Skylight Installation in Elmswell
- Fixed quote before we start
- Roof never left open overnight
- 10-year workmanship guarantee
- Fixed quote before we start
- 10 years workmanship guarantee
- 25 years fitting rooflights
- Skylights only, not a general roofer
Elmswell has expanded a long way beyond the old village core, and most of what has been built here in the last thirty years sits under prefabricated trussed rafters. If your house was built after roughly the mid-1970s, that is almost certainly what is over your head. It looks like a loft full of timber. It behaves nothing like a traditional cut roof, and that difference is the single most important thing about fitting a rooflight in Elmswell.
It is 15.9 miles north-west of Ipswich in a straight line, about half an hour up the A14 to the Woolpit or Elmswell turn. Easy run, and a job type we do a great deal of across this belt of expanding commuter villages.
What a trussed rafter actually is
A traditional cut roof is built on site from individual rafters, purlins and a ridge, and it has redundancy. Take one rafter out, double up the two either side, fit trimmers, and the load finds a new path. That is why forming a rooflight opening in a 1930s roof is an afternoon’s work.
A trussed rafter is a single engineered component. The rafters, ceiling ties and internal webs are designed as one triangulated frame, joined with punched metal nail plates, and every member in it is carrying calculated load in tension or compression. Cut any part of it, including a web that looks like it is doing nothing, and you have not weakened the truss slightly. You have changed how the whole frame behaves, and the failure mode is spreading at the eaves or deflection at the ridge rather than an obvious sag you would notice straight away.
The rule is simple and it is not negotiable: no part of a trussed rafter is cut, notched or drilled without a structural engineer’s design. That is BS 5268 and BS EN 1995 territory, and it is also what your building warranty and your buildings insurance expect.
So how do you get a rooflight into a trussed roof?
Three routes, and which one applies depends on the size you want and where.
- Fit between trusses, cutting nothing. Trusses are usually at 600mm centres, which after the timber width leaves a clear gap of roughly 550mm. There are roof windows made to fit that gap. It is by far the cheapest and quickest answer and it is a genuine option, just a narrow one.
- Trim across one truss with an engineered solution. This is the common route for a normal-sized window. The truss is cut only after new structure is in place to carry what it was carrying, typically doubled trimming members or a steel spanning between adjacent trusses, designed and calculated for your specific roof. It is a proper engineering job with drawings and it is priced accordingly.
- Span more than one truss. For anything wide, you are into girder trusses or a steel beam, and the cost curve gets steep. Worth knowing before you set your heart on a picture window.
We work out which of the three applies at survey by measuring truss centres and looking at where the webs land. Two rooflights that each sit between trusses often cost a fraction of one that needs a truss cut, and let in a similar amount of light.
The warranty question
Newer Elmswell stock is often still inside a structural warranty period, commonly ten years from completion. Structural alterations carried out without proper design can compromise a claim later, and the sort of alteration most likely to cause an argument is exactly this one: someone cutting a truss because it looked like an ordinary rafter. Keep the engineer’s calculation with your house paperwork. It costs a few hundred pounds and it settles the question permanently.
Modern roof coverings and the flashing that suits them
Most of this stock is covered in deep-profile concrete interlocking tiles. Flashing kits are profile-specific, so the apron has to be the corrugated sort that dresses down into the tile roll, not the shallow plain-tile skirt. On the newest houses you will also find breathable membranes under the battens rather than traditional bitumen felt, which changes the underfelt collar detail around the opening. Both are ordered with the unit once we have measured the covering on site, which is part of why a VELUX, Keylite or Roto installation gets specified after the survey rather than before it.
Straight answer on cost: a rooflight fitted between two trusses in an Elmswell house is one of the cheaper jobs we do. A rooflight requiring a truss to be cut and re-supported carries the engineer’s fee and a day or more of extra structural work. Same window, very different price. The survey tells you which one you are buying before you commit.
What people fit here
Most enquiries are one of two things. A loft conversion or loft room in a family house, which is a pitched roof skylight installation and usually the point at which the truss conversation happens in earnest. Or a rear extension over a kitchen or dining space, where the roof is new construction designed by someone who knew a rooflight was going in, so the structure is straightforward and the job becomes a flat roof rooflight installation or a roof lantern depending on the ceiling.
Newer houses hold heat well, so on a south-facing slope it is worth looking at the g-value of the glass and not just the U-value. There is more on that on energy efficient skylight installation.
