Penwith · TR19 · Cornwall Council West
Extensions that reads Lamorna 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 Lamorna version of this work has its own character — Lamorna is a small wooded valley village leading down to a sheltered cove, AONB-designated, with strong artistic associations through the Newlyn School and Stanhope Forbes, with a building stock that leans toward Edwardian artists' houses and modern carefully detailed AONB replacements.
Lamorna sits in Penwith — just off the A30; covering TR19 from Mousehole, Paul, St Buryan outward.
- Conservation Area
- Cornwall AONB
- Coastal exposure zone
- Rural / open-countryside policy area
- ✓Local to Penwith — not a national franchise
- ✓Same team on paper as on site
- ✓Fixed-fee planning packages, no surprise invoices
- ✓Measured-survey accuracy from day one
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Local watch-list
Local snags worth knowing before drawing a Lamorna extension.
Watch #1
Conservation Area controls on materials, window proportions and roof form through central Lamorna
Watch #2
AONB landscape-impact testing on anything read in long views across Penwith
Watch #3
Exposure detailing on granite valley cottages — fixings, render systems and joinery specified for salt-laden air
Watch #4
Local Plan tests on isolated dwellings, plus lane access for plant and deliveries around Lamorna
Who this is for
In Lamorna the extension brief is almost always a private homeowner improving a forever home — so we lead with feasibility and long-term value, not show-home rhetoric.
Scope
The parts of the job we can take on in Lamorna
Not every project needs every stage. On a Lamorna job we scope to what the site and the consent route actually require.
Full design and build
One contract from first sketch to handover, with the same team on paper and on site.
Construction and technical drawings
1:10 and 1:20 details for the parts of the job builders normally have to guess at.
Building regulation drawings
Full Plans sets with sections, construction notes and coordinated structural information.
Planning application drawings
Existing and proposed plans, elevations, site and block plans drawn to validation standard.
Measured survey
An accurate record of what is actually there, which is where most avoidable cost is removed.
Who this is for
What we can genuinely back up in Lamorna
- Design and build are offered from the same studio, which means the person answering your Lamorna questions has seen the detail built.
- Drawings, planning and building regulations are all produced in-house, so a extension enquiry does not get passed between firms.
- Designated-area work is routine here, so heritage and landscape statements are produced alongside the drawings rather than outsourced.
Planning rules change and every site is different. For the final position on your address, check with Cornwall Council as the local planning authority or the Planning Portal.
Keep reading
Other work we do around Lamorna
Lamorna is covered from our Mousehole run. Being a smaller place, the local detail matters more than the headline policy: lane access, neighbour proximity and what the immediate street already looks like.
Page purpose
Drawings only, or drawings through to handover in Lamorna?
Both routes are open on a TR19 project, and the honest answer depends on whether you already have a builder you trust. Plenty of Lamorna clients take the drawings, tender them locally, then come back to us for the build if the numbers do not stack up.
- Route one: feasibility, planning and a tender-ready technical pack
- Route two: the same pack, then the build under one contract
- Either way the survey and feasibility work is identical, so the decision can wait
- Fees quoted per stage against the TR19 scope, not as one opaque figure
Local context
Why Lamorna is its own job.
Around Lamorna (TR19), conservation Area covers the valley and cove; AONB and Heritage Coast across the parish. Tight access through the wooded valley shapes construction logistics on every site. For extension specifically, parts of Lamorna 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 Lamorna 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. Reading Lamorna properly up front saves more time than any drawing tool ever will. Most of our extension work in Lamorna lands on Edwardian artists' houses, with detailing that has to nod to the wider Porthcurno 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 Lamorna.
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
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
04
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
Quick check
Want a straight answer on whether your Lamorna project is worth pursuing?
Send a few details — we'll come back within 1 working day with a plain-English view on planning risk, likely cost band and whether it's a project we'd take on.
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Get a free feasibility view
For projects in Lamorna and the TR19 area.
Our process
How a Lamorna 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
Lamorna Extensions — local questions answered.
- 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. In Lamorna specifically, we'd start by checking the Conservation Area boundary before committing to a direction.
- We live in the house. Can a extension in Lamorna be done while we stay put?
- Usually yes for single-storey and rear work, with a temporary kitchen or bathroom arrangement agreed before the start. Whole-house remodels and roof work in Lamorna are often easier if you move out for a few weeks. We set that expectation at feasibility stage rather than halfway through.
- 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.
- 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.
- 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.
Lamorna is part of Mousehole
Lamorna sits inside the Mousehole catchment — we cover both as one extension territory.
See Extensions in Mousehole →Local proof — Most Lamorna homeowners come to us after a extension quote elsewhere felt vague on planning — we lead with feasibility instead.
Get a free feasibility viewOther services in Lamorna
Nearby places we cover
Every Lamorna extension we work on is treated as a TR19 job in its own right — local fabric, local policy, local builders. Applications are dealt with through Cornwall Council, with Truro the office we deal with most for TR19.
Take an honest look at your Lamorna options Drawings now, build later, is a perfectly normal route.
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