Raised decking in Cheshire for sloping and split-level gardens

A surprising number of Cheshire gardens go largely unused because there is nowhere flat to put a table. Houses sit above their plots, gardens climb towards the Peak District fringe at Macclesfield and Congleton, drop away towards the Mersey at Runcorn, or fall steadily from a raised terrace in Chester. Raised decking answers all of these by creating a level, generous platform exactly where you want it — usually right outside the back door.

It is also, in most cases, the most economical way to do it. The alternative is retaining walls, drainage behind them, and lorry-loads of imported fill compacted in layers. That is a substantial civil engineering exercise with a substantial price to match. A raised deck spans the level change on posts and pads, and it can usually be built in under a week.

Designing a raised deck around your threshold

The starting point is always the door. We set the finished deck surface just below the internal floor level — typically 20 to 40mm — so the step out is barely perceptible, while keeping the deck at least 150mm below the damp proof course with a ventilation gap at the wall junction. Where a flush threshold is wanted for bi-folds or sliding doors, we design a drainage channel at the door line and detail the build-up so the requirement is met without compromising the wall.

Engineering the structure

Raised decks carry real loads at height, so the structure has to be designed rather than assembled. We size posts to the height and load, brace them where the deck exceeds a metre, use through-bolted connections at critical joints rather than screws, and sit every post on a concrete pad dug to firm bearing with a base plate that keeps timber out of ground contact. On sites where rock is shallow — common around Frodsham, Helsby and parts of Runcorn — we drill and fix base plates directly into sound stone instead of excavating.

The frame above uses treated joists at 400mm centres, tightened to 300mm under hot tubs or heavy planters, with joist tape along every top edge. On multi-level schemes each platform is framed independently and tied together at the step transitions, so differential movement never opens a gap at the joint.

Steps that people do not trip on

Step geometry is the most under-appreciated part of a raised deck. Every riser in a flight must be identical — inconsistency is exactly what causes falls, particularly in the dark. We set out risers between 150 and 190mm with generous goings, prefer wide flights that read as part of the deck rather than as a staircase, and light the treads with recessed low-voltage fittings wired in during the build. Handrails are fitted where flights warrant them, at a comfortable graspable height.

Balustrade options

Balustrade is where a raised deck gets its character. Slatted timber or composite gives privacy and shelter, and works well where a deck is overlooked. Stainless wire infill keeps the outlook open and suits rural plots around Knutsford, Tarporley and the Cheshire hills. Frameless glass gives the clearest view of all and is popular on elevated sites with countryside or estuary views, though it needs cleaning to look its best. All of it is specified to meet guarding requirements where drops demand it.

Making use of the space underneath

A raised deck creates a genuinely useful void. We frame it as a dry, ventilated storage compartment with a lockable access panel, which typically swallows bikes, bins, garden furniture cushions and mowers — a real win on modern estates where garden space is tight. Where storage is not required, a slatted skirt keeps the underside tidy and animals out while letting air move freely, which the structure needs anyway.

Drainage on a sloping site

Sloping gardens shed water across the site in volume during heavy rain, and that water has to go somewhere other than against your house. During the foundation stage, while the ground is open, we cut channels beneath the deck footprint, lay membrane and aggregate, and where needed install a land drain running to a soakaway. Doing it then costs a fraction of retrofitting it later, and it protects both the deck and the building.

Costs and next steps

Raised decking generally costs 25–50% more per square metre than an equivalent ground-level deck, because of the posts, bracing, guarding and steps. As a rough guide, a raised composite deck with balustrade and a step run usually lands between £230 and £330 per m² installed. Our decking prices page sets out worked examples. Choose your surface from composite or timber, then book a free survey — we cover every town in Cheshire.