Rooflights and skylights in Huntingdon

Huntingdon was granted its town charter by King John in 1205 and became the county town of Huntingdonshire, sitting on the north bank of the Great Ouse directly opposite Godmanchester. The two towns are joined by a well-preserved medieval bridge that once carried Ermine Street over the river and is still in use today. A Norman motte-and-bailey castle site survives beside the river, besieged during the 12th-century civil wars, and the 1975 Huntingdon bypass finally took through-traffic away from the centre, leaving the Old Bridge historic rather than the town's main crossing.

That long run of building, from a Norman river crossing to a county town's coaching-era High Street to a 1970s bypass, has left Huntingdon with roofs from several different periods sitting close together. A rooflight or skylight question here rarely has one answer, because the roof above a Georgian brick range and the roof above a later rear extension behave differently, and the room below each one calls for its own view.

What we plan for, in every one of them, is that view: how much open sky you actually see from the place you use the room, where a frame edge falls, and whether a bar sits in the middle of it. The sightline sketch that comes with every quote draws exactly that, from your pillow, your sofa or your worktop, before any brick or slate is touched.

Huntingdonshire District Council is the local planning authority, and it manages a conservation area covering the historic town centre, assessed in a character appraisal adopted in March 2007. The area takes in Market Square, where All Saints' Church stands next to the former grammar school building that now houses the Cromwell Museum, itself set in the medieval infirmary hall of St John's. The George Hotel on the High Street sits inside the same boundary.

A conservation area does not forbid a rooflight, but inside one the design of the unit is looked at as closely as its size, and a slope visible from a public street or from across the river gets more attention than one tucked away at the back. Whether an address sits inside the boundary, and whether a particular roof slope counts as visible in that sense, is checked for the address rather than assumed from a postcode.

Outside a conservation area, a rooflight can often go ahead under the national permitted development rules for roof alterations, provided it does not project more than 150 millimetres beyond the roof plane and meets the other conditions that apply. Inside one, and depending on what is confirmed for a particular building, that route can be narrower. We check the position with Huntingdonshire District Council before a product is fixed on the quote, so what we recommend is something that can actually be built.

Portholme lies between Huntingdon, Godmanchester and Brampton, around 104 hectares of Lammas meadow that still floods in winter and early spring and is recognised as a Site of Special Scientific Interest, the largest traditionally managed flood meadow of its kind left in the country. A Norman motte-and-bailey castle site survives on the riverbank close by, a reminder that this stretch of the Ouse has shaped the town's edge for close to a thousand years.

From a house that backs onto the meadow, the sky runs low and wide, with nothing but the water and the grazing land between a rear window and the horizon. That is about as open as a view gets anywhere we work, and a rooflight placed to catch it, with a slim frame and no bar across the middle, can hold a genuinely uninterrupted stretch of sky. Move back into the brick core around the High Street and Market Square, and the roofs sit closer together, gaps of sky between chimneys and ridgelines rather than an open horizon.

Both are real Huntingdon views, and both are worth planning for rather than guessing at. On the survey we look at what a room actually faces, whether that is the meadow, the river, or a neighbour's ridge a few metres away, and the sightline sketch shows what that means for the glass before anything is agreed.

A rear extension with a flat or very shallow roof, common behind older houses along and off the High Street, is a different job. Here a flat roof rooflight on a low upstand gives an unbroken pane with no bar at all, which suits a room seen from a table or a sink a few metres back rather than from directly underneath. The upstand height and the ceiling depth below decide how much frame you see from that distance, and we measure both on the survey so the sightline sketch is accurate rather than a guess.

For a bigger kitchen extension or a garden room, a roof lantern spreads glass and sightlines across more of the ceiling, and where a room is used after dark, an electric opening unit earns its keep. The table below is a general guide to which product tends to suit which room, though the survey always has the final say.

A windowless bathroom or inner hallway, the kind found in some of the older courtyard-style additions behind High Street buildings, is usually better served by a sun tunnel than by cutting a full rooflight into a short run of roof. It brings daylight down a reflective tube to a ceiling diffuser rather than framing a view as such, which suits a room nobody sits and looks up from for long.

Is my house inside the Huntingdon Conservation Area?

It depends on the address. The conservation area covers the historic town centre around Market Square and the High Street, assessed in a character appraisal adopted in 2007, and we check the position with Huntingdonshire District Council before recommending a product rather than assuming either way.

Does a listed building always need consent for a rooflight?

Not planning permission as such, but listed building consent, which covers the whole building rather than just its front. The George Hotel on the High Street is the town's best-known example of a listed building carrying several centuries of roof under one listing, and any change to a listed roof is looked at closely regardless of size.

Can the glazing bar on a conservation rooflight be kept out of my eyeline?

Often, yes. The sightline sketch shows exactly where a central bar would fall from your bed or chair, and depending on what is confirmed for your roof, the answer might be a different size, a different position on the slope, or in some cases a unit without a bar at all.

My house backs onto Portholme. Does that change what you would recommend?

It changes what there is to see rather than what is technically possible. A rear-facing roof over the meadow already has an open horizon, so we plan the frame and reveal to hold as much of that as the roof allows, rather than boxing it in with a deep lining or a heavier profile than the room needs.