24.5 road miles west of Bournemouth
skylights & rooflights in crossways
The government's national planning data records no conservation area and no National Landscape over the centre of Crossways. The bungalows and semis of the early 1970s expansion and the newer estate streets each get a tape along the roof.
the newer roofs of Crossways
- Estate semis and terracesRecent builds, concrete tile, factory-made roof frames.
- Detached family housesGarages beside, lofts above, two full storeys.
- Older bungalowsSingle-storey homes with a loft void over a central hall.
- Rear extensionsFlat or shallow roofs behind a kitchen or dining room.
paperwork behind a Crossways roof
- planning authority
- Dorset Council
- conservation area
- check the Dorset Council map
- road miles
- 24.5
since the early 1970s
a village of newer estates
Crossways has grown fast. Much of the village stands on the eastern part of the former RAF Warmwell airfield, where sand and gravel were dug after the war, and it has taken estate after estate since the early 1970s. Most roofs here are recent, which changes what a survey looks for.
Trussed roofs on recent estates, and what they cost to open
The roof frame on a recent house is built to a different method than an old one.
The first big wave came in the early 1970s, when the local authority built flats, houses and bungalows and the village grew quickly. Many homes added since were put up on large sites by volume builders, in short runs of identical semis, terraces and detached houses. Their roofs were made from trussed rafters: triangular frames built in a factory, delivered to site and lifted into place at a fixed spacing. Every frame carries load as a whole, and each is designed with the others in mind.
A window placed between two trusses needs no cutting, and the narrower size codes exist for that gap. A wider window means cutting a truss. It calls for a structural calculation from an engineer first, then approval under Building Regulations. A cut made blind can overload the frames either side of it. On a recent estate house the cost therefore follows how much structure moves, and the glass is the smaller part.
A figure quoted without a measured roof means little. The survey produces the numbers.
A house with a loft that is full of storage may have been boarded by the owner, and that is useful to us. Boarded floor makes the reading of truss spacing and web positions easier, and a clear route for materials makes the job quicker.
Trussed roofs also have thin timbers and many diagonal webs, and the webs tend to land where you want the window. The webs are not structural decoration. They hold the frame in shape. We map them from the loft side before drawing a window position on the slope, and where one sits across the opening we move the window sideways to the next clear bay.
Insulation sits between and over the ceiling joists in most recent lofts, and it has to be lifted and replaced around a shaft or a lining. That adds to the work in the loft but does not change the position of the window.
What moves the cost of a Crossways rooflight job
- Whether a truss is cutA window between two trusses is the simplest case. A wider one needs a structural calculation and extra timber.
- Size and glass specificationLarger frames, opening models and added glazing layers each change the product cost.
- Shaft or ceiling finishA loft room needs only a lining. A hall through a loft needs a built shaft.
- Access to the roofA tower on a driveway is quick. A tight cul-de-sac or a terrace with no side path takes longer.
- Making good insidePlastering, painting and any clearing of storage under the opening.
Dorset Council, and where to look for conditions on a newer house
A recent build has a paper trail, and the trail can matter more than the village's location.
Crossways is in Dorset and falls to Dorset Council for planning. The council's maps show conservation areas and protected landscapes, and the government's national planning data records neither a conservation area nor a National Landscape over the centre of the village. The first search is therefore the planning register for the specific address.
That register is where a recent estate house tells its story. Volume builders often obtained permission for a whole development at once, and a condition on it can take away permitted development rights for roof alterations on some plots or all. Whether one applies to your house shows on the decision notice, never on the strength of what the neighbours did. The planning guide covers the wider rules, and asking us to check at the survey saves you the search.
The condition question is the commonest planning surprise on a newer street. Two houses a few doors apart can sit under different decision notices if they were built in different phases, so a rooflight that one owner fitted without an application proves nothing about the next.
Front slopes and rear slopes can also be treated differently, and some estate houses face their gardens to the south, which is the slope owners most want to open. The notice, if there is one, names the elevation it covers.
A new opening goes through the council's own building control team or a private approver, and the route is confirmed at the quote. Neighbours in nearby Bovington follow the same path.
Existing lofts also hold surprises. A previous owner may have boxed in a tank, run a cable across the rafters, or fitted a fan duct from the bathroom to the roof, and each of those sets a limit on where a window can sit. Finding them at the survey costs nothing; finding them on the day the tiles come off costs a delay.
