West Cornwall · TR27
Connor Downs 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 Connor Downs extension in the local fabric and the rest follows — Connor Downs is a commuter village in the TR27 area, with everyday family housing, edge-of-village plots and quick routes to its parent town, with a building stock that leans toward post-war semis and older cottages.
Connor Downs sits in West Cornwall — covering TR27 from Hayle, Angarrack, Phillack outward.
- Cornish Mining World Heritage Site
- ✓ World Heritage Site experience built into the fee
- ✓ Cornwall Council regulars across every sub-area
- ✓ Free first site visit, no obligation
- ✓ Plain-English feasibility before any drawings
Who this is for
Connor Downs runs the full mix — owner-occupier, holiday-let, commercial and the occasional smallholding — so we scope every extension enquiry from the use-class up.
Local watch-list
Connor Downs-specific issues we screen on the first visit.
Watch #1
World Heritage Site assessment on changes visible in the mining landscape
Local proof — Recent extension enquiries from Connor Downs have clustered around post-war semis — we know the route through Cornwall Council on these.
Get a free feasibility viewFAQs
Connor Downs 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 Connor Downs 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.
- 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.
Local context
Why Connor Downs is its own job.
Locally, applications here usually turn on neighbour amenity, parking, overlooking and whether new work fits the rhythm of existing streets. For extension specifically, the wider area forms part of the Cornish Mining World Heritage Site, which adds a heritage assessment layer to most material changes. Which is why we scope Connor Downs projects parish-up, not template-down — the TR27 context shapes the design from day one. Whether the project is on post-war semis in the centre or further out toward Hayle, 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 Connor Downs.
01
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.
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
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
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 Connor Downs 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
Why a West Cornwall studio is the right fit for Connor Downs extension.
Building stock
Across Connor Downs (TR27) we work on post-war semis, bungalows, modern estates, older cottages, garden infill plots. Each stock type drives a different extension response — post-war semis in particular needs careful detailing here.
Parish & policy
Connor Downs sits in the parish of Connor Downs, 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 Connor Downs site visits get booked within the same week.
What does a first Connor Downs consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a TR27 plot and follow up with a written feasibility note inside a week — no obligation either way.
Request a free visitConnor Downs is part of Hayle
Connor Downs sits inside the Hayle catchment — we cover both as one extension territory.
See Extensions in Hayle →Other services in Connor Downs
Nearby places we cover
A extension in Connor Downs stands or falls on how well it reads the street — we treat that as the design brief, not an afterthought.