East Cornwall · PL11
Design, planning and build for Polbathic 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. A PL11 site visit comes before a Polbathic sketch, every time — Polbathic is a creekside settlement in the PL11 area, with waterside homes, wooded valleys and narrow-lane access shaping the brief, with a building stock that leans toward waterside homes and converted barns.
Polbathic sits in East Cornwall — covering PL11 from Torpoint, Millbrook, Antony outward.
- Rural / open-countryside policy area
- ✓ Cornwall Council regulars across every sub-area
- ✓ Fixed-fee planning packages, no surprise invoices
- ✓ Measured-survey accuracy from day one
- ✓ One studio — design, planning and build under one roof
Local proof — Recent loft conversion enquiries from Polbathic have clustered around waterside homes — we know the route through Cornwall Council on these.
Get a free feasibility viewLocal context
Why Polbathic is its own job.
Cornwall Council's lens on Polbathic is consistent: creekside ecology, flood risk, trees and views across the water often matter as much as the building form itself. 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. That's why we treat every Polbathic project as a PL11-area job first — not a generic Cornwall job with a postcode bolted on. The waterside homes that dominate Polbathic (and continue out toward Antony) 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 Polbathic.
01
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.
02
Stairs eat space — a loft conversion lives or dies by where the new staircase lands and what it costs you on the floor below.
03
Cornish slate roofs come in a huge range of pitches — anything below a 30° pitch struggles to give usable headroom without raising the ridge.
04
Cut-roof Cornish properties are easier to convert than modern trussed roofs; the structural strategy varies completely.
Our process
How a Polbathic 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 PL11.
Building stock
Across Polbathic (PL11) we work on creekside cottages, detached houses, boat sheds, converted barns, waterside homes. Each stock type drives a different loft conversion response — waterside homes in particular needs careful detailing here.
Parish & policy
Polbathic sits in the parish of Polbathic, which matters for how parish-level consultation lands on a loft conversion application.
Coverage
We cover PL11 from our studio, with regular loft conversion jobs also running in Torpoint, Millbrook, Antony. Most Polbathic site visits get booked within the same week.
How quickly can you visit a Polbathic site?
Usually within the same week. Polbathic (PL11) is on our regular East Cornwall run, alongside Torpoint, Millbrook, Antony. First visits are free and you'll get an honest feasibility view inside seven days.
Request a free visitFAQs
Polbathic 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 Polbathic 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.
- 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.
Polbathic is part of Torpoint
Polbathic sits inside the Torpoint catchment — we cover both as one loft conversion territory.
See Loft Conversions in Torpoint →Other services in Polbathic
Nearby places we cover
Most Polbathic loft conversion enquiries start with one honest conversation about what's actually allowed — and that conversation costs nothing.