South Cornwall · TR3
Devoran 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 Devoran extension in the local fabric and the rest follows — Devoran is a former mining and shipping village on the Restronguet Creek, AONB-designated, with a tight Conservation Area along the old quay and a strong period property market, with a building stock that leans toward miners' terraces and modern infill on smaller plots.
Devoran sits in South Cornwall — covering TR3 from Feock, Perranwell Station, Carnon Downs outward.
- Conservation Area
- Cornwall AONB
- Coastal exposure zone
- Rural / open-countryside policy area
- ✓ Cornwall Council regulars across every sub-area
- ✓ Free first site visit, no obligation
- ✓ Plain-English feasibility before any drawings
- ✓ 30+ years of Cornwall Council approvals
Local proof — We typically have one or two extension jobs live in the TR3 area at any time, so the local planning officers know our drawings on sight.
Get a free feasibility viewLocal context
Why Devoran is its own job.
Locally, conservation Area covers the village along the creek; AONB and Heritage Coast across the parish. Mining heritage and quay-side material expectations apply. For extension specifically, parts of Devoran sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape; 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 Devoran drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure; 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. Which is why we scope Devoran projects parish-up, not template-down — the TR3 context shapes the design from day one. Whether the project is on miners' terraces in the centre or further out toward Playing Place, 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 Devoran.
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
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
03
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
04
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.
Our process
How a Devoran 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 TR3.
Building stock
Across Devoran (TR3) we work on miners' terraces, Victorian quay-side villas, Edwardian houses, modern infill on smaller plots. Each stock type drives a different extension response — miners' terraces in particular needs careful detailing here.
Parish & policy
Devoran sits in the parish of Feock, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover TR3 from our studio, with regular extension jobs also running in Feock, Perranwell Station, Carnon Downs. Most Devoran site visits get booked within the same week.
What does a first Devoran consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a TR3 plot and follow up with a written feasibility note inside a week — no obligation either way.
Request a free visitFAQs
Devoran Extensions — local questions answered.
- 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. In Devoran specifically, we'd start by checking the Conservation Area boundary 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.
- 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.
- 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.
Devoran is the hub for these neighbourhoods
We run extensions across Devoran and the surrounding TR3 neighbourhoods — same studio, same site team.
Other services in Devoran
Nearby places we cover
Local neighbourhoods in Devoran
A extension in Devoran stands or falls on how well it reads the street — we treat that as the design brief, not an afterthought.