Decking Fitted in Millhouses

Millhouses runs along the Sheaf valley, and a good number of gardens here back directly onto Millhouses Park, the river, or the old railway line. That boundary is the most interesting thing about decking in this part of Sheffield, and it pulls in two directions at once.

The view is worth protecting. A garden backing onto parkland and mature trees has something almost no other Sheffield suburb offers, and a solid 1.8m fence across the back of it throws that away entirely. Where a plot backs onto the park we would usually suggest keeping the rear boundary lower or more open — and where a deck is raised, glass balustrade rather than timber — with the privacy screening on the side boundaries where the neighbours actually are.

Security pulls the other way, and it is a fair concern on a boundary with public open space. That is a judgement for you rather than us, and the honest answer is usually a compromise: a lower but robust rear boundary, planting rather than panels where it works, and the deck positioned so the seating faces the view without putting the back door on display.

The housing is largely interwar and post‑war semis and detached with long gardens, plus older stone properties along Abbeydale Road South. Plots tend to run away from the house down towards the valley floor, which is what makes a raised deck near the house so effective here.

This is the practical counterweight to the view, and it is worth being straightforward about.

Gardens on the lower ground near the Sheaf sit on valley floor land that holds moisture far longer than a hillside plot. Add mature trees along the park boundary and you get shade as well, and the bottom of the garden can stay damp for weeks after the top has dried.

Three consequences. First, composite over timber in most cases — it does not absorb water at ground level the way softwood does, and on permanently damp ground that difference compounds over fifteen years. Second, ventilation beneath the frame matters more here than almost anywhere. A deck built tight to wet ground with no airflow underneath will not last regardless of what the boards are made of, and proper clearance and airflow is standard on every deck we build. Third, position the deck up towards the house rather than down at the damp end, unless there is a compelling reason not to.

Where a garden is genuinely low‑lying near a watercourse, it is worth knowing your own flood risk position before investing in the lower part of the plot. We build decks and we are not flood risk assessors — the Environment Agency publishes flood risk information by address, and it is free to check.

Millhouses falls under Sheffield City Council. Most decks here need no application.

Decking is generally permitted development provided the platform sits no more than 300mm above existing ground level, and that it and other buildings cover no more than half the land around the original house. On a garden falling towards the valley, a deck level with the back door will often stand well above 300mm at its outer edge, which is precisely the raised deck design that works best here — so it is worth establishing the position early.

Where there is a drop of more than 600mm from the deck edge, guarding is required under Part K of the Building Regulations. On a raised deck overlooking the valley that is not a constraint so much as an opportunity, since glass balustrade meets the requirement without losing the view.

Trees are worth checking. Mature trees along a park or river boundary may be protected, and Tree Preservation Orders apply in parts of the area. We build decks, we are not planning officers or arboriculturists — Sheffield City Council can confirm tree protection and the planning position for a specific address.