South Cornwall · PL22
St Winnow loft conversion — feasibility first, drawings second
A well-designed loft conversion adds a bedroom, an en-suite and useful storage to homes that were never built with the upper floor in mind — usually inside permitted development and almost always cheaper per square metre than extending sideways. Anchor any St Winnow loft conversion in the local fabric and the rest follows — St Winnow is a rural parish in the PL22 area, with farmsteads, lanes and scattered homes defining its built character, with a building stock that leans toward smallholdings and converted barns.
St Winnow sits in South Cornwall — covering PL22 from Lostwithiel, Lerryn, Lanlivery outward.
- Rural / open-countryside policy area
- ✓ 30+ years of Cornwall Council approvals
- ✓ rural policy area experience built into the fee
- ✓ Cornwall Council regulars across every sub-area
- ✓ Free first site visit, no obligation
Who this is for
St Winnow runs the full mix — owner-occupier, holiday-let, commercial and the occasional smallholding — so we scope every loft conversion enquiry from the use-class up.
Local watch-list
St Winnow-specific issues we screen on the first visit.
Watch #1
Tighter Local Plan tests on isolated rural dwellings
Local proof — Our South Cornwall workload means a St Winnow loft conversion project never has to wait for an out-of-county team to drive down.
Get a free feasibility viewFAQs
St Winnow Loft Conversions — local questions answered.
- Will I have enough headroom?
- We need a minimum 2.2 metres ridge-to-joist before alterations to make a usable conversion straightforward. Less than that and we'd consider raising the ridge, which is a planning conversation, not a permitted development one. In St Winnow specifically, we'd start by checking the latest parish-level planning history before committing to a direction.
- Do I need planning permission for a loft conversion?
- Often no — most loft conversions sit inside permitted development on a typical Cornish house. Conservation Areas, AONB and properties on principal elevations need full planning, and we'll confirm at first review.
- How much does a loft conversion cost?
- A simple Velux conversion starts around £30,000 in Cornwall; a rear dormer with en-suite typically runs £45,000 to £65,000; hip-to-gable and mansards more. Stair location and bathroom complexity drive most of the cost.
- How long does a loft conversion take?
- Allow six to ten weeks on site for a Velux conversion, eight to fourteen weeks for a dormer, twelve to eighteen weeks for hip-to-gable. Add four to eight weeks for design and regs beforehand.
- Will it add value?
- An extra bedroom and bathroom typically adds noticeably more value than the build cost in most Cornish markets — but the value matters less than the daily use you'll get from the space.
Local context
Why St Winnow is its own job.
Locally, open-countryside policy, access lanes, drainage and agricultural building history all need to be addressed before drawings go too far. For loft conversion 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. Which is why we scope St Winnow projects parish-up, not template-down — the PL22 context shapes the design from day one. Whether the project is on smallholdings in the centre or further out toward Lostwithiel, the loft conversion response is locally tuned.
Planning note
Most Cornish loft conversions are permitted development — but a Certificate of Lawfulness is worth the extra week and small fee for resale protection.
What we focus on
Loft Conversions considerations specific to St Winnow.
01
Permitted development volume allowances are 40 cubic metres on a terrace and 50 on a detached or semi — but rear dormers in Conservation Areas often need full planning.
02
Cornish slate roofs come in a huge range of pitches — anything below a 30° pitch struggles to give usable headroom without raising the ridge.
03
Stairs eat space — a loft conversion lives or dies by where the new staircase lands and what it costs you on the floor below.
04
Cut-roof Cornish properties are easier to convert than modern trussed roofs; the structural strategy varies completely.
Our process
How a St Winnow loft conversion project runs.
Step 1
Feasibility
Roof, headroom, stair landing and structural assessment.
Step 2
Design
Layout options that respect the staircase, headroom and bathroom positioning.
Step 3
Approvals
Planning or permitted development confirmation, plus building regs.
Step 4
Build
Sequenced to keep the family living downstairs throughout most of the work.
Step 5
Handover
Finish, snag, certify, hand over the keys.
Loft conversions typically run six to eighteen weeks on site depending on type, with four to eight weeks of design and approvals beforehand.
Local fabric
Why St Winnow homeowners pick a local studio for loft conversion.
Building stock
Across St Winnow (PL22) we work on farmhouses, converted barns, rural cottages, smallholdings, scattered modern homes. Each stock type drives a different loft conversion response — smallholdings in particular needs careful detailing here.
Parish & policy
St Winnow sits in the parish of St Winnow, which matters for how parish-level consultation lands on a loft conversion application.
Coverage
We cover PL22 from our studio, with regular loft conversion jobs also running in Lostwithiel, Lerryn, Lanlivery. Most St Winnow site visits get booked within the same week.
What does a first St Winnow consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a PL22 plot and follow up with a written feasibility note inside a week — no obligation either way.
Request a free visitSt Winnow is part of Lostwithiel
St Winnow sits inside the Lostwithiel catchment — we cover both as one loft conversion territory.
See Loft Conversions in Lostwithiel →Other services in St Winnow
Nearby places we cover
A loft conversion in St Winnow stands or falls on how well it reads the street — we treat that as the design brief, not an afterthought.