Not every Elmswell roof is trussed
The expansion is what defines the village now, but Elmswell has an older core around the church and the station, and the roofs there are a different animal. Period cottages and pre-war houses have hand-cut roofs of solid rafters and purlins with no metal plates anywhere, and a few of the oldest buildings carry the irregular timber and occasional listing that goes with genuine age. On that stock the truss rules do not apply. An opening is trimmed the traditional way, cutting a rafter and doubling the two either side, and the constraint becomes the covering and the old timber rather than an engineer’s calculation.
You can usually tell which you have from the loft hatch. A dense web of diagonal timbers joined with flat punched-metal plates is a modern trussed roof, and the gap between trusses sets your unit width. Loose, chunky rafters and purlins with no plates is a cut roof, and the job is trimmed around what is there. We confirm it on the first visit, because pricing a cut roof in the old core and a trussed roof on a new estate from the same assumptions gets both wrong.
What the loft survey settles
On the trussed stock the survey is mostly measurement and layout. We record the truss centres, usually around 600mm but worth checking rather than assuming, and note where the webs land so we can see which bays are clear. We also look for what shares the loft: a cold-water storage tank, its feed and overflow, soil vent pipes and the runs of any mechanical ventilation, because moving a rooflight a bay along to clear a tank is far cheaper than moving the tank. Where an attic-truss layout has left a room in the roof, the sloping ceiling is the underside of a working chord and the clear bays either side are where the glass wants to go.
Access on the newer estates is rarely the problem it is in the old villages. Most modern Elmswell houses have a driveway or an open frontage, so scaffold goes up without a neighbour agreement and materials come to the base of the roof easily. It is worth checking for any restrictive covenant or design code left over from the original planning permission, though, since on some newer developments those say more about roof alterations than planning law does. We flag it if your estate carries one.
Getting a price in Elmswell
Every job is surveyed in the loft as well as on the roof, then priced once in writing. Ten-year workmanship guarantee, installed to current Building Regulations, fitted by installers with 25 years in the trade.
We cover the same growing villages at Thurston and Woolpit, and into Bury St Edmunds. The full list is on areas we cover.
Request a fixed quote for Elmswell. If you can get into the loft, measure the gap between two adjacent trusses and send us the number. It tells us a lot.
My Elmswell house has a trussed roof. Can I still have a rooflight?
Yes. The question is which of three routes it takes. A narrow unit fitted in the clear gap between trusses, typically around 550mm, needs no structural work at all and is the cheapest option. A standard-width window usually means cutting one truss, which requires a structural engineer’s design and new supporting members installed before anything is cut. Anything wider than that needs a beam or girder truss. We measure the centres at survey and tell you which.
What happens if someone just cuts the truss anyway?
Nothing dramatic on the day, which is exactly why it keeps happening. A trussed rafter is a triangulated frame where every member carries calculated load, so removing one redistributes forces in ways the design never allowed for. The results show up over years as spread at the eaves, deflection, or cracking at ceiling level. It also gives your insurer and any structural warranty provider a straightforward reason to decline a claim.
Does new-build growth in Elmswell mean the roofs are all the same?
Broadly the structural principle is the same, prefabricated trusses at 600mm centres, but the detail varies by build era. Older estate housing here tends to have bitumen felt under the battens; newer houses have breathable membranes, which changes the underfelt collar detail around the opening. Tile profiles differ between developments too, and the flashing kit has to match the actual covering. We measure rather than assume.
Do I need planning permission on a modern Elmswell estate?
Usually not. Permitted development generally allows a rooflight projecting no more than 150mm above the roof plane and sitting below the ridge, and modern estate housing here is not in a conservation area or listed. Check whether your estate carries any restrictive covenants or a design code from the original planning permission, since those occasionally say more about roof alterations than planning law does.
How do I know if my Elmswell house is trussed or a cut roof?
Look through the loft hatch. A modern trussed roof is a dense arrangement of diagonal timbers joined at the junctions with flat metal nail plates, and it fills the loft so it is hard to move around. A traditional cut roof is loose, heavier timber, rafters and purlins with no plates, and usually a more open space. Most of Elmswell built since the mid-1970s is trussed; the older core around the church and station tends to be cut. The two need different methods, so it is the first thing we establish at survey.
There is a water tank in the way of where we want the rooflight. Is that a problem?
Rarely a serious one. A cold-water storage tank, its feed and its overflow all share the loft on a lot of these houses, and the usual answer is to set the rooflight a bay along so it clears the tank rather than relocating the plumbing. We note where the tank and the pipe runs sit at survey and work the opening around them. Moving a rooflight a few hundred millimetres is straightforward; moving a tank and re-routing its feed is a job in itself, so we avoid it where the layout allows.
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.