North Cornwall · TR6 · Cornwall Council North
Two-storey extension costs in Perranporth — what TR6 homeowners really pay
A two-storey extension in Perranporth sits at £2,000–£2,500/m² built for standard finishes, rising to £2,800/m² when the existing gable needs opening up. On 1930s and 1950s coastal bungalows the biggest cost driver is almost never the shell — it's rooflines, matching stone or render, and how the new stair lands upstairs. 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. In Perranporth, that work is shaped by the place itself — Perranporth is a north coast surf village with a vast three-mile beach backed by Penhale Sands, a busy summer population and a planning landscape shaped by holiday-let pressure, with a building stock that leans toward 1930s and 1950s coastal bungalows and architect-designed dune-edge homes.
Perranporth sits in North Cornwall — just off the A39; covering TR6 from St Agnes, Goonhavern outward.
- Cornwall AONB
- Coastal exposure zone
- ✓Two-storey side: £90k–£150k build
- ✓Two-storey rear: £110k–£180k build
- ✓£2,000–£2,500/m² typical rate
- ✓Full planning route mapped before design fee
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Free Perranporth feasibility call
Tell us about your extension. We reply within 1 working day — no obligation.
Who this is for
In Perranporth 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.
Local watch-list
Local snags worth knowing before drawing a Perranporth extension.
Watch #1
AONB landscape-impact testing on anything read in long views across North Cornwall
Watch #2
Exposure detailing on 1930s and 1950s coastal bungalows — fixings, render systems and joinery specified for salt-laden air
Watch #3
Trussed roofs and shallow foundations in the later TR6 estates, which change the structural strategy
Local proof — Our North Cornwall workload means a Perranporth extension project never has to wait for an out-of-county team to drive down.
Get a free feasibility viewFAQs
Perranporth Extensions — local questions answered.
- Is a two-storey extension worth it in Perranporth?
- On average, yes — value uplift on TR6 stock typically covers the build cost within 3–5 years. The exception is where the existing bedroom layout won't take a new stair without losing a room.
- How much does a two-storey side extension cost in Perranporth?
- £90k–£150k for a 30–45m² double-storey side, including matching render/stone, new stair and one extra bedroom + en-suite upstairs.
- Does a two-storey extension need full planning in Perranporth?
- Usually yes — two-storey rear extensions sit outside PD limits. Full householder application, 8-week determination.
- We live in the house. Can an extension in Perranporth 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 Perranporth are often easier if you move out for a few weeks. We set that expectation at feasibility stage rather than halfway through.
- How long does the whole process take?
- Allow roughly three months for design and approvals, then twelve to twenty weeks on site for a typical single-storey extension. Wraparounds and two-storey add-ons take longer, mostly through approval and groundworks. In Perranporth specifically, we'd start by checking AONB landscape sensitivity before committing to a direction.
- Will my house be liveable during the build?
- For most rear and side extensions, yes — we sequence the works so the kitchen and one bathroom stay functional until the new build is watertight and connected.
Quick check
Want a straight answer on whether your Perranporth project is worth pursuing?
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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Get a free feasibility view
For projects in Perranporth and the TR6 area.
Scope
What we can draw, survey and build around Perranporth
These stages can be bought separately. Most TR6 projects use three of them.
Measured survey
An accurate record of what is actually there, which is where most avoidable cost is removed.
Construction and technical drawings
1:10 and 1:20 details for the parts of the job builders normally have to guess at.
Heritage and design statements
Written justification where designation makes the design case as important as the drawing.
Building regulation drawings
Full Plans sets with sections, construction notes and coordinated structural information.
Structural coordination
Calculations coordinated with the drawings so building control sees one consistent story.
Page purpose
Drawings only, or drawings through to handover in Perranporth?
Both routes are open on a TR6 project, and the honest answer depends on whether you already have a builder you trust. Plenty of Perranporth 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 TR6 scope, not as one opaque figure
Keep reading
Follow the chain: survey, drawings, build
We cover Perranporth and the wider TR6 district directly. Extensions enquiries here are common enough that we know the constraints before the first visit.
Who this is for
Why this page exists, and who it is for
- Drawings, planning and building regulations are all produced in-house, so an extension enquiry does not get passed between firms.
- Designated-area work is routine here, so heritage and landscape statements are produced alongside the drawings rather than outsourced.
- Applications for Perranporth are handled through Cornwall Council, with Bodmin the nearest planning office we deal with regularly.
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.
Local context
Why Perranporth is its own job.
The planning backdrop in North Cornwall is real, not abstract: aONB designation across the village and beach hinterland; Penhale Sands SSSI and military training area immediately to the north constrain expansion. Local plan policy on holiday lets is tightening. For extension specifically, 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 Perranporth drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure. Treat the TR6 parish brief as the design brief and the Perranporth application has somewhere to land. Whether the project is on 1930s and 1950s coastal bungalows in the centre or further out toward St Agnes, the extension response is locally tuned. 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. Salt air and prevailing wind change specification long before they change planning. We tend to draw weathering details in full, then check whether coastal or AONB policy narrows the design options for this address.
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 Perranporth.
01
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
02
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.
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
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
Our process
How a Perranporth 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 fabric
Choosing an extension team that actually knows TR6.
Building stock
Across Perranporth (TR6) we work on 1930s and 1950s coastal bungalows, Victorian terraces above the village, modern apartment developments, architect-designed dune-edge homes. Each stock type drives a different extension response — 1930s and 1950s coastal bungalows in particular needs careful detailing here.
Parish & policy
Perranporth is its own town in North Cornwall, with planning history that's specific to the TR6 catchment.
Coverage
We cover TR6 from our studio, with regular extension jobs also running in Newquay. Most Perranporth site visits get booked within the same week.
What does a first Perranporth consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a TR6 plot and follow up with a written feasibility note inside a week — no obligation either way.
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Nearby places we cover
A well-scoped two-storey extension in Perranporth nearly always beats moving house. The value is in getting the upstairs plan right in the first sketch, not the last.
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