Estate house, recent build
- Roof frames built in a factory to a fixed pattern
- Original permission may carry a condition
- Concrete tiles of one standard pattern
- Narrower codes sit between trusses
Older village bungalow
- Cut timber rafters, spacing to be read
- Fewer conditions, but more history to check
- Tile or slate that may have been recovered
- Wider windows are possible once a trimmer is fitted
Four house types and the window that tends to suit each
Each street asks for something different when owners want more light.
A family house on a newer estate often has a landing lit only by borrowed light from the stairs, and a loft that may become a bedroom or an office. A roof window over the stairwell lights the landing, and in a loft room two matching windows give even light across the floor. Escape from a loft above two full storeys has to be by a protected stair, since a roof window cannot serve a storey that high.
A semi with a rear extension often has a kitchen or dining area with a flat roof at the back. A flat rooflight there throws light deep into the room, away from the garden doors. Older bungalows toward the middle of the village have a dark hallway, the classic job for a sun tunnel or a shafted roof window.
A garage conversion is the fourth case. Garages on a newer estate sit beside the house under a roof that often continues the main slope, so a window above the converted room needs the same truss check as the house itself.
Each type carries its own first check. After that, the second is always the same: where the structure will take a new opening and where it will not.
Conversions are more common than owners expect. A bedroom added over a garage, a study made from a box room, or a garden room built behind a kitchen each leaves one wall or ceiling without a window, and a rooflight is often the only way to light it. A room that gets daylight from above is also lit more evenly than one lit from a single side wall.
Heat is the other thing to weigh in a kitchen extension. A glazed roof over a south-facing room can warm it more than owners expect on a bright day, and an opening rooflight or vent lets that warmth out. Fixed units suit a north-facing room, where the aim is steady light more than air movement. We ask which way the room faces and when it is used before suggesting either.
| House type | Common roof | First check |
|---|---|---|
| Estate semi | Concrete tile, trussed | Truss spacing |
| Detached estate house | Gabled, trussed | Loft height, stair |
| Older bungalow | Hipped, cut rafters | Void over the hall |
| Rear extension | Flat or shallow | Kerb height, fall |
| Garage conversion | Continues main slope | Truss next to the wall |
The readings written down for a new-build loft
The figures that go on the sheet, taken from one example roof.
Every survey ends with a sheet in writing, and on a recent estate house it is short and specific. It records the spacing of the trusses, the pitch of the slope, the covering, the height of the loft at the point the window will sit, and the position of any water tank, cables or pipework in the way.
The readings come from an example roof only. Another house on the same estate can differ, because phases were built by different crews to slightly different details, and a neighbour's reading never stands in for yours.
Moreton station, on the line between Weymouth and London Waterloo, serves both Moreton and Crossways. Some owners buy in Crossways with a loft conversion in mind, and for them the sheet is useful early, before an architect has drawn anything. Nearby Wool has a station of its own and a similar mix.
A survey for a conversion looks further than the window itself. We note the floor area under the sloping ceiling, the stair position and the head height, because those numbers show whether a loft room is workable at all.
Photographs help a great deal. A picture of the loft with the hatch open, one of the roof from the garden and one of the room that wants light let us bring the right tools and plan the visit around what we expect to find.
When the sheet is finished it stays with you. Whether the work goes ahead with us or not, the readings remain yours, and any other firm quoting for the same roof can use the same figures.
Loft hatches matter too. Many estate lofts are entered through a hatch of about the width of one rafter gap, and large panes of glass cannot go through it. For a roof window, the glass and frame are carried up outside and fitted from the roof. For a ceiling diffuser or a lining, smaller parts go through the hatch. We check the hatch size at the survey.
faq
Crossways owners, with a roof in mind
Can a roof window go into a newer house without cutting a truss?
One narrow enough to sit between two trusses often can. Wider frames mean a truss is cut, and that needs a structural calculation plus approval under Building Regulations.
Is there a condition on my estate house stopping a new rooflight?
It depends on the original permission for the development. The decision notice on Dorset Council's planning register shows it, and we read the notice for you at the survey.
Does Crossways sit inside a protected landscape?
We find no protected landscape recorded for the village, but conservation area and listing records are checked by address, never by village.
Which rooflight lights a landing above my stairs?
A roof window over the stairwell is the usual choice, placed so light falls down the stair. The survey first records the loft height and the truss spacing at that point.