Rooflight installation in Great Baddow

Ground that falls away towards the Chelmer and Sandon

Great Baddow occupies a shoulder of higher ground. The land drops north and west towards the Chelmer and east towards Sandon, and that slope matters more to a roof job than it sounds. The old core sits in shelter. The newer edges, especially the plots looking out over open fields, take weather with nothing standing in front of them.

Exposure changes the detailing rather than the product on the order. A sheltered rear slope in the lee of the higher ground lets standard flashing behave. An open rear elevation catching south westerlies across the valley wants a taller upstand and its clamping bars checked harder at handover. Levels are the second consequence. A plot that steps down its garden often carries a rear addition sitting a storey below the main roof, and a scaffold there needs a level base and proper ties before anybody goes up it.

Baddow Hall and the handmade clay above the old core

Roofs on the oldest fabric in the village, the range around Baddow Hall and the cottages near the church included, are largely small format clay laid double lap by hand. Every tile touching an opening is cut and dressed individually.

The flashing set that suits that covering works with soakers slid up between the courses. It is a different component from the one a deep ribbed concrete tile takes, and the two are not interchangeable. Fit a deep profile apron onto flat clay and it bridges, leaving a void that driven rain will find inside two winters.

Old clay carries a second issue. Fixing nails give up with age, and where a roof was torched underneath with a lime and hair mix, that mix crumbles to dust. Lifting tiles anywhere near an opening is the moment both show themselves. Sound tiles come off, get stacked and go back on. The failed ones are set aside and matched from salvage rather than filled in with something modern that will read wrong for the next fifty years. That is slow, skilled handling, and it is why an opening in a clay roof carries a different labour figure from the identical unit dropped into a modern estate roof.

Chalet bungalows and the depth of the internal lining

There is a decent stock of chalet bungalows here, first floor rooms sitting inside the roof with the ceiling following the rafter line for part of its width. The room is already in the roof, so daylight has a short distance to travel and the gain from glazing shows up immediately.

Thickness is what catches people out. Once insulation has gone in between the rafters and again beneath them, the shaft running from glass down to ceiling can measure 250mm or more. Line that shaft with four square sides and sunlight drops through it as a hard block on the floor and does nothing else useful. Cut the lining back at an angle instead, wider at the ceiling than at the glass, and the same opening washes light sideways across the room and looks close to twice its actual size from underneath.

Upstand height on an exposed Baddow rear

Level glazing lands on a kerb built up off the deck, with the waterproof covering carried up the outside of that kerb and stopped beneath the frame. The trade figure is 150mm, measured from the finished surface to the top of the kerb.

That number is two allowances stacked on each other. One for the depth of water that can sit on a deck before it drains away. One for how far rain will climb a vertical face with the wind behind it. On sheltered plots down in the old part of the village a manufacturer may warrant something lower where the falls are genuinely good. On the open ground facing Sandon and Galleywood, with nothing upwind to slow the weather, 150mm is a floor rather than a target, and shaving it so the glass sits flatter is a decision that returns in the third winter.

Drainage on the flat additions behind Baddow houses

A flat roof is laid to a fall. The design minimum is one in eighty, and that figure already builds in slack for a deck that deflects under load and for the tolerances of the people building it, so a finished surface ought to shed at that rate or better.

Water still lying two days after rain means the roof is ponding, and ponding held against the side of a kerb is what finds a tired lap or a weak termination. The village has plenty of candidates. Garages and link blocks were bolted onto interwar Baddow houses through the seventies, their joists have sagged in the four decades since, and the deck now holds a dish of standing water in the middle. Where a survey finds that, the order of work is falls first and glass afterwards. Setting a unit into a deck that does not drain only moves the difficulty to a place with a frame in it.

Loft rooms under the older Baddow roofs

Converting a loft works on the cut roofs of the two main roads and rarely on the trussed estates, for the structural reason above. Where one is going ahead, the glazing belongs on the drawing at the outset. Left to second fix it produces cables that were never run and openings landing in the wrong part of the slope.

One measurement carries most of the weight, and it is the height of the window head above the finished floor. A head at roughly two metres lets somebody standing beside it look out across the garden. A head at 1.6 metres gives the same person a bright ceiling and a view of cloud. On a shallow interwar slope that difference is decided by how far up the rafter the opening starts, which is a design question rather than a product one.

Notifying a Great Baddow rooflight to Chelmsford City Council

Cutting a new opening into a roof, or taking out an old unit and setting a current one in its place, has to be notified under the Building Regulations. Three parts apply in practice. Part L covers how much heat the glazing loses. Part K applies anywhere somebody could fall through or against it. Part B applies where the unit is the way out of a room in the roof. Great Baddow sits with Chelmsford City Council for both Building Control and planning.

Sunspire deals with the notification as part of the work, and the completion paperwork goes to the homeowner at the end of it. That matters more than it sounds. Unnotified alterations tend to surface at the point of sale, years later, when a buyer’s solicitor asks for a certificate nobody ever applied for and the transaction stalls while someone chases a regularisation. Planning consent is a separate question. Outside the conservation boundary a rooflight on a Baddow house normally falls within permitted development, provided the unit stands no more than 150mm above the existing roof plane.

What happens on the day the fitters arrive in Baddow

Timings hold reasonably well by job type. A roof window into a tiled Baddow slope is a single day. A level unit into an existing flat deck runs one day to two. A lantern that needs the ceiling opened up structurally takes two to four, and the spread depends mostly on whether a steel goes in.

The order of work rarely changes. Sheet and cover the room underneath. Take the covering back to expose the structure. Form the hole and trim the timber around it. Build or prepare the kerb on a flat deck, or set the flashing tray on a pitched slope. Land the unit and weather it in. Make the covering good right around the perimeter. Line and finish the reveal from inside. Whatever the forecast is doing, the roof is closed and watertight before the crew leaves each evening.