The balustrade is the part of a deck you touch every day and the part that fails first. In Bolton, where we get well over 1,000mm of rain a year and plenty of wind coming off the West Pennine Moors, the choice between composite and timber is less about looks and more about how much maintenance you are honestly prepared to do.
A timber balustrade is usually pressure treated softwood posts, handrail and baserail with turned or square spindles, or a hardwood like balau if you want something denser. It is cut and fitted on site, so it can follow an awkward line, a slight fall in the ground or a curved edge without much fuss.
A composite balustrade is a system. The posts are typically aluminium with a composite or PVC sleeve, and the infill is composite spindles, a solid panel or glass. It arrives in fixed lengths and is assembled to a set spacing, which means the design has to be planned around those modules rather than trimmed to suit on the day.
Supplied and fitted, a decent treated softwood balustrade in this area generally lands somewhere around £70 to £120 per linear metre. Composite systems tend to run £150 to £260 per linear metre, and frameless or channel glass sits higher again. Those are ranges, not quotes: post spacing, whether you need newel posts bolting through joists, and how many corners and steps you have will move the figure considerably.
The gap narrows over time. Timber wants cleaning and re-oiling or re-staining every 12 to 24 months here, and spindles or baserails that sit in standing water often need replacing at eight to fifteen years. Composite rarely needs more than a wash, and most systems carry a manufacturer warranty in the 20 to 25 year range. If you are staying put, composite usually wins on lifetime cost. If you are selling in three years, timber is the sensible spend.
Damp is the deciding factor. Timber handles rain fine when it can dry out, so a south facing balustrade on an open deck in Horwich will last far longer than the same timber on a shaded north facing terrace in Astley Bridge under a sycamore. If your deck sits in shade for most of the day, timber will green up with algae within a season and you will be scrubbing it twice a year.
Composite does not rot, but it is not maintenance free either. Cheaper uncapped boards and spindles can go blotchy where moss sits, and dark colours get noticeably hot in direct summer sun. Look for a capped or co-extruded product if you want colour to hold.
Building Regulations Part K matters more than material choice. Where a deck is more than 600mm above the ground, guarding is required. For a domestic deck or balcony that guarding should be at least 1,100mm high, and 900mm alongside stairs. Gaps in the infill must not allow a 100mm sphere to pass through, which rules out widely spaced spindles if you have small children.
Structurally, the post fixing does the work. A newel bolted through a joist or through a stringer with coach bolts will hold; one screwed only to a deck board will not, whatever the balustrade is made of. If your deck is high, attached to the house or forms a balcony, check whether building control approval is needed before anything is ordered, because retrofitting compliant guarding to a finished deck is expensive.
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