West Cornwall · TR13
Extensions that reads Rinsey properly
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. The Rinsey version of this work has its own character — Rinsey is a coastal village in the TR13 area, where sea exposure, views and seasonal pressure shape most building decisions, with a building stock that leans toward granite cottages and holiday homes.
Rinsey sits in West Cornwall — covering TR13 from Praa Sands, Germoe, Truro outward.
- Cornwall AONB
- Cornish Mining World Heritage Site
- Coastal exposure zone
- ✓ Local to West Cornwall — not a national franchise
- ✓ Same team on paper as on site
- ✓ Fixed-fee planning packages, no surprise invoices
- ✓ Measured-survey accuracy from day one
Local watch-list
Local snags worth knowing before drawing a Rinsey extension.
Watch #1
AONB landscape-impact scrutiny on visible elevations
Watch #2
World Heritage Site assessment on changes visible in the mining landscape
Watch #3
Coastal exposure driving fixing, render and joinery spec
Who this is for
Rinsey 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 context
Why Rinsey is its own job.
Around Rinsey (TR13), coastal setting and landscape sensitivity mean rooflines, glazing, drainage and external materials need careful handling from the first sketch. 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; the wider area forms part of the Cornish Mining World Heritage Site, which adds a heritage assessment layer to most material changes; coastal salt-laden air around Rinsey drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure. Reading Rinsey properly up front saves more time than any drawing tool ever will. Most of our extension work in Rinsey lands on granite cottages, with detailing that has to nod to the wider Germoe streetscape.
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 Rinsey.
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
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
03
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.
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 Rinsey 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.
FAQs
Rinsey Extensions — local questions answered.
- 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. In Rinsey specifically, we'd start by checking AONB landscape sensitivity before committing to a direction.
- 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.
- 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.
- 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.
- 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.
Rinsey is part of Praa Sands
Rinsey sits inside the Praa Sands catchment — we cover both as one extension territory.
See Extensions in Praa Sands →Local proof — We typically have one or two extension jobs live in the TR13 area at any time, so the local planning officers know our drawings on sight.
Get a free feasibility viewOther services in Rinsey
Nearby places we cover
If you're considering a extension project in the TR13 area, our deep understanding of Rinsey's architectural character can help navigate the process smoothly.