Bexleyheath
Under the tiles and over the extension in Bexleyheath
How the suburb's 1930s semis, extensions, loft rooms and older terraces each take a rooflight, and what keeps them warm afterwards.
01Streets
The semis that built Bexleyheath, and the glass they are missing
Bexleyheath is a suburb of long, tidy roads of inter-war houses, and rooflight installation in Bexleyheath mostly means finding daylight for rooms those houses never gave it.
Walk away from the Broadway and the shape of the place is plain. Row after row of 1930s semi-detached and terraced houses, bay windows at the front, a pitched tiled roof, a garden behind. Here and there you meet older Victorian terraces close to the shops, and later post-war infill and small modern estates where a gap was found. It is outer London housing: solid, well loved and very often extended.
Those extensions are where the trouble starts. A kitchen pushed out into the garden, a garage turned into a utility room, a loft converted with one small window. Every one of them leaves a room with nothing overhead but plasterboard and a lot of walls. A skylight is the cheapest way to change that, as long as the glass is chosen for the roof it sits in.
The mix matters because each roof type hides a different problem. Tiles over a loft hide thin rafter insulation, a flat extension roof hides an old felt or membrane layer, and a Victorian slate slope hides a deep, dark plan. Reading the roof properly is half of the work, and we do it at the free survey before we put a number on anything.
This is how we match the glass to the house when we survey in Bexleyheath.
| Bexleyheath house | Likely dark spot | Glass we look at first |
|---|---|---|
| 1930s semi with a rear kitchen extension | Middle of the new room | Flat rooflight or lantern on an insulated kerb |
| Converted garage | Windowless utility or study | Fixed flat rooflight, small and well sealed |
| Victorian terrace near the centre | Back bedroom or stair landing | Slim roof window on the rear slope |
| Loft room in a 1930s roof | Gloomy room under the tiles | Roof window pair, centre-pivot or top-hung |
02Council
Planning in the London Borough of Bexley
Bexleyheath is in the London Borough of Bexley, so the borough is the authority to ask, and the first step on a Bexleyheath job is a simple check rather than an application.
The general rules for fitting a skylight without a planning application are laid out in our skylight planning permission guide, and we would rather you read them there than find them half repeated on a town page. What we can say about Bexleyheath is narrower. Most of the housing is ordinary family houses, which is the situation those rules were written for. Flats and maisonettes are treated differently, and Bexleyheath has its share of purpose-built blocks and converted houses.
Some properties need a closer look. The Red House, home of William Morris, is a listed building, and that is the kind of address where consent comes before anything else. Any listed home in the borough needs listed building consent for new glass in the roof. If your road has special controls that remove permitted development, the Bexley planning team is the body that can tell you, and we will not guess on its behalf.
03Extensions
Lighting the rear extension of a 1930s house
The back of a Bexleyheath semi is where most of the money has gone, and it is also where the cold lives, because a flat extension roof with a big hole in it is only as warm as its edge detail.
Flat extension roofs from the 1980s and 1990s often carry thin insulation by today's standards. Put a modern rooflight in without thinking about that and you get a bright room with a cold ring round the glass. So we start from the roof build-up, not the window. What is the deck made of, how deep is the insulation, and where can a raised kerb be fixed so the cold does not bridge into the room.
Then the choice of glass follows. A flat roof rooflight is the plain, tidy answer for a worktop run or a narrow side return. A roof lantern earns its extra height over a dining table where the ceiling feels low and you want daylight from several sides.
When the ceiling is already tight
A low-profile flat rooflight sits on a slim insulated kerb and adds light without eating headroom. It suits a galley kitchen or a utility room where a lantern would look top heavy.
When the room is wide and plain
A lantern lifts the middle of the ceiling and pulls daylight deep into a family kitchen. The glazing spec matters more here, because more glass means more surface for heat to find.
04Lofts
Loft rooms under the tiles
Plenty of Bexleyheath loft rooms are bright enough in June and hard to love in January, and the fix is in how the window meets the slope.
A 1930s hipped roof gives a decent amount of space once the loft is boarded and insulated, and a pair of roof windows can turn it into a proper bedroom or study. The slope is the problem. Insulation is squeezed between the rafters, and every cut for a window is a chance to leave a cold edge. We fit an insulation collar round the frame, then close the reveal with insulated lining, so the heat in the room stays put.
