Metal railings, fitted in London.

Height first, bar spacing second. A 1.2 metre run with closer bars uses meaningfully more steel than a 0.9 metre run at standard spacing, and both are priced per metre off the finished height rather than a flat rate.

After that it is the fixing. Railings core-drilled and resin-anchored into an existing brick plinth are the common London job. Where there is no wall, posts go into the ground and the run costs less to fix but more to set out, because the line and the levels have to be right before anything is fixed down.

Steel railings should be hot-dip galvanised before the colour goes on. Powder-coat alone over bare steel looks identical on day one and starts weeping rust at the welds within a few winters, usually where nobody looks.

That duplex system is what we quote as standard on steel. Aluminium railings skip the galvanising because they do not rust, and they are the better answer on a damp, shaded frontage.

Anything over one metre alongside a road or footpath normally needs planning permission, and most London front boundaries sit right on that line. We flag it before we price rather than after you have paid for something you cannot keep.

Conservation areas add their own rules on pattern and colour, and a number of London boroughs have an Article 4 direction that removes permitted development rights on front boundaries altogether — meaning even a low railing needs consent. If your street has a consistent railing style, matching it is usually the fastest route to approval and the better-looking result anyway.

Where the railing also guards a drop — a basement lightwell, steps down to a lower ground floor — bar spacing is a safety matter, not a style one. Building Regulations Part K works on a 100 mm sphere: nothing that gap should let a 100 mm ball through. We set the bars to that as standard on any run next to a level change, and we build to BS 1722 for the section sizes and fixings.

The top of the railing is what people actually notice, and it is the one choice we ask for on the estimate form. All five sit in the same rate band — the top you pick does not change the per-metre price.

Flat top is the plain, square finish. Quiet, modern, and the safest match for a new-build or a contemporary frontage.

Bow top curves the bars over at the head. It is the softest option, has no points at all, and is the usual pick where children play near the boundary.

Ball top finishes each bar with a small sphere. Traditional without being ornate, and the most common choice on a London terrace.

Spear top is the classic Victorian point. It reads as period-correct on an older house and adds a bit of deterrent along a low front wall.

Estate top uses wide-set horizontal bars rather than vertical ones. It suits long driveways, paddock edges and new-build frontages where you want the boundary read as open.

Plain vertical bar with a flat top rail is stocked, quick and covers most jobs at the rate above. Decorative heads, heritage patterns and anything raked to follow a sloping front path are fabricated to your measurements.

Those are survey-only. We will not put a per-metre number on a bespoke railing off a photograph — we measure it, then price it.