Lizard Peninsula · TR12
One studio for extension in Helford
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. Helford sits in Lizard Peninsula, and that geography ends up in the drawings — Helford is the famous AONB hamlet at the mouth of Frenchman's Creek, with a tight Conservation Area along the waterside and a high-end period property market, with a building stock that leans toward high-end modern carefully detailed riverside homes and Victorian villas.
Helford sits in Lizard Peninsula — covering TR12 from Manaccan, Gweek outward.
- Conservation Area
- Cornwall AONB
- Coastal exposure zone
- Rural / open-countryside policy area
- ✓ Measured-survey accuracy from day one
- ✓ One studio — design, planning and build under one roof
- ✓ Conservation Area experience built into the fee
- ✓ Local to Lizard Peninsula — not a national franchise
Our process
How a Helford 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 proof — Most Helford homeowners come to us after a extension quote elsewhere felt vague on planning — we lead with feasibility instead.
Get a free feasibility viewWhat we focus on
Extensions considerations specific to Helford.
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
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.
03
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
04
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
Local context
Why Helford is its own job.
Two things shape a Helford application: parish character and policy. On policy — conservation Area covers the entire hamlet; AONB, Heritage Coast and Helford SSSI across the parish. Waterside ecology and views shape every application. For extension specifically, parts of Helford 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 Helford 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. Get that local reading right and the rest of the Helford programme tends to run on time. On high-end modern carefully detailed riverside homes in particular — the kind you'll also find toward Gweek — the extension brief always has to read the existing fabric first.
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.
Local watch-list
Helford-specific issues we screen on the first visit.
Watch #1
Conservation Area material and fenestration controls in central Helford
Watch #2
AONB landscape-impact scrutiny on visible elevations
Watch #3
Coastal exposure driving fixing, render and joinery spec
Watch #4
Tighter Local Plan tests on isolated rural dwellings
Helford is part of Manaccan
Helford sits inside the Manaccan catchment — we cover both as one extension territory.
See Extensions in Manaccan →Local fabric
Helford extensions — the local-studio difference.
Building stock
Across Helford (TR12) we work on traditional waterside cottages, Victorian villas, Edwardian houses, high-end modern carefully detailed riverside homes. Each stock type drives a different extension response — high-end modern carefully detailed riverside homes in particular needs careful detailing here.
Parish & policy
Helford sits in the parish of Manaccan, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover TR12 from our studio, with regular extension jobs also running in Manaccan, Gweek. Most Helford site visits get booked within the same week.
Can you handle both planning and build in Helford?
Yes — design, planning, building regs and full construction run under one roof. For clients with an existing Helford builder we can stop at a tender-ready Full Plans pack instead.
Request a free visitWho this is for
Helford runs the full mix — owner-occupier, holiday-let, commercial and the occasional smallholding — so we scope every extension enquiry from the use-class up.
FAQs
Helford 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 Helford specifically, we'd start by checking the Conservation Area boundary 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.
- 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.
Other services in Helford
Nearby places we cover
Every Helford extension we work on is treated as a TR12 job in its own right — local fabric, local policy, local builders.