Clay tiles, a medieval grid and the streets the railway built
Salisbury was planned. The cathedral moved down from Old Sarum in 1220, the city got its charter in 1227, and the streets of the Chequers were laid out as a grid. Most of the roofs in that core are older than the nineteenth century and most are clay tile. The neighbourhood plan's design guide calls the tiles the dominant character of the roofscape and wants them kept. Welsh slate shows up more in the later streets.
Those later streets are where most loft work happens. Fisherton got its stations in 1856 and 1857, and by 1860 Windsor Road and Windsor Street were lined with small terraces. The old county gaol site off St Paul's Road was covered with terraces by 1879. Over at Milford, the Elm Grove estate of large houses was laid out in 1864. Then came council building. Macklin Road in 1920, Wain-a-long Road and Waters Road in 1924, Bemerton Heath from 1946, Bishopdown from 1957.
The newest roofs are on the strategic sites at Fugglestone Red, Hampton Park and Longhedge near Old Sarum. Houses of that age are usually built with factory trusses. They convert, but the trusses have to be cut and replaced with steel, so expect the bigger quote.
What the planners will want to see
Much of the old city sits inside the Salisbury City conservation area, and Milford Hill has its own. Inside either, a dormer or a hip to gable needs planning permission, and that goes for the back slope as well as the front. Rooflights usually don't, unless an Article 4 direction says otherwise. There is a direction on the national register simply named "Salisbury", so check your street with Wiltshire Council before you assume.
The city's design guide is unusually specific about dormers. It wants them to follow historic proportions and line up with the windows below. It warns that bulky soffits make a dormer look heavier than it is. And for a big flat-roofed box it suggests something braver, a full new storey designed to look as if it was always there. We'd take that as a strong hint about what gets approved.
Rear dormer. The usual choice on a Fisherton terrace or an interwar council semi. Outside the conservation areas most go ahead as permitted development. Inside them, keep it slim and tile the cheeks to match.
Rooflights only. On a tiled roof in the old city this is often the least contentious option, because the roofline stays as it is. Pick conservation style rooflights that sit flush with the tiles.
L-shaped dormer. Worth looking at on a Victorian terrace with a back addition, such as those around Windsor Road or the old gaol site. The second dormer over the back addition gives room for a shower.
Hip to gable. Suits a hipped semi from the 1920s and 1930s, at Pembroke Park or the Netherhampton estate for example. On a corner the new gable is very visible, so draw it carefully.
Read our full guide: Hip-to-Gable Loft Conversions: What It Involves and Which Houses It Suits →
Mansard. Always a planning application. Salisbury's design guide prefers a well designed extra storey to a large flat dormer, which makes a properly detailed mansard easier to argue for than you might expect.
Extra bedroom. Most Salisbury homes have two or three bedrooms, so a third or fourth up top is the common brief. Fire doors and interlinked alarms are checked before sign off.
En-suite. In a narrow terrace the soil pipe route decides everything. Agree where the shower goes before the dormer is drawn.
Home office. A good use of a smaller loft with rooflights only. Run a data cable up while the floor is open.
Read our full guide: Loft Home-Office Conversion: What Works Well Up There and What to Specify →
Planning. In Salisbury the dividing line is the conservation area boundary. Outside it, most rear dormers are permitted development. Inside it, or on one of the city's more than 600 listed buildings, you need consent first.
Cost. We won't put a figure here. A trussed roof at Hampton Park and a tiled Victorian roof at Milford are different jobs, and three site visits will tell you more than any average.
Wiltshire Council, the city council and the river
Planning decisions are made by Wiltshire Council, the unitary authority that replaced Salisbury District Council. Salisbury City Council's planning committee comments on applications too. Search the council's register for your road first. What the neighbours were allowed to build tells you more than any guidance note.
Building control is Wiltshire Council's own team, based at Monkton Park in Chippenham. Inspections are booked by phone. Keep the completion certificate with your deeds.
Large parts of the city sit in the flood plain of the Avon and Nadder, which is why the Environment Agency built the Salisbury River Park scheme to cut flood risk to over 350 homes and businesses. A loft adds space without adding anything at ground level. Near the river, that makes it the more sensible way to grow a house.
Where these facts come from
- Wiltshire Council: conservation areas
- Wiltshire Council: contact building control
- Wiltshire Council: phosphorus and nitrogen mitigation
- Salisbury Design and Advertising Guide
- Victoria County History: Salisbury's growth
- Wiltshire Core Strategy 2015
- Salisbury Housing Needs Assessment (AECOM)
- Environment Agency: Salisbury River Park
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Questions people in Salisbury ask
I'm on Milford Hill. Can I put a dormer on the back without planning permission?
No. Milford Hill is a conservation area, and inside one any dormer needs planning permission, rear slope included. The same applies across the Salisbury City conservation area. Rooflights are usually still allowed without an application.
Do the River Avon phosphate rules affect a loft conversion?
Not for an ordinary loft. Wiltshire Council says nutrient neutrality on the Hampshire Avon does not generally apply to householder applications such as extensions. It does apply to any net addition of overnight accommodation, so a loft built as a separate flat or as B&B rooms is a different matter.
Will planners accept concrete tiles on a new dormer in the old city?
Don't count on it. The city's design guide describes clay tile as the dominant character of Salisbury's roofs and asks for it to be kept. Plan for clay tiles on the cheeks and roof, and lead or zinc in small amounts.
I bought on Fugglestone Red or Hampton Park. Can the loft be converted?
Usually, but houses this new tend to have trussed roofs, so a steel frame goes in. Check your title and the original planning permission as well, since some estate consents remove permitted development rights.