How Much Does It Cost to Replace Warehouse Rooflights?
Replacing warehouse rooflights is budgeted per sheet and per bay. As a planning figure, a typical in-plane GRP sheet of around 3 square metres runs £380 to £780 supplied and fitted, falling toward the lower end with volume, and a bay of rooflights is priced together to share the access cost. Access, disposal, out-of-hours working and profile availability move the figure more than the sheet itself does.
This answer sits under our commercial skylight installation service. The rates here are for building a budget. A survey turns your roof into one fixed figure priced by bay. Our commercial rooflight replacement cost page covers the wider structure.
Per sheet and per bay
| Scope | Budget figure | Notes |
|---|---|---|
| Single in-plane GRP sheet, around 3 m² | £380 to £780 per sheet | Falls with volume, isolated sheets top the range |
| In-plane GRP, single skin | £110 to £190 per m² | Standard profile, polyester film, normal hours |
| In-plane GRP, twin skin with liner | £165 to £270 per m² | Includes liner rooflight and cavity detailing |
| Typical bay of rooflights | Priced together | Shares access, lower unit rate than isolated sheets |
| Moulded-to-match, discontinued profile | Add 25 to 60% per sheet | Tooling and minimum order quantity |
| High performance film upgrade | Add 12 to 25% per m² | Extends service life, usually good value |
| Out-of-hours or night working | Add 30 to 55% per phase | Labour premium and task lighting |
| Coastal upgrade, 316L and marine coatings | Add 8 to 15% per phase | For port-side and coastal roofs |
| Mobile platform or crane access | Quoted separately | Often the largest single variable |
What the rate includes
A per-sheet or per-bay figure for normal-hours work on an accessible roof covers the rooflight itself, its laps, sealant and fixings, the liner rooflight on a twin-skin roof, safety netting beneath the work, removal of the old sheet, and disposal. Disposal is worth naming: old GRP is construction waste and is taken off site and disposed of properly, and that is in the rate rather than added afterwards.
What the rate does not include. Specialist access equipment, out-of-hours premiums, discontinued-profile tooling, the coastal upgrade package, structural repair to corroded purlins or fixing points found once the roof is open, and any AOV smoke ventilation units. A rate quoted without naming these grows on the invoice. Ours name them, and the survey confirms which apply to your roof.
The survey variables that move the figure
- Access. Frequently the largest single line, and the one that varies most. A low roof with a safe internal route is cheap. A high roof needing a mobile platform or crane carries an access cost that can rival the rooflight cost.
- Volume. The per-sheet rate falls sharply with the number of sheets in a visit, because access is shared. A single isolated sheet prices at the top of the range, a full bay near the bottom. This is the reasoning in our replace rather than patch answer.
- Profile. A standard, still-made profile is a straightforward order. A discontinued profile needs a moulded-to-match sheet, adding tooling and lead time. Common on older Ipswich stock.
- Build-up. Twin-skin roofs cost more than single skin, because the liner rooflight and the cavity detailing are added.
- Working hours. Night and shutdown working adds a labour and lighting premium, priced openly.
- Exposure. Coastal and port-side roofs carry the 316L and marine-coating upgrade.
What it means around Ipswich
Distribution and logistics warehouses around the port and the A14 corridor frequently run late, so night working is often the only clear window, which adds the out-of-hours premium to many local jobs. High modern distribution sheds carry a significant access cost because of their roof height. On the coastal belt near Felixstowe and Harwich, the marine upgrade applies. Inland, around Colchester, daytime work on accessible roofs runs closest to the base rates. The survey is what turns these variables into one firm figure.
How much to replace one warehouse rooflight sheet?
As a budget figure, a typical in-plane GRP sheet of around 3 square metres runs £380 to £780 supplied and fitted, on an accessible roof in normal hours. An isolated single sheet sits at the top, because the whole access cost falls on one sheet. Replacing a bay of sheets in one visit brings the per-sheet rate down sharply, because the access is shared.
Is disposal of the old rooflights included?
Yes. Removing and disposing of the old GRP sheets is in the per-sheet and per-bay rate for standard work, rather than added afterwards. Old GRP is construction waste and is taken off site and disposed of properly. What sits outside the base rate is specialist access, out-of-hours premiums, discontinued-profile tooling and the coastal upgrade, which the survey confirms.
Get a firm figure for your warehouse
Use the rates here to build a budget, then let a survey turn it into a number priced by bay that you can commit to. We survey the roof, take the profile, confirm access and build-up, and fix the figure against the scope.
Request a survey. Read across to cost per square metre, how long a programme takes, and the full commercial rooflight replacement cost guide.
Thinking about this job? We survey across Ipswich, Suffolk and north Essex and give you a fixed price before any work starts, with a 10-year workmanship guarantee.