What's the average cost of a single-storey extension in Newquay?

For a typical 20–30m² rear extension in Newquay (TR7) 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 Newquay 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 Newquay 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.

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. In Newquay specifically, we'd start by checking the Conservation Area boundary before committing to a direction.

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.

How much does an extension cost in Cornwall?

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.

North Cornwall · TR7 · Cornwall Council Central

House extension costs in Newquay — what TR7 homeowners actually pay

Most Newquay 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 Newquay version of this work has its own character — Newquay is the principal north coast town and Cornwall's surfing capital, with seven beaches, a Victorian seaside core and a substantial twentieth-century holiday and residential expansion, with a building stock that leans toward surf-oriented architect builds at Pentire and 1930s seafront flats.

Newquay sits in North Cornwall — just off the A392; with Truro the closest city; covering TR7 from Porth, Crantock, Crackington Haven outward.

Conservation Area
Coastal exposure zone

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✓ Typical Newquay 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)

AONB landscape sloping toward the coast path

Victorian terrace with slate roof and bay window

Our process

How a Newquay 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 — Most Newquay extension clients we work with are second-time builders — they've seen the templated approach fail once already.

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What we focus on

Extensions considerations specific to Newquay.

01
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
02
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
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 Newquay is its own job.

Conservation Area covers the historic harbour and town centre. Holiday-let intensity has driven recent local policy interventions; HMO and planning conditions are common in some streets. For extension specifically, parts of Newquay sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape; coastal salt-laden air around Newquay drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure. So every Newquay job runs as a TR7-specific piece of work — local policy, local fabric, local builders. Most of our extension work in Newquay lands on surf-oriented architect builds at Pentire, with detailing that has to nod to the wider Crackington Haven 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

Local snags worth knowing before drawing a Newquay extension.

Watch #1
Pentire and Watergate Bay AONB ridge-height scrutiny
Watch #2
Wind-uplift detailing on Atlantic-facing roofs
Watch #3
Heritage Coast policy on seaward elevations
Watch #4
Holiday-let change-of-use applications under recent local policy

Newquay is the hub for these neighbourhoods

We run extensions across Newquay and the surrounding TR7 neighbourhoods — same studio, same site team.

Local fabric

Newquay extensions — the local-studio difference.

Building stock

Across Newquay (TR7) we work on Victorian and Edwardian guesthouses, 1930s seafront flats, post-war suburban estates, modern apartment blocks, surf-oriented architect builds at Pentire. Each stock type drives a different extension response — surf-oriented architect builds at Pentire in particular needs careful detailing here.

Parish & policy

Newquay is its own town in North Cornwall, with planning history that's specific to the TR7 catchment.

Coverage

We cover TR7 from our studio, with regular extension jobs also running in Porth, Crantock, Crackington Haven. Most Newquay site visits get booked within the same week.

Do you work in Newquay regularly?

Yes — Newquay and the wider TR7 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.

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Recent work nearby

Recent Pentire replacement dwelling pulled the ridge down 800mm to clear long views from the coast path.

See more recent North Cornwall work →

Who this is for

In Newquay the extension brief is almost always a private homeowner improving a forever home — so we lead with feasibility and long-term value, not show-home rhetoric.

FAQs

Newquay Extensions — local questions answered.

What's the average cost of a single-storey extension in Newquay?: For a typical 20–30m² rear extension in Newquay (TR7) 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 Newquay 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 Newquay 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.
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. In Newquay specifically, we'd start by checking the Conservation Area boundary before committing to a direction.
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.
How much does an extension cost in Cornwall?: 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.

Other services in Newquay

Nearby places we cover

Local neighbourhoods in Newquay

If you're scoping an extension in Newquay, 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.

Get a free cost-banded feasibility for your Newquay extension

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House extension costs in Newquay — what TR7 homeowners actually pay

How a Newquay extension project runs.

Brief

Design

Approvals

Build

Handover