Mid Cornwall · PL24
Loft Conversions Tregrehan: PL24 planning, Mid Cornwall fabric
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 PL24 plot rarely works elsewhere — Tregrehan is an estate-influenced village in the PL24 area, with designed landscape, older cottages and rural edges close together, with a building stock that leans toward small infill plots and converted outbuildings.
Tregrehan sits in Mid Cornwall — covering PL24 from St Austell, Bugle, St Dennis outward.
- Rural / open-countryside policy area
- ✓ 30+ years of Cornwall Council approvals
- ✓ Cornwall Council regulars across every sub-area
- ✓ Plain-English feasibility before any drawings
- ✓ One studio — design, planning and build under one roof
Local proof — Recent loft conversion enquiries from Tregrehan have clustered around small infill plots — we know the route through Cornwall Council on these.
Get a free feasibility viewLocal context
Why Tregrehan is its own job.
Landscape setting, curtilage history and estate character need a precise design rationale rather than a standard suburban approach. That sets the scene before any design work begins. 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. It's the kind of detail that decides whether a Tregrehan application gets approved at eight weeks or stalls in committee. The small infill plots that dominate Tregrehan (and continue out toward St Dennis) 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 Tregrehan.
01
Cut-roof Cornish properties are easier to convert than modern trussed roofs; the structural strategy varies completely.
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
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.
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 Tregrehan 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 Tregrehan homeowners pick a local studio for loft conversion.
Building stock
Across Tregrehan (PL24) we work on estate cottages, farm buildings, detached homes, converted outbuildings, small infill plots. Each stock type drives a different loft conversion response — small infill plots in particular needs careful detailing here.
Parish & policy
Tregrehan sits in the parish of Tregrehan, which matters for how parish-level consultation lands on a loft conversion application.
Coverage
We cover PL24 from our studio, with regular loft conversion jobs also running in St Austell, Bugle, St Dennis. Most Tregrehan site visits get booked within the same week.
How quickly can you visit a Tregrehan site?
Usually within the same week. Tregrehan (PL24) is on our regular Mid Cornwall run, alongside St Austell, Bugle, St Dennis. First visits are free and you'll get an honest feasibility view inside seven days.
Request a free visitFAQs
Tregrehan Loft Conversions — local questions answered.
- 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. In Tregrehan specifically, we'd start by checking the latest parish-level planning history before committing to a direction.
- 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.
- 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.
- 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.
Tregrehan is part of St Austell
Tregrehan sits inside the St Austell catchment — we cover both as one loft conversion territory.
See Loft Conversions in St Austell →Other services in Tregrehan
Nearby places we cover
Designing a loft conversion in Tregrehan is as much about reading the parish as reading the brief; we do both, and the planning outcomes follow.