East Cornwall · PL13 · Cornwall Council East
Granny annexes in Looe — self-contained living, done well
A granny annexe in Looe is either an attached extension with a separate entrance, a garden building with independent services, or a garage conversion. Cornwall Council treats all three under the "ancillary residential" test — meaning they must remain connected to the main dwelling's planning use. Get the planning wording right and the design opens up. 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 PL13 site visit comes before a Looe sketch, every time — Looe is a working fishing town and seaside resort split by the Looe River into East and West Looe, with one of Cornwall's largest fishing fleets and a substantial Conservation Area covering both halves, with a building stock that leans toward Edwardian villas above the town and Victorian guesthouses.
Looe sits in East Cornwall — just off the A38; covering PL13 from Polperro, Duloe, Talland outward.
- Conservation Area
- Cornwall AONB
- Coastal exposure zone
- ✓Attached annexe: £75k–£110k built
- ✓Detached garden annexe: £95k–£140k
- ✓Ancillary use planning included
- ✓Self-contained services throughout
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Local proof — Most Looe extension clients we work with are second-time builders — they've seen the templated approach fail once already.
Get a free feasibility viewLocal context
Why Looe is its own job.
Cornwall Council's lens on Looe is consistent: conservation Area covers both East and West Looe historic cores; AONB across the wider parish. Flood Zone 3 designation affects substantial parts of the harbour and town. For extension specifically, parts of Looe 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 Looe drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure. That's why we treat every Looe project as a PL13-area job first — not a generic Cornwall job with a postcode bolted on. The Edwardian villas above the town that dominate Looe (and continue out toward Talland) set the tone for any extension scheme here. Historic fabric changes the sequence: survey first, then design around what the building can take. Consent routes for listed buildings sit separately from ordinary planning, so treat any general guidance here as a starting point and check with Cornwall Council. Exposure is the real design driver near the water: wind-driven rain, salt and driving damp push detailing towards better weathering, sheltered openings and robust fixings. Where an AONB or coastal policy applies, visual impact usually carries more weight than size.
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 Looe.
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.
Page purpose
Drawings only, or drawings through to handover in Looe?
Both routes are open on a PL13 project, and the honest answer depends on whether you already have a builder you trust. Plenty of Looe 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 PL13 scope, not as one opaque figure
Scope
Where our work starts and stops on a PL13 project
Not every project needs every stage. On a Looe job we scope to what the site and the consent route actually require.
Planning application drawings
Existing and proposed plans, elevations, site and block plans drawn to validation standard.
Full design and build
One contract from first sketch to handover, with the same team on paper and on site.
Heritage and design statements
Written justification where designation makes the design case as important as the drawing.
Building regulation drawings
Full Plans sets with sections, construction notes and coordinated structural information.
Measured survey
An accurate record of what is actually there, which is where most avoidable cost is removed.
Who this is for
Our footing in East Cornwall
- Designated-area work is routine here, so heritage and landscape statements are produced alongside the drawings rather than outsourced.
- Drawings, planning and building regulations are all produced in-house, so an extension enquiry does not get passed between firms.
- Design and build are offered from the same studio, which means the person answering your Looe questions has seen the detail built.
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
Related PL13 pages
We cover Looe and the wider PL13 district directly. Extensions enquiries here are common enough that we know the constraints before the first visit.
Our process
How a Looe 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.
Quick check
Want a straight answer on whether your Looe 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 Looe and the PL13 area.
Local fabric
Choosing an extension team that actually knows PL13.
Building stock
Across Looe (PL13) we work on medieval and Georgian harbour cottages, Victorian guesthouses, Edwardian villas above the town, modern coastal homes at Hannafore. Each stock type drives a different extension response — Edwardian villas above the town in particular needs careful detailing here.
Parish & policy
Looe is its own town in East Cornwall, with planning history that's specific to the PL13 catchment.
Coverage
We cover PL13 from our studio, with regular extension jobs also running in East Cornwall. Most Looe site visits get booked within the same week.
How quickly can you visit a Looe site?
Usually within the same week. Looe (PL13) is on our regular East Cornwall run, alongside East Cornwall. First visits are free and you'll get an honest feasibility view inside seven days.
Request a free visitFAQs
Looe Extensions — local questions answered.
- Do I need planning permission for a granny annexe in Looe?
- Yes — annexes always need planning consent to establish ancillary residential use. Attached annexes go through householder; detached garden annexes need full planning.
- How much does a granny annexe cost in Looe?
- £75k–£140k for a 30–55m² annexe with kitchenette, bedroom, bathroom and living area. Detached garden annexes cost 10–20% more than attached (utility runs and separate roof).
- Can we let out the annexe as a holiday let later?
- Only with a further change-of-use application. Ancillary consent explicitly ties the annexe to the main dwelling — subletting breaches that condition.
- 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 Looe specifically, we'd start by checking the Conservation Area boundary 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.
- We live in the house. Can an extension in Looe 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 Looe are often easier if you move out for a few weeks. We set that expectation at feasibility stage rather than halfway through.
Other services in Looe
Nearby places we cover
A Looe granny annexe is 50% design, 50% planning wording — get the ancillary-use case right and everything downstream is straightforward.
Design a granny annexe on your Looe plot
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