel
Watch #2
AONB landscape-impact scrutiny on visible elevations
Watch #3
Coastal exposure driving fixing, render and joinery spec
Watch #4
Tighter Local Plan tests on isolated rural dwellings
Tintagel is the hub for these neighbourhoods
We run extensions across Tintagel and the surrounding PL34 neighbourhoods — same studio, same site team.
Local fabric
What sets a Tintagel extension brief apart.
Building stock
Across Tintagel (PL34) we work on slate cottages, Victorian guesthouses, 1960s estate housing, modern coastal new builds and replacements. Each stock type drives a different extension response — Victorian guesthouses in particular needs careful detailing here.
Parish & policy
Tintagel is its own town in North Cornwall, with planning history that's specific to the PL34 catchment.
Coverage
We cover PL34 from our studio, with regular extension jobs also running in Boscastle, Delabole, Camelford. Most Tintagel site visits get booked within the same week.
Do you work in Tintagel regularly?
Yes — Tintagel and the wider PL34 catchment are core territory. We're typically on a North Cornwall site at least once a week, so logistics are baked in, not bolted on.
Request a free visitWho this is for
Tintagel runs the full mix — owner-occupier, holiday-let, commercial and the occasional smallholding — so we scope every extension enquiry from the use-class up.
FAQs
Tintagel Extensions — local questions answered.
- What's the average cost of a single-storey extension in Tintagel?
- For a typical 20–30m² rear extension in Tintagel (PL34) we'd expect £55k–£85k including VAT, depending on glazing spec and whether the kitchen is being reworked. Coastal exposure here pushes weather-tightness specs up, which is real money.
- Do extension costs in Tintagel include planning and building regs?
- Our fixed-fee design package covers measured survey, planning drawings, building regs and a tendered cost plan. Build cost is separate and quoted from drawings — never guessed from a phone call.
- What pushes a Tintagel extension over budget?
- Three things: ground conditions you didn't survey for, a planning condition that drives a material change, and "while we're at it" scope creep. We screen all three at feasibility stage so the number you start with is the number you finish on.
- How much does an extension cost in Tintagel?
- Build costs in Cornwall typically run from around £2,200 to £3,200 per square metre for a good-quality single-storey extension, more for kitchen-grade fit-out or complex glazing. We give a realistic budget before drawings start, not after. In Tintagel specifically, we'd start by checking the Conservation Area boundary before committing to a direction.
- Can you handle the build as well as the design?
- Yes — that's the whole point of the studio. One contract, one point of contact, no finger-pointing between architect and builder when something needs a decision on site.
- What about the Party Wall Act?
- If you share a wall with a neighbour or build close to a boundary, the Act applies. We flag it early, recommend a surveyor and keep the programme aligned with the notice period.
Other services in Tintagel
Nearby places we cover
If you're scoping an extension in Tintagel, the honest number depends on three things: ground conditions, finish level and how much of the existing fabric stays. We'll tell you which bracket you're in before you commit to a fee.
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