East Cornwall · PL13
Design, planning and build for Lanreath 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. What works on a PL13 plot rarely works elsewhere — Lanreath is a rural parish in the PL13 area, with farmsteads, lanes and scattered homes defining its built character, with a building stock that leans toward smallholdings and rural cottages.
Lanreath sits in East Cornwall — covering PL13 from Looe, Duloe, Herodsfoot outward.
- Rural / open-countryside policy area
- ✓ 30+ years of Cornwall Council approvals
- ✓ Fixed-fee planning packages, no surprise invoices
- ✓ Measured-survey accuracy from day one
- ✓ One studio — design, planning and build under one roof
Local proof — We typically have one or two extension jobs live in the PL13 area at any time, so the local planning officers know our drawings on sight.
Get a free feasibility viewLocal context
Why Lanreath is its own job.
Cornwall Council's lens on Lanreath is consistent: open-countryside policy, access lanes, drainage and agricultural building history all need to be addressed before drawings go too far. For extension specifically, 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 Lanreath project as a PL13-area job first — not a generic Cornwall job with a postcode bolted on. The smallholdings that dominate Lanreath (and continue out toward Herodsfoot) 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 Lanreath.
01
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
02
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.
03
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 Lanreath 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
Choosing a extension team that actually knows PL13.
Building stock
Across Lanreath (PL13) we work on farmhouses, converted barns, rural cottages, smallholdings, scattered modern homes. Each stock type drives a different extension response — smallholdings in particular needs careful detailing here.
Parish & policy
Lanreath sits in the parish of Lanreath, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover PL13 from our studio, with regular extension jobs also running in Looe, Duloe, Herodsfoot. Most Lanreath site visits get booked within the same week.
How quickly can you visit a Lanreath site?
Usually within the same week. Lanreath (PL13) is on our regular East Cornwall run, alongside Looe, Duloe, Herodsfoot. First visits are free and you'll get an honest feasibility view inside seven days.
Request a free visitFAQs
Lanreath 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 Lanreath specifically, we'd start by checking the latest parish-level planning history 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.
- 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.
Lanreath is part of Looe
Lanreath sits inside the Looe catchment — we cover both as one extension territory.
See Extensions in Looe →Other services in Lanreath
Nearby places we cover
Designing a extension in Lanreath is as much about reading the parish as reading the brief; we do both, and the planning outcomes follow.