Penwith · TR19
Design, planning and build for St Levan loft conversion
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. What works on a TR19 plot rarely works elsewhere — St Levan is a rural parish in the TR19 area, with farmsteads, lanes and scattered homes defining its built character, with a building stock that leans toward rural cottages and converted barns.
St Levan sits in Penwith — covering TR19 from Porthcurno, Truro, St Austell outward.
- Cornwall AONB
- Rural / open-countryside policy area
- ✓ AONB experience built into the fee
- ✓ Local to Penwith — not a national franchise
- ✓ Same team on paper as on site
- ✓ Fixed-fee planning packages, no surprise invoices
Local proof — We typically have one or two loft conversion jobs live in the TR19 area at any time, so the local planning officers know our drawings on sight.
Get a free feasibility viewLocal context
Why St Levan is its own job.
Cornwall Council's lens on St Levan is consistent: open-countryside policy, access lanes, drainage and agricultural building history all need to be addressed before drawings go too far. For loft conversion specifically, 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; 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 St Levan project as a TR19-area job first — not a generic Cornwall job with a postcode bolted on. The rural cottages that dominate St Levan (and continue out toward St Austell) set the tone for any loft conversion scheme here.
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 Levan.
01
Cornish slate roofs come in a huge range of pitches — anything below a 30° pitch struggles to give usable headroom without raising the ridge.
02
Building regs require minimum 2.0 metre headroom over the stairs and 30-minute fire protection on the existing stair enclosure — both shape the design.
03
Cut-roof Cornish properties are easier to convert than modern trussed roofs; the structural strategy varies completely.
04
Stairs eat space — a loft conversion lives or dies by where the new staircase lands and what it costs you on the floor below.
Our process
How a St Levan 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
Choosing a loft conversion team that actually knows TR19.
Building stock
Across St Levan (TR19) we work on farmhouses, converted barns, rural cottages, smallholdings, scattered modern homes. Each stock type drives a different loft conversion response — rural cottages in particular needs careful detailing here.
Parish & policy
St Levan sits in the parish of St Levan, which matters for how parish-level consultation lands on a loft conversion application.
Coverage
We cover TR19 from our studio, with regular loft conversion jobs also running in Porthcurno, Truro, St Austell. Most St Levan site visits get booked within the same week.
How quickly can you visit a St Levan site?
Usually within the same week. St Levan (TR19) is on our regular Penwith run, alongside Porthcurno, Truro, St Austell. First visits are free and you'll get an honest feasibility view inside seven days.
Request a free visitFAQs
St Levan 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 Levan specifically, we'd start by checking AONB landscape sensitivity 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.
- Can I live downstairs while it's built?
- Yes — most loft conversions are built with the family staying in the house. There'll be a couple of disruptive days when the staircase comes through, but the bulk of the work is upstairs.
- 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.
St Levan is part of Porthcurno
St Levan sits inside the Porthcurno catchment — we cover both as one loft conversion territory.
See Loft Conversions in Porthcurno →Other services in St Levan
Nearby places we cover
Designing a loft conversion in St Levan is as much about reading the parish as reading the brief; we do both, and the planning outcomes follow.