West Cornwall · TR20
Loft Conversions for Crowlas (TR20)
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. Crowlas sits in West Cornwall, and that geography ends up in the drawings — Crowlas is a commuter village in the TR20 area, with everyday family housing, edge-of-village plots and quick routes to its parent town, with a building stock that leans toward modern estates and garden infill plots.
Crowlas sits in West Cornwall — covering TR20 from Penzance, Chyandour, Sancreed outward.
- Cornish Mining World Heritage Site
- ✓ Fixed-fee planning packages, no surprise invoices
- ✓ Measured-survey accuracy from day one
- ✓ Same team on paper as on site
- ✓ Plain-English feasibility before any drawings
Our process
How a Crowlas 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 proof — Recent loft conversion enquiries from Crowlas have clustered around modern estates — we know the route through Cornwall Council on these.
Get a free feasibility viewWhat we focus on
Loft Conversions considerations specific to Crowlas.
01
Stairs eat space — a loft conversion lives or dies by where the new staircase lands and what it costs you on the floor below.
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
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.
04
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.
Local context
Why Crowlas is its own job.
In Crowlas the planning picture is specific: applications here usually turn on neighbour amenity, parking, overlooking and whether new work fits the rhythm of existing streets. For loft conversion specifically, the wider area forms part of the Cornish Mining World Heritage Site, which adds a heritage assessment layer to most material changes. That local reading is what makes a Crowlas (TR20) project different from a generic Cornwall scheme — and is the whole reason we work this way. On modern estates in particular — the kind you'll also find toward New Mill — the loft conversion brief always has to read the existing fabric first.
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.
Local watch-list
What usually catches loft conversion projects out in Crowlas.
Watch #1
World Heritage Site assessment on changes visible in the mining landscape
Crowlas is part of Penzance
Crowlas sits inside the Penzance catchment — we cover both as one loft conversion territory.
See Loft Conversions in Penzance →Local fabric
What sets a Crowlas loft conversion brief apart.
Building stock
Across Crowlas (TR20) we work on post-war semis, bungalows, modern estates, older cottages, garden infill plots. Each stock type drives a different loft conversion response — modern estates in particular needs careful detailing here.
Parish & policy
Crowlas sits in the parish of Crowlas, which matters for how parish-level consultation lands on a loft conversion application.
Coverage
We cover TR20 from our studio, with regular loft conversion jobs also running in Penzance, Chyandour, Sancreed. Most Crowlas site visits get booked within the same week.
Can you handle both planning and build in Crowlas?
Yes — design, planning, building regs and full construction run under one roof. For clients with an existing Crowlas builder we can stop at a tender-ready Full Plans pack instead.
Request a free visitWho this is for
Crowlas 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.
FAQs
Crowlas Loft Conversions — local questions answered.
- 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. In Crowlas specifically, we'd start by checking the latest parish-level planning history 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.
- 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.
- 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.
Other services in Crowlas
Nearby places we cover
Every Crowlas loft conversion we work on is treated as a TR20 job in its own right — local fabric, local policy, local builders.