Rooflights and skylights in Forest Row, at the forest edge

Forest Row sits in East Sussex, in Wealden District, well outside the borough of Crawley and well inside the thirty miles we cover. The drive is 12.3 road miles, so a survey is an ordinary visit.

The village is a civil parish in its own right. Ashdown Forest surrounds it on three sides, and the upper River Medway runs through the parish. That gives the place an edge-of-the-woods feel that Crawley's New Town neighbourhoods do not have, and it changes the questions we ask at a survey. Crawley was designated in 1947 and planned in neighbourhoods. Forest Row grew along a road beside open heathland, and its houses were built for different reasons in different decades.

For a homeowner, the practical result is that no two roofs can be assumed alike. A cottage, a mid-century house and a recent infill home may stand a few minutes apart, and each needs its own reading. We look at how the roof is built, which way it faces, what covers it, and what the room underneath is used for. Then we choose the unit.

The local planning authority for Forest Row is Wealden District Council, with East Sussex County Council as the county. That matters because the rules you work under are Wealden's, not Crawley's. The South Downs National Park Authority covers 8 of Wealden's 41 conservation areas, and none of those eight is Forest Row.

Forest Row does appear on Wealden's list of conservation areas. The council reviewed the 1992 designation and designated the amended area on 22 March 2017. So a house inside the boundary is in a different position from one outside it, and the boundary is drawn on a map, not by the name of the village. A property with a Forest Row address can sit either side of it.

Living at the edge of Ashdown Forest brings its own roof conditions. Trees shed leaves, needles, seeds and twigs onto a roof, and what lands on a flat rooflight or sits in a valley affects how it performs. We do not claim to know which Forest Row streets have overhanging trees. What we can say is how to allow for them when a house has them.

Debris collects where water cannot shed it. A flat rooflight on a low-pitch roof needs an upstand high enough to keep standing water away from the glazing seal, and a slope that lets water run off rather than pool. On a pitched roof, the flashing needs channels that stay clear. We check the pitch at the survey, and where there is tree cover we talk about where the unit goes, because a rooflight placed under a heavy bough collects more than one placed clear of it.

Shade changes the brief for light, too. A room under trees may get less direct sun than the same room in open country, so the rooflight has to do more work. A larger opening brings in more, but it also loses more heat in winter, so size is a balance. A rooflight that is too small leaves the room dim, and one that is too large is hard to heat. Our guide on sizing a rooflight for the room gives a working method, and where to position a skylight in a room covers the placement.

Each quote arrives with a one-page note on the room: what was heard at the survey, the glazing build proposed and the finish of seals and upstand.

Because it is written down, it can be checked. On the day, you can look at the panes, count the layers, feel the gasket and see the upstand against the note. Nothing in it depends on a promise about how quiet the room will feel. It names parts, and parts can be inspected.

The detail round the frame matters as much as the glass. A gap in the insulation, a bare reveal or a flashing that chatters in wind will be heard long after the glass is forgotten. The note names those too. The quiet spec page explains the whole document, and the panel at the top of this page shows one written for a Forest Row bedroom.

These are the questions a homeowner here is likely to ask before booking a survey.