West Cornwall · TR26 · Cornwall Council West
Dormer loft conversions in Carbis Bay, choosing the right dormer for the roof you have
A dormer is the usual way to turn a cramped Carbis Bay loft into a room you can stand up in, but the type matters more than most people expect. A box dormer buys the most usable floor area and looks the heaviest; a pitched roof dormer sits far more comfortably on a traditional slate roof; a series of smaller dormers can read well on a wide rear elevation. On West Cornwall roofs the proportion and the cheek detailing are what separate a dormer that looks original from one that looks bolted on. 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. Working in Carbis Bay means starting from the TR26 context — Carbis Bay is the residential coastal suburb of St Ives, climbing up the cliffs above one of the calmest beaches on the north coast and built largely between 1900 and 1970, with a building stock that leans toward modern coastal architect-designed homes and post-war bungalows.
Carbis Bay sits in West Cornwall — just off the A3074; with Truro the closest city; 1 miles from St Ives.
- Cornwall AONB
- Coastal exposure zone
- ✓Box, pitched and multiple dormer options tested against your roof
- ✓Permitted development volume checked before design
- ✓Cheek, flashing and weathering details drawn at large scale
- ✓Structural design coordinated with the loft floor and stair opening
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Page purpose
Drawings only, or drawings through to handover in Carbis Bay?
Both routes are open on a TR26 project, and the honest answer depends on whether you already have a builder you trust. Plenty of Carbis Bay clients take the drawings, tender them locally, then come back to us for the build if the numbers do not stack up.
- Route one: feasibility, planning and a tender-ready technical pack
- Route two: the same pack, then the build under one contract
- Either way the survey and feasibility work is identical, so the decision can wait
- Fees quoted per stage against the TR26 scope, not as one opaque figure
Scope
Scope options for Carbis Bay clients
These stages can be bought separately. Most TR26 projects use three of them.
Planning application drawings
Existing and proposed plans, elevations, site and block plans drawn to validation standard.
Measured survey
An accurate record of what is actually there, which is where most avoidable cost is removed.
Heritage and design statements
Written justification where designation makes the design case as important as the drawing.
Full design and build
One contract from first sketch to handover, with the same team on paper and on site.
Construction and technical drawings
1:10 and 1:20 details for the parts of the job builders normally have to guess at.
Local watch-list
Common Carbis Bay pitfalls we plan around.
Watch #1
AONB ridge-line scrutiny on hillside plots
Watch #2
St Ives Bay long-view protection
Watch #3
Sloped sites driving split-level slab design
Watch #4
Coastal exposure on north-facing facades
Who this is for
Straight facts about working with us here
- Designated-area work is routine here, so heritage and landscape statements are produced alongside the drawings rather than outsourced.
- Drawings, planning and building regulations are all produced in-house, so a loft conversion enquiry does not get passed between firms.
- Applications for Carbis Bay are handled through Cornwall Council, with Truro the nearest planning office we deal with regularly.
- Sites we know on the ground here include the area around the beach and Carbis Bay Hotel.
Planning rules change and every site is different. For the final position on your address, check with Cornwall Council as the local planning authority or the Planning Portal.
What we focus on
Loft Conversions considerations specific to Carbis Bay.
01
Cornish slate roofs come in a huge range of pitches — anything below a 30° pitch struggles to give usable headroom without raising the ridge.
02
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.
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
Cut-roof Cornish properties are easier to convert than modern trussed roofs; the structural strategy varies completely.
Quick check
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Send a few details — we'll come back within 1 working day with a plain-English view on planning risk, likely cost band and whether it's a project we'd take on.
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For projects in Carbis Bay and the TR26 area.
Local context
Why Carbis Bay is its own job.
Two things shape a Carbis Bay application: parish character and policy. On policy — aONB designation covers the whole village; coastal views and cumulative cliffside development are weighed in most applications. Carbis Bay sits inside St Ives parish's principal residence policy area. For loft conversion specifically, the surrounding landscape falls inside the Cornwall Area of Outstanding Natural Beauty, so massing, height and landscape impact carry extra weight in any planning decision; coastal salt-laden air around Carbis Bay drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure. Get that local reading right and the rest of the Carbis Bay programme tends to run on time. On modern coastal architect-designed homes in particular — the kind you'll also find toward Lelant — the loft conversion brief always has to read the existing fabric first. Salt air and prevailing wind change specification long before they change planning. We tend to draw weathering details in full, then check whether coastal or AONB policy narrows the design options for this address.
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.
Recent work nearby
Recent Carbis Bay hillside rebuild used a split-section ground slab to cut excavation in half.
See more recent West Cornwall work →Our process
How a Carbis Bay 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.
FAQs
Carbis Bay Loft Conversions — local questions answered.
- Do I need planning permission for a dormer in Carbis Bay?
- Rear dormers within the volume allowance are often permitted development, while dormers on a principal elevation facing a highway generally are not. Designations can remove permitted development rights altogether, so check your address with Cornwall Council or the Planning Portal before committing.
- What is the difference between a dormer and a rooflight conversion?
- Rooflights keep the roof line untouched and are the cheapest and least contentious option, but they add no head height. A dormer changes the roof form and creates usable floor area where the ceiling would otherwise slope away.
- How much head height do I need?
- You need a usable standing area and a stair that arrives with enough height above it. Where the ridge is low, a dormer can rescue a loft that would otherwise fail on head height, which is exactly when it is worth the extra cost.
- What finish suits a dormer in Carbis Bay?
- On an exposed coastal roof, slate hung or well detailed cladding with generous flashings tends to age better than render. We draw the cheeks and flashings rather than leaving them to be worked out on the scaffold.
- 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. In Carbis Bay specifically, we'd start by checking AONB landscape sensitivity before committing to a direction.
- We live in the house. Can a loft conversion in Carbis Bay be done while we stay put?
- Usually yes for single-storey and rear work, with a temporary kitchen or bathroom arrangement agreed before the start. Whole-house remodels and roof work in Carbis Bay are often easier if you move out for a few weeks. We set that expectation at feasibility stage rather than halfway through.
- 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.
Carbis Bay is the hub for these neighbourhoods
We run loft conversions across Carbis Bay and the surrounding TR26 neighbourhoods — same studio, same site team.
- St Ives
TR26
Keep reading
Where to go next from Carbis Bay
Carbis Bay works as a hub for us: the same loft conversion team covers St Ives and the surrounding TR26 villages, so a site visit here often takes in more than one address.
Other services in Carbis Bay
The right dormer in Carbis Bay is the one that gives you standing height where the room needs it while still looking like it belongs on the roof. That balance is a drawing exercise, not a catalogue choice.
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