South Cornwall · PL22
Lerryn 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. In Lerryn, that work is shaped by the place itself — Lerryn is a creekside settlement in the PL22 area, with waterside homes, wooded valleys and narrow-lane access shaping the brief, with a building stock that leans toward boat sheds and creekside cottages.
Lerryn sits in South Cornwall — covering PL22 from Lostwithiel, St Winnow, Lanlivery outward.
- Conservation Area
- ✓ Plain-English feasibility before any drawings
- ✓ 30+ years of Cornwall Council approvals
- ✓ Conservation Area experience built into the fee
- ✓ Cornwall Council regulars across every sub-area
Who this is for
Lerryn 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
Common Lerryn pitfalls we plan around.
Watch #1
Conservation Area material and fenestration controls in central Lerryn
Local proof — Our South Cornwall workload means a Lerryn loft conversion project never has to wait for an out-of-county team to drive down.
Get a free feasibility viewFAQs
Lerryn Loft Conversions — local questions answered.
- 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. In Lerryn specifically, we'd start by checking the Conservation Area boundary before committing to a direction.
- 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.
- 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.
Local context
Why Lerryn is its own job.
Locally, creekside ecology, flood risk, trees and views across the water often matter as much as the building form itself. For loft conversion specifically, parts of Lerryn sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape. Which is why we scope Lerryn projects parish-up, not template-down — the PL22 context shapes the design from day one. Whether the project is on boat sheds 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 Lerryn.
01
Cut-roof Cornish properties are easier to convert than modern trussed roofs; the structural strategy varies completely.
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
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
Cornish slate roofs come in a huge range of pitches — anything below a 30° pitch struggles to give usable headroom without raising the ridge.
Our process
How a Lerryn 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 Lerryn homeowners pick a local studio for loft conversion.
Building stock
Across Lerryn (PL22) we work on creekside cottages, detached houses, boat sheds, converted barns, waterside homes. Each stock type drives a different loft conversion response — boat sheds in particular needs careful detailing here.
Parish & policy
Lerryn sits in the parish of Lerryn, 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, St Winnow, Lanlivery. Most Lerryn site visits get booked within the same week.
What does a first Lerryn 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 visitLerryn is part of Lostwithiel
Lerryn sits inside the Lostwithiel catchment — we cover both as one loft conversion territory.
See Loft Conversions in Lostwithiel →Other services in Lerryn
Nearby places we cover
The loft conversion jobs we're proudest of in Lerryn are the ones where the planning route was clear before a single elevation was drawn.