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
- ✓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)
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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
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.
Scope
The parts of the job we can take on in Newquay
These stages can be bought separately. Most TR7 projects use three of them.
Full design and build
One contract from first sketch to handover, with the same team on paper and on site.
Construction and technical drawings
1:10 and 1:20 details for the parts of the job builders normally have to guess at.
Building regulation drawings
Full Plans sets with sections, construction notes and coordinated structural information.
Planning application drawings
Existing and proposed plans, elevations, site and block plans drawn to validation standard.
Measured survey
An accurate record of what is actually there, which is where most avoidable cost is removed.
Who this is for
What we can genuinely back up in Newquay
- Commercial and mixed-use work in Newquay tends to sit around Treloggan Industrial Estate.
- Applications for Newquay are handled through Cornwall Council, with Truro the nearest planning office we deal with regularly.
- Design and build are offered from the same studio, which means the person answering your Newquay questions has seen the detail built.
- Sites we know on the ground here include the area around Fistral Beach and Pentire headland.
Planning rules change and every site is different. For the final position on your address, check with Cornwall Council as the local planning authority or the Planning Portal.
Keep reading
Other work we do around Newquay
We cover Newquay and the wider TR7 district directly. Extensions enquiries here are common enough that we know the constraints before the first visit.
Page purpose
Drawings only, or drawings through to handover in Newquay?
Both routes are open on a TR7 project, and the honest answer depends on whether you already have a builder you trust. Plenty of Newquay clients take the drawings, tender them locally, then come back to us for the build if the numbers do not stack up.
- Route one: feasibility, planning and a tender-ready technical pack
- Route two: the same pack, then the build under one contract
- Either way the survey and feasibility work is identical, so the decision can wait
- Fees quoted per stage against the TR7 scope, not as one opaque figure
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. On older stock, the practical constraint is usually joinery, render and roof line rather than the extension itself. We draw those details out early so an extension submission is not sent back for missing information. Confirm listing status with the local planning authority before assuming permitted development. Exposure is the real design driver near the water: wind-driven rain, salt and driving damp push detailing towards better weathering, sheltered openings and robust fixings. Where an AONB or coastal policy applies, visual impact usually carries more weight than size.
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 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.
Quick check
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Send a few details — we'll come back within 1 working day with a plain-English view on planning risk, likely cost band and whether it's a project we'd take on.
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For projects in Newquay and the TR7 area.
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 →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.
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.
- We live in the house. Can an extension in Newquay be done while we stay put?
- Usually yes for single-storey and rear work, with a temporary kitchen or bathroom arrangement agreed before the start. Whole-house remodels and roof work in Newquay are often easier if you move out for a few weeks. We set that expectation at feasibility stage rather than halfway through.
- 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.
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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