West Cornwall · TR13
Design, planning and build for Godolphin Cross 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 TR13 site visit comes before a Godolphin Cross sketch, every time — Godolphin Cross is a former mining settlement in the TR13 area, with granite terraces, chapel buildings and industrial landscape character still visible, with a building stock that leans toward miners cottages and post-war estates.
Godolphin Cross sits in West Cornwall — covering TR13 from Helston, Breage, Ashton outward.
- Cornwall AONB
- Cornish Mining World Heritage Site
- Rural / open-countryside policy area
- ✓ AONB experience built into the fee
- ✓ 30+ years of Cornwall Council approvals
- ✓ Same team on paper as on site
- ✓ Fixed-fee planning packages, no surprise invoices
Local proof — Most Godolphin Cross homeowners come to us after a extension quote elsewhere felt vague on planning — we lead with feasibility instead.
Get a free feasibility viewLocal context
Why Godolphin Cross is its own job.
Cornwall Council's lens on Godolphin Cross is consistent: mining heritage, old plot widths and traditional materials make proportion and detailing more important than generic extension templates. 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; 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 Godolphin Cross project as a TR13-area job first — not a generic Cornwall job with a postcode bolted on. The miners cottages that dominate Godolphin Cross (and continue out toward Ashton) 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 Godolphin Cross.
01
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
02
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
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
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 Godolphin Cross 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 Godolphin Cross extension.
Building stock
Across Godolphin Cross (TR13) we work on miners cottages, granite terraces, chapel conversions, workers cottages, post-war estates. Each stock type drives a different extension response — miners cottages in particular needs careful detailing here.
Parish & policy
Godolphin Cross sits in the parish of Godolphin Cross, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover TR13 from our studio, with regular extension jobs also running in Helston, Breage, Ashton. Most Godolphin Cross site visits get booked within the same week.
How quickly can you visit a Godolphin Cross site?
Usually within the same week. Godolphin Cross (TR13) is on our regular West Cornwall run, alongside Helston, Breage, Ashton. First visits are free and you'll get an honest feasibility view inside seven days.
Request a free visitFAQs
Godolphin Cross 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 Godolphin Cross specifically, we'd start by checking AONB landscape sensitivity 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.
- 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.
- 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.
Godolphin Cross is part of Helston
Godolphin Cross sits inside the Helston catchment — we cover both as one extension territory.
See Extensions in Helston →Other services in Godolphin Cross
Nearby places we cover
Most Godolphin Cross extension enquiries start with one honest conversation about what's actually allowed — and that conversation costs nothing.