North Cornwall · TR7 · Cornwall Council North
Porth extension — feasibility first, drawings second
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. Anchor any Porth extension in the local fabric and the rest follows — Porth is a holiday-coast settlement in the TR7 area, with strong second-home demand and exposed coastal building conditions, with a building stock that leans toward second homes and coastal bungalows.
Porth sits in North Cornwall — just off the A39; covering TR7 from Newquay, Cubert, Holywell Bay outward.
- Coastal exposure zone
- ✓Free first site visit, no obligation
- ✓Plain-English feasibility before any drawings
- ✓30+ years of Cornwall Council approvals
- ✓coastal exposure experience built into the fee
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Free Porth feasibility call
Tell us about your extension. We reply within 1 working day — no obligation.
Who this is for
In Porth 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
What usually catches extension projects out in Porth.
Watch #1
Exposure detailing on coastal bungalows — fixings, render systems and joinery specified for salt-laden air
Watch #2
Trussed roofs and shallow foundations in the later TR7 estates, which change the structural strategy
Local proof — Most Porth homeowners come to us after a extension quote elsewhere felt vague on planning — we lead with feasibility instead.
Get a free feasibility viewFAQs
Porth Extensions — local questions answered.
- 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. In Porth specifically, we'd start by checking the latest parish-level planning history before committing to a direction.
- 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.
- 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.
- We live in the house. Can a extension in Porth 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 Porth are often easier if you move out for a few weeks. We set that expectation at feasibility stage rather than halfway through.
- 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.
Quick check
Want a straight answer on whether your Porth 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 Porth and the TR7 area.
Who this is for
Why this page exists, and who it is for
- Design and build are offered from the same studio, which means the person answering your Porth questions has seen the detail built.
- Drawings, planning and building regulations are all produced in-house, so a extension enquiry does not get passed between firms.
- Applications for Porth 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.
Keep reading
Follow the chain: survey, drawings, build
Porth is covered from our Newquay run. Being a smaller place, the local detail matters more than the headline policy: lane access, neighbour proximity and what the immediate street already looks like.
Page purpose
Drawings only, or drawings through to handover in Porth?
Both routes are open on a TR7 project, and the honest answer depends on whether you already have a builder you trust. Plenty of Porth 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
Scope
What we can draw, survey and build around Porth
These stages can be bought separately. Most TR7 projects use three of them.
Construction and technical drawings
1:10 and 1:20 details for the parts of the job builders normally have to guess at.
Structural coordination
Calculations coordinated with the drawings so building control sees one consistent story.
Planning application drawings
Existing and proposed plans, elevations, site and block plans drawn to validation standard.
Building regulation drawings
Full Plans sets with sections, construction notes and coordinated structural information.
Measured survey
An accurate record of what is actually there, which is where most avoidable cost is removed.
Local context
Why Porth is its own job.
Locally, planning scrutiny often focuses on visual impact, occupancy, parking, overlooking and whether replacement buildings respect the coastal edge. For extension specifically, coastal salt-laden air around Porth drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure. Which is why we scope Porth projects parish-up, not template-down — the TR7 context shapes the design from day one. Whether the project is on second homes in the centre or further out toward Newquay, the extension response is locally tuned.
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 Porth.
01
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
02
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
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
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
Our process
How a Porth 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 a extension team that actually knows TR7.
Building stock
Across Porth (TR7) we work on coastal bungalows, holiday lets, second homes, detached houses, replacement dwellings. Each stock type drives a different extension response — second homes in particular needs careful detailing here.
Parish & policy
Porth sits in the parish of Porth, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover TR7 from our studio, with regular extension jobs also running in Newquay, Cubert, Holywell Bay. Most Porth site visits get booked within the same week.
What does a first Porth consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a TR7 plot and follow up with a written feasibility note inside a week — no obligation either way.
Request a free visitPorth is part of Newquay
Porth sits inside the Newquay catchment — we cover both as one extension territory.
See Extensions in Newquay →Other services in Porth
Nearby places we cover
To sum up, our extension approach in Porth is built entirely around local Cornwall context, ensuring the best possible outcome for your property. Parish-level consultation in Porth is worth planning for, not reacting to.
One conversation — and a clearer Porth brief We know how coastal bungalows behave here.
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