Rooflight and skylight installation in Danbury

Trees, which matter more than people expect

Danbury is heavily wooded and a great many trees are protected, either individually or by virtue of the conservation area, which brings automatic protection for trees above a certain size.

Three practical consequences.

Access positions. A scaffold or crane position may need to work around a canopy rather than through it, and lopping a protected tree to make room for a delivery is not a decision to take on site. Worth raising at survey.

Maintenance. Mature trees drop leaves, and leaves collect around a flat roof rooflight kerb and in perimeter drainage. Standing water against a seal is what kills a flat roof unit early, so on a wooded plot the clearing is a twice yearly job rather than an annual one.

Free solar control. A rooflight under a deciduous canopy is shaded in summer and gets full light in winter, which is exactly the right way round. Where that applies, the case for expensive solar control glass is weaker and the money is better spent elsewhere.

Exposure on high ground

A hilltop position takes considerably more wind than a sheltered valley village, and driving rain matters more for a roof window than total rainfall does, because wind driven water is pushed under a covering rather than running down it.

That puts the weathering job on the underlay collar and the flashing kit rather than on gravity. The kit must be correct for the covering and generously lapped rather than a universal one. Stainless fixings rather than plated cost very little more and do not stain an exposed roof.

On larger units and anything that opens, wind loading is worth checking against the site rather than assuming a catalogue figure, because an open sash is a sail.

Larger houses, better specification

Bigger houses do not need bigger rooflights; they need better considered ones.

The most common specification error we correct on properties like these is a single very large unit where two or three smaller ones would do a better job. One large rooflight gives one bright area and leaves the rest of a big room noticeably darker by contrast. Several spaced across the slope give even daylight, read as ambient light rather than as a feature, and are usually easier to fit because each can sit between structural members without trimming. They also fail independently, so a seal failure in twenty years means replacing one unit rather than a very large and very expensive pane.

Where a rear extension is large enough for a lantern to sit in proportion, it gives height and shape a flat unit cannot, and collects light from more than one direction so the room stays bright as the sun moves rather than having one good hour. It needs the structure below to carry it and a properly built insulated kerb.

Consent

Listed building consent is required for a rooflight on a listed building on any slope, visible or not, and there are listed properties in and around the village centre.

In the conservation area, permitted development for rooflights on an unlisted house survives unless an Article 4 direction removes it, which is a short enquiry to the council. Outside it, the ordinary rules apply: no more than 150mm projection beyond the plane of the roof and not above the highest part of it.

Where a tree is protected and any work would affect it, that is a separate consent from the council with its own notice period, and it is worth establishing early rather than late.

Access

Generally good, with generous plots, off street parking and space to stand a tower or erect scaffold on private land, which avoids the highway licences needed in the older towns. The constraints are the trees and, on some of the lanes, the route for a delivery vehicle carrying a large unit.

We cover Danbury from Colchester and plan it as full days rather than short visits. Access is a fixed cost shared across everything done on the same visit, so mention everything that needs doing at the enquiry stage.

Where cheap quotations save money

Usually in three places, none of them visible when the job is finished. A universal flashing kit rather than the correct profile for the covering. No insulation collar, or an uninsulated kerb. And making good that stops at the plasterboard rather than including the plastering and decoration.

On an exposed hilltop position the first of those matters more than it would elsewhere, because wind driven rain is pushed under a covering rather than running down it and the flashing is doing almost the whole weathering job.

Two guarantees

The manufacturer warrants the product, typically the sealed unit against seal failure for a stated period and the frame and mechanism for a shorter one. We guarantee the installation for ten years.

They are separate cover from separate parties, and most rooflight problems are installation problems rather than product failures, which is why the second matters more. A manufacturer’s warranty also generally excludes anything installed outside its own instructions, which means a badly fitted window can void the product warranty as well as leaking.

Where a unit does fail under a manufacturer’s warranty on a job we did, we handle that claim rather than leaving you to argue about a product we chose and fitted.

Timescales

A like for like replacement into a sound opening is a day. A new opening with making good is three to four days. A lantern on an existing extension, including the structural work, is usually a week.

What lengthens the programme is the order rather than the work. Made to measure units and lanterns run to several weeks, and where a structural engineer is involved their drawing has to come before the order rather than alongside it. The sensible sequence is survey, structural check, order, then book the fitting to the delivery date.