Skylights and rooflights in West Bridgford

West Bridgford is a town and the administrative centre of the borough of Rushcliffe, in Nottinghamshire. That makes Rushcliffe Borough Council the authority for planning questions about a rooflight, and it makes the town a slightly unusual case: the council that answers the question is based in the town itself. The town lies south of Nottingham city centre, east of Wilford, north of Ruddington and west of Radcliffe-on-Trent, and it is the south bank of the River Trent that gives it its northern edge.

The clause owners rely on is Class C, found in the rules on permitted development dated 2015. Its tests for a dwellinghouse are plain: the unit stands 150mm off the roof surface at most; its top stays below the roof's peak; and a pane in a side-facing roof slope is frosted and fixed, the one allowance is an opening part over 1.7m clear of the floor. Back slopes on terraces and villas meet them.

No conservation area bearing West Bridgford's name appears in the planning register. The nearest one it records is Edwalton, designated on 12 December 2005, a little under a kilometre from the centre, with six listed buildings standing inside, a Grade II* among five at Grade II. Wikipedia says the central area has a diversity of buildings, mostly Victorian, and that larger properties are being demolished for development because no protection exists for the common housing stock. Silence in the register means none recorded, which is different from none existing, and a street can still carry a local direction.

Building Regulations sit apart from planning. In the Regulations' eyes, cutting into a roof is a job of its own. Where it falls under notification, we lodge the Building Control paperwork ourselves, either with the borough's team or with one of the private firms registered as building control approvers; the certificate then travels with the house when it is sold.

Where an application is needed, a clear drawing with the product and the position of the opening marked on it answers a planning officer's first questions before they are asked. The council map tells us at the start whether any local direction applies.

West Bridgford was founded between 919 and 924, when defences and houses were built at the south end of Trent Bridge. It grew from a small village in the mid-19th century into a town of over 36,000 inhabitants by 2021. That growth is the key to its roofs. The central area is mostly Victorian, so the roads share a family resemblance, and the differences between them come down to money and plot size.

The better-off Nottingham merchants who bought property here built substantial houses. Smaller houses were permitted on side roads, and terraces were erected on roads such as Exchange Road for the servants of those merchants. So a few streets apart you can find a villa with a deep roof and a long loft, and a terrace with a narrow slope and a tight rear outrigger. Both are Victorian, and they do not take the same rooflight. A rooflight sized for the villa would swamp the terrace slope, and one sized for the terrace would look lost on the villa. We choose the size from the survey, with the room underneath in mind, and we show the position on the roof before anything is ordered.

The villa loft and the terrace loft

A villa loft is often tall enough in the middle to stand up in, with room for a full-size roof window in the back slope. A terrace loft has less to give. The slope is shorter, the headroom lower and the neighbours closer, so the window needs to be chosen to the gap between rafters, not to the catalogue. An old timber is not something to notch carelessly, and cutting one needs a proper trimmer. We survey from the loft, find where the rafters and any purlin run, and fit the opening around them.

Part L sets the energy bar. WER band B (short for Window Energy Rating) or 1.4 W/m²K qualifies a new roof window; rooflights need 2.2 W/m²K to pass. A Victorian loft that has never had a window may well have thin insulation as well, so the opening can be the moment to improve it. We fit a VELUX window whose size code, the letter for width and the digits for height, matches the gap we have.

A loft room over two Victorian storeys brings in Approved Document B. Its rule: height above ground decides it. A room higher than 4.5m cannot treat a window as its way out, so it relies on a protected stair. The roof window handles light and air, and the staircase handles escape.

Getting to West Bridgford is a 25.8 mile run north from Leicester, which takes about 35 minutes by van, so we plan a survey here around other work in the Nottingham area. Five classified roads, the A60 among them, lie inside a one kilometre radius, and the map has the full list. The map shows no railway station within two kilometres.

Water and green space surround the town. The Trent is the northern boundary, and the Grantham Canal and the Nottingham Canal both lie inside 1.5 km or so. The Green Line nature reserve is 1.1 km away, The Hook 1.2 km, Iremonger Pond 2 km, and Borough Hill rises 1.1 km from the centre, with Spinny Hill and Wilford Hill beyond it. The bridges link to cycling routes in the city centre, the railway station and the university areas.

Lady Bay, Abbey Park and Gamston are the recorded suburbs, each 1.5 km or closer to the centre. The roofs there include some that are as old as the Victorian core and some that came later. Every one of them gets the same treatment: we look in the loft first, then at the room, then at the street. Access gets a look too. A terrace with no side passage means ladders and materials go through the house, so we note that at the survey, agree which rooms to protect and say how long the work will take. Seeing the street last is deliberate. The view from the pavement decides how big a window can look before it starts to dominate the front, and it is the part a homeowner judges every day. On a back slope that overlooks only gardens the limit is looser, and we say so when we draw the position.

The extensions that fill the back of so many Victorian plots are where we see the most dark rooms. A kitchen-diner that runs the width of the house gets plenty of light at the garden doors and runs gloomy towards the hall. A roof lantern, the glazed crown that stands above a flat roof, floods the middle of it with light and gives the ceiling some shape. It sits on a kerb, so the roof around it has to be sound and built to the right fall.

Where an extension is smaller, or the budget more modest, a flat roof rooflight on its own kerb does much of the same work. A rooflight is a fixed unit, usually a sealed double or triple glazed pane in a frame. It cannot be opened in the way a roof window can, but the quality of the light is the same.