Rooflights and skylights in Gamlingay

Few of these roofs were set out to a modern rafter centre, so the first question at survey is whether an opening can sit inside the existing gap without touching a single timber. When the room needs more width than that, a builder trims the rafter either side of the new opening and hangs its cut end from a header piece, spreading the load sideways rather than carrying it straight down. It is ordinary work on this kind of roof, but it is decided by eye at the house, never assumed from a brochure size. The covering shapes the choice of unit as much as the timber does: red brick terraces and cottages in the village were mostly finished in plain clay tile, and a low, flush frame sits down into that pattern far more convincingly than a boxy unit standing above it, quite apart from keeping the water running cleanly off the upstand and away from the brickwork below.

For that reason a conservation-style rooflight, glazed with a single central bar and set flush with the tile, is usually our starting recommendation for the older part of Gamlingay, whether the house sits inside a protected area or not; it simply looks right on a red brick roof of this age. Whether protection applies to a given address is a separate question, and we check it rather than guess, following the reasoning set out in our guide to planning permission for rooflights.

A slope that opens onto farmland or a garden with a clear run of sky behaves the way a compass reading suggests: south for strong direct sun through the middle of the day, north for steady, even light with little heat behind it. A slope that instead looks towards mature trees, whether that is a garden boundary or woodland further off, can lose direct sun for part of the day even when the compass says it should have it, and that shade shifts through the year as deciduous trees come into leaf and drop it again. We do not read a Gamlingay roof from a compass alone; we look at what actually stands in front of each slope at the time of year the room matters most.

Where a roof sits close under trees, there is a second, practical point worth planning for: falling leaves and debris settle on a flat rooflight far more than they do on a pitched roof window, and a unit fitted with a shallow fall or positioned directly under an overhanging branch will collect more of it than one moved a metre or two clear of the canopy. It is a small point, but it is exactly the kind of thing a light plan written for the actual garden, rather than a generic one, catches before the glass goes in.

Raised on a timber kerb, insulated and standing a minimum of 150mm proud of the finished covering, a flat roof rooflight pulls daylight into a deep kitchen far more evenly than any wall window could manage, simply because it looks up at open sky rather than sideways at a fence or a neighbour's wall. Where the extension runs the full width of the house, a roof lantern does the same job while also raising the ceiling line visually, so a wide kitchen diner reads as taller as well as brighter. Getting the position right matters more than choosing a size: glass placed in the middle of a long room often ends up lighting the floor people walk across rather than the counter they work at, and shifting it a short distance towards the darkest corner of the plan is usually the change that counts.

Where the garden backs onto trees or a wooded boundary, we also look at how much of the extension roof actually sees clear sky through the day before settling on where the glass goes, rather than assuming the whole roof behaves the same way from one end to the other.

A compass reading comes next, but on a Gamlingay roof it is only the opening question rather than the answer, so we walk out into the garden to see what genuinely stands to the south, east and west: open field, a neighbour's gable end, or the edge of the woodland that borders parts of the village. Up in the loft, we identify what we are dealing with, cut rafters on the cottages, engineered trusses on most of the newer houses, and take a real measurement of the pitch instead of working from an assumed figure. That visit becomes a written light plan covering four things:

• Where the sun actually reaches the room through the seasons, once any shading from trees or neighbouring buildings is accounted for
• What the roof structure allows, and whether an engineer needs to be brought in
• Whatever the planning position turns out to be for that specific address
• Whether Building Control needs notifying, a step we take care of on your behalf

A 10-year workmanship guarantee sits behind every job we finish. To get a survey booked in, use the light survey form, or send us a message on WhatsApp.