North Cornwall · PL28 · Cornwall Council North
House extension costs in Padstow — what PL28 homeowners actually pay
Most Padstow 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. Padstow sits in North Cornwall, and that geography ends up in the drawings — Padstow is a working fishing harbour on the Camel Estuary, AONB-designated, with one of the strongest period property markets in Cornwall and a tight Conservation Area covering the inner harbour, with a building stock that leans toward modern coastal homes at Trevone and Trethillick and Georgian harbour terraces.
Padstow sits in North Cornwall — just off the A389; with Truro the closest city; 5 miles from Wadebridge.
- Conservation Area
- Cornwall AONB
- Coastal exposure zone
- ✓ Typical Padstow 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)
Local watch-list
What usually catches extension projects out in Padstow.
Watch #1
Cornwall AONB and Heritage Coast across the whole peninsula
Watch #2
Principal residence sentiment from the parish on new dwellings
Watch #3
Tight medieval lanes around the harbour limiting site logistics
Watch #4
Granite-and-slate vernacular controls on visible elevations
Who this is for
Padstow runs the full mix — owner-occupier, holiday-let, commercial and the occasional smallholding — so we scope every extension enquiry from the use-class up.
Local context
Why Padstow is its own job.
Two things shape a Padstow application: parish character and policy. On policy — conservation Area is extensive, with most of the historic core protected. Padstow's Neighbourhood Plan operates a strong principal residence policy; second homes and holiday lets face explicit policy resistance. For extension specifically, parts of Padstow 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 Padstow drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure. Get that local reading right and the rest of the Padstow programme tends to run on time. On modern coastal homes at Trevone and Trethillick in particular — the kind you'll also find toward Constantine Bay — the extension brief always has to read the existing fabric first.
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.
What we focus on
Extensions considerations specific to Padstow.
01
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.
02
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.
03
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
04
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
Recent work nearby
Recent harbour-adjacent townhouse refurb hid services in a new internal core and freed the principal rooms.
See more recent North Cornwall work →Our process
How a Padstow 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.
FAQs
Padstow Extensions — local questions answered.
- What's the average cost of a single-storey extension in Padstow?
- For a typical 20–30m² rear extension in Padstow (PL28) 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 Padstow 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 Padstow 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 Padstow?
- 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 Padstow 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.
Padstow is the hub for these neighbourhoods
We run extensions across Padstow and the surrounding PL28 neighbourhoods — same studio, same site team.
- St Eval
PL27
- Trevone
PL28
- Harlyn
PL28
- St Merryn
PL28
- Constantine Bay
PL28
- Treyarnon
PL28
- Porthcothan
PL28
- Little Petherick
PL27
Local proof — Most Padstow homeowners come to us after a extension quote elsewhere felt vague on planning — we lead with feasibility instead.
Get a free feasibility viewOther services in Padstow
Nearby places we cover
Local neighbourhoods in Padstow
If you're scoping an extension in Padstow, 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.