West Cornwall · TR26 · Cornwall Council West
Loft conversion timeline in St Ives — week by week
From first site visit to occupation, a St Ives loft conversion runs around 18–28 weeks. The variability sits in two places: whether planning is needed at all (most TR26 lofts are PD) and how complex the structural design is for the existing roof. We map both at feasibility stage. 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. The way we approach loft conversion in St Ives starts with a measured walk-round — St Ives is a designated Area of Outstanding Natural Beauty town with a tightly packed historic harbour, the Tate gallery and some of the steepest streets in Cornwall, with a building stock that leans toward granite terraces and Edwardian guesthouses.
St Ives sits in West Cornwall — just off the A3074; with Truro the closest city; 1 miles from Carbis Bay, 3 miles from Hayle.
- Conservation Area
- Cornwall AONB
- Coastal exposure zone
- ✓ Feasibility + measured survey: 1–2 weeks
- ✓ PD / planning route confirmed: weeks 3–6
- ✓ Building regs + structural: weeks 6–10
- ✓ On-site build: 8–12 weeks
Local watch-list
St Ives-specific issues we screen on the first visit.
Watch #1
Principal Residence policy ruling out new dwellings sold as second homes
Watch #2
Granite-walled cottages where loft conversion headroom is borderline
Watch #3
Stepped access on Downalong streets limiting plant and crane reach
Watch #4
Slate roof pitches that complicate dormer geometry
Who this is for
St Ives 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 context
Why St Ives is its own job.
Two things shape a St Ives application: parish character and policy. On policy — st Ives operates a Neighbourhood Plan with a principal residence policy on most new dwellings — second homes and holiday lets face strong policy resistance. The Conservation Area covers Downalong, the harbour and most of the town centre, where granite, slate and lime-render detailing is non-negotiable. For loft conversion specifically, parts of St Ives sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape; 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 St Ives 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 St Ives programme tends to run on time. On granite terraces in particular — the kind you'll also find toward Carbis Bay — 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.
What we focus on
Loft Conversions considerations specific to St Ives.
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.
Recent work nearby
Recent Downalong fishermen's cottage refurbishment held its slate-hung gable and added a rooflight-only loft.
See more recent West Cornwall work →Our process
How a St Ives 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
St Ives Loft Conversions — local questions answered.
- Do I need planning permission for a loft conversion in St Ives?
- Usually no — most TR26 lofts qualify under permitted development. Conservation Area restrictions remove some PD rights here. Velux conversions are nearly always PD; full dormers sometimes need a Lawful Development Certificate.
- How long is the on-site build for a St Ives loft conversion?
- 8–12 weeks on site, depending on stair access and whether you're staying in the property. Steel install and weather-tight enclosure happen in weeks 2–4; first fix and finishes fill the rest.
- Can the loft conversion run while we're living in the house?
- Yes — most St Ives clients stay in. Dust protection at the existing landing is the main consideration. Bathroom commissioning is the only week you'll really notice.
- 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 St Ives specifically, we'd start by checking the Conservation Area boundary before committing to a direction.
- 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.
St Ives is the hub for these neighbourhoods
We run loft conversions across St Ives and the surrounding TR26 neighbourhoods — same studio, same site team.
- Carbis Bay
TR26
- Nancledra
TR20
Local proof — Our West Cornwall workload means a St Ives loft conversion project never has to wait for an out-of-county team to drive down.
Get a free feasibility viewOther services in St Ives
Nearby places we cover
Local neighbourhoods in St Ives
A loft conversion in St Ives doesn't need to take six months. With PD confirmation, parallel building regs and a tight on-site programme, most jobs occupy in under five months.