West Cornwall · TR18
Gulval 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. On a Gulval site, the brief always meets the place — Gulval is a historic parish village just north-east of Penzance, with a fifteenth-century church, granite cottages around a sheltered green and views down to Mounts Bay, with a building stock that leans toward granite churchyard cottages and modern infill on field-edge plots.
Gulval sits in West Cornwall — covering TR18 from Penzance, Heamoor, Ludgvan outward.
- Conservation Area
- ✓ Plain-English feasibility before any drawings
- ✓ 30+ years of Cornwall Council approvals
- ✓ Conservation Area experience built into the fee
- ✓ Cornwall Council regulars across every sub-area
Who this is for
Gulval 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
The TR18 constraints that shape a extension brief.
Watch #1
Conservation Area material and fenestration controls in central Gulval
Local proof — Recent extension enquiries from Gulval have clustered around granite churchyard cottages — we know the route through Cornwall Council on these.
Get a free feasibility viewFAQs
Gulval Extensions — local questions answered.
- 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. In Gulval specifically, we'd start by checking the Conservation Area boundary before committing to a direction.
- 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.
- 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.
Local context
Why Gulval is its own job.
Locally, gulval Conservation Area covers the village core and church; close design scrutiny on materials and roof form. The parish has resisted large estate development in recent local plan rounds. For extension specifically, parts of Gulval sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape. Which is why we scope Gulval projects parish-up, not template-down — the TR18 context shapes the design from day one. Whether the project is on granite churchyard cottages in the centre or further out toward Long Rock, 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 Gulval.
01
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
02
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
03
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
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 Gulval 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 Gulval extension.
Building stock
Across Gulval (TR18) we work on granite churchyard cottages, Georgian rectory-era houses, Victorian villas, modern infill on field-edge plots. Each stock type drives a different extension response — granite churchyard cottages in particular needs careful detailing here.
Parish & policy
Gulval sits in the parish of Gulval, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover TR18 from our studio, with regular extension jobs also running in Penzance, Heamoor, Ludgvan. Most Gulval site visits get booked within the same week.
What does a first Gulval consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a TR18 plot and follow up with a written feasibility note inside a week — no obligation either way.
Request a free visitGulval is part of Penzance
Gulval sits inside the Penzance catchment — we cover both as one extension territory.
See Extensions in Penzance →Other services in Gulval
Nearby places we cover
From initial feasibility to final handover, we manage extension projects across Gulval with careful attention to what makes West Cornwall unique.