West Cornwall · TR27 · Cornwall Council West
Design, planning and build for Gwinear extension
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. A TR27 site visit comes before a Gwinear sketch, every time — Gwinear is a rural parish in the TR27 area, with farmsteads, lanes and scattered homes defining its built character, with a building stock that leans toward smallholdings and rural cottages.
Gwinear sits in West Cornwall — just off the A30; covering TR27 from Hayle, Angarrack, Phillack outward.
- Rural / open-countryside policy area
- ✓Plain-English feasibility before any drawings
- ✓Fixed-fee planning packages, no surprise invoices
- ✓Measured-survey accuracy from day one
- ✓One studio — design, planning and build under one roof
Free · No obligation
Free Gwinear feasibility call
Tell us about your extension. We reply within 1 working day — no obligation.
Local proof — We typically have one or two extension jobs live in the TR27 area at any time, so the local planning officers know our drawings on sight.
Get a free feasibility viewLocal context
Why Gwinear is its own job.
Cornwall Council's lens on Gwinear is consistent: open-countryside policy, access lanes, drainage and agricultural building history all need to be addressed before drawings go too far. For extension specifically, Cornwall Council's Local Plan applies tighter tests to isolated rural dwellings here, so design rationale and policy fit need to be set out clearly from the outset. That's why we treat every Gwinear project as a TR27-area job first — not a generic Cornwall job with a postcode bolted on. The smallholdings that dominate Gwinear (and continue out toward Phillack) set the tone for any extension scheme here.
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 Gwinear.
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
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
03
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
04
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
Page purpose
Drawings only, or drawings through to handover in Gwinear?
Both routes are open on a TR27 project, and the honest answer depends on whether you already have a builder you trust. Plenty of Gwinear 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 TR27 scope, not as one opaque figure
Scope
Where our work starts and stops on a TR27 project
Not every project needs every stage. On a Gwinear job we scope to what the site and the consent route actually require.
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.
Construction and technical drawings
1:10 and 1:20 details for the parts of the job builders normally have to guess at.
Who this is for
Our footing in West Cornwall
- Applications for Gwinear 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 Gwinear 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.
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
Related TR27 pages
Gwinear is covered from our Hayle 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.
Our process
How a Gwinear 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.
Quick check
Want a straight answer on whether your Gwinear 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.
Free · No obligation
Get a free feasibility view
For projects in Gwinear and the TR27 area.
Local fabric
Why a West Cornwall studio is the right fit for Gwinear extension.
Building stock
Across Gwinear (TR27) we work on farmhouses, converted barns, rural cottages, smallholdings, scattered modern homes. Each stock type drives a different extension response — smallholdings in particular needs careful detailing here.
Parish & policy
Gwinear sits in the parish of Gwinear, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover TR27 from our studio, with regular extension jobs also running in Hayle, Angarrack, Phillack. Most Gwinear site visits get booked within the same week.
How quickly can you visit a Gwinear site?
Usually within the same week. Gwinear (TR27) is on our regular West Cornwall run, alongside Hayle, Angarrack, Phillack. First visits are free and you'll get an honest feasibility view inside seven days.
Request a free visitFAQs
Gwinear Extensions — local questions answered.
- 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 Gwinear specifically, we'd start by checking the latest parish-level planning history before committing to a direction.
- Do I need planning permission for an extension?
- Often no — single-storey rear extensions, side extensions and modest two-storey additions can sit inside permitted development on a typical detached house. Conservation Areas, AONB and Article 4 zones remove some of those rights, so we always check the address first.
- 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.
- 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.
- We live in the house. Can a extension in Gwinear 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 Gwinear are often easier if you move out for a few weeks. We set that expectation at feasibility stage rather than halfway through.
- 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.
Gwinear is part of Hayle
Gwinear sits inside the Hayle catchment — we cover both as one extension territory.
See Extensions in Hayle →Other services in Gwinear
Nearby places we cover
For Gwinear homeowners weighing up a extension, the right starting point is honest feasibility — that's what we lead with, before any drawings. converted barns in particular need a tailored structural answer.
Book a site visit in the TR27 area Truro handles the planning end for TR27.
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Book a free visit in Gwinear
No obligation. Reply usually same working day.