If you already have an older VELUX window that has misted or become stiff, a like-for-like replacement is the quickest route, and it lets us renew the collar and the lining while the frame is out.
A Bexleyheath loft room, specified for warmth
- Glazing
- Double glazed as a minimum, triple where the room faces north or sits on a busy road
- Spacer
- Warm-edge, so the rim of the glass does not chill
- Frame
- Insulation collar fitted before the flashing goes on
- Lining
- Insulated reveal boards meeting the sloped ceiling
- Blind
- Thermal blind for winter nights, so heat is held in as well as light out
05Older homes
Victorian terraces close to the Broadway
Closer to the centre the houses are older and narrower, and their back bedrooms and landings are the dimmest rooms in the street.
A Victorian terrace has a deep plan. The front rooms get the street light, the back room gets a thin strip from the garden, and the stairs and landing in the middle get nothing at all. A single roof window on the rear slope above the stairwell can brighten the whole house, and because that slope faces the garden it is usually the less contentious one.
The rafters in these roofs tend to be slimmer than modern timber, and the insulation may sit at ceiling level or be missing, so we look in the loft before choosing a frame depth. The window has to sit in line with whatever insulation is there. Anywhere else and it becomes the coldest part of the stairwell.
Bexleyheath's 1930s semis have been pushed out into the garden, and the new back rooms are the ones that need daylight.
06Heat
Keeping Bexleyheath rooms warm under new glass
Outer London is milder than the Essex coast, but a glass roof still loses heat faster than a solid one, so the numbers deserve a look.
The houses here were built long before anyone measured roof heat loss, and plenty have been topped up with insulation since. That mixed history is why we never specify from the window alone. A good frame in a poor roof still leaves a cold spot, so the glass and the roof build-up are planned together.
Glass is graded by U-value, in W/m²K, which says how much heat passes through each square metre. Lower means warmer. Our energy-efficient rooflights page explains how glass, spacer and frame add up. Here are standard figures worth knowing, none of them a claim about a single product.
- 2.2W/m²K, the limit for a new rooflight in an existing home under Part L
- 1.4W/m²K, close to a good double glazed unit
- 1.0W/m²K or lower, within reach of triple glazing
- 10years of workmanship guarantee on every fitting
07The job
Fitting day in Bexleyheath, start to finish
Bexleyheath is 21 road miles from our Basildon base, so we plan the day to arrive, set up and finish in one go.
The run from Basildon crosses the Thames at Dartford, and we allow for the traffic there. Terraced streets here often have resident parking, so we agree where the van and any access equipment will go before the day. If a roof needs a scaffold tower, that goes in the quote too. Rear gardens in the 1930s roads are generally long enough to bring materials through the side gate or over the extension, and we check the route at survey so nothing heavy goes through your hall.
Under the Building Regulations, putting in a new rooflight with its glass and frame is notifiable, and so is a new opening; where it applies, we send the notification ourselves. Our Building Regulations answer explains when. We also work in nearby Crayford, Sidcup and Dartford.
- Free survey, inside and up top, looking at the roof build-up and the insulation.
- Written quote naming the glass, the kerb or collar, the lining and any planning check.
- Fitting day with floors and furniture covered, and one team start to finish.
- Insulated lining closed to the ceiling, and the room left tidy.
- Building Control notified where needed, and the 10-year guarantee in writing.
Bexleyheath homeowners: skylight queries we get asked
Can I fit a rooflight in a Bexleyheath semi without a planning application?
Often that is the position for an ordinary house, but not for flats, listed buildings or roads with special controls. Read our planning guide, then confirm your address with the London Borough of Bexley.
Can my 1990s flat extension roof carry a new rooflight?
We look at the deck, the depth of insulation and where a raised kerb can be fixed. Extension roofs from the 1980s and 1990s often carry thin insulation by today's standards, so the roof sometimes needs rebuilding. If it does, that goes in the written quote.
Can you light a windowless converted garage?
Yes. A small fixed flat rooflight on an insulated kerb brings in daylight without adding a window to the wall. We check the roof deck and the insulation before quoting.
Do you replace old VELUX windows in lofts?
Yes. We can fit a like-for-like or a larger window and renew the collar and lining at the same time, which also helps the room hold its heat.
Who do I contact for a Bexleyheath survey?
Send a few details through our quote form or on WhatsApp. There is no charge for the survey or the written quote.
