West Cornwall · TR20
Long Rock 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 Long Rock, that work is shaped by the place itself — Long Rock is a coastal village on Mounts Bay between Penzance and Marazion, much expanded by twentieth-century development along the A30 and railway corridor, with a building stock that leans toward 1930s seafront bungalows and converted railway-era buildings.
Long Rock sits in West Cornwall — covering TR20 from Marazion, Penzance, Gulval outward.
- Coastal exposure zone
- ✓ Plain-English feasibility before any drawings
- ✓ 30+ years of Cornwall Council approvals
- ✓ coastal exposure experience built into the fee
- ✓ Cornwall Council regulars across every sub-area
Who this is for
Long Rock 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
What usually catches loft conversion projects out in Long Rock.
Watch #1
Coastal exposure driving fixing, render and joinery spec
Local proof — We typically have one or two loft conversion jobs live in the TR20 area at any time, so the local planning officers know our drawings on sight.
Get a free feasibility viewFAQs
Long Rock 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 Long Rock specifically, we'd start by checking the latest parish-level planning history before committing to a direction.
- 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.
- 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.
- 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.
Local context
Why Long Rock is its own job.
Locally, outside Conservation Area and AONB but the seafront is environmentally sensitive; flood zone constraints affect properties south of the railway line. Ludgvan parish policy applies. For loft conversion specifically, coastal salt-laden air around Long Rock drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure. Which is why we scope Long Rock projects parish-up, not template-down — the TR20 context shapes the design from day one. Whether the project is on 1930s seafront bungalows in the centre or further out toward Ludgvan, 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 Long Rock.
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 Long Rock 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 a West Cornwall studio is the right fit for Long Rock loft conversion.
Building stock
Across Long Rock (TR20) we work on 1930s seafront bungalows, post-war estates, modern Persimmon-style estates inland, converted railway-era buildings. Each stock type drives a different loft conversion response — 1930s seafront bungalows in particular needs careful detailing here.
Parish & policy
Long Rock sits in the parish of Ludgvan, 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 Marazion, Penzance, Gulval. Most Long Rock site visits get booked within the same week.
What does a first Long Rock consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a TR20 plot and follow up with a written feasibility note inside a week — no obligation either way.
Request a free visitLong Rock is part of Marazion
Long Rock sits inside the Marazion catchment — we cover both as one loft conversion territory.
See Loft Conversions in Marazion →Other services in Long Rock
Nearby places we cover
The loft conversion jobs we're proudest of in Long Rock are the ones where the planning route was clear before a single elevation was drawn.