Buying exterior materials online: a project-planning checklist

Ordering boards on a website is easy. Owning the specification is not. If you buy supply-only, you typically take on quantity, colour batch, trim completeness, storage on site, and the risk that the system cannot be fitted as certified. An installer who did not specify the order may refuse to fit it — that is a commercial fact pattern, not a slight.

This checklist assumes you already have (or are getting) a written specification: system name, lengths, trims, fixings, membranes, cavity barriers if required, and a note on the substrate. If you do not have that, stop and obtain it before you checkout.

Delivery times, restocking fees and return windows are merchant-specific. Read the terms attached to the order you are actually offered and save a dated copy.

Elevations are not rectangles. Openings, eaves projections, steps in the wall, meter boxes and sloping ground all change the quantity. A simple height-times-width calculation almost always under-orders trims and often under-orders boards once cuts and waste are included.

Ask the system literature what waste factor the manufacturer discusses, then treat that as a prompt rather than a promise for your layout. Record each elevation separately. Photograph a tape against a known opening so a supplier can sanity-check your numbers.

If a website’s calculator only asks for “square metres”, it is not designing junctions. You still need head, sill, corner, starter and window trims counted as items.

A sample viewed under a shop’s lights will not match a west elevation at 4pm in November. Order the largest sample the supplier will send, including a joint or trim if the system uses a visible joint. View it dry and wet, in shade and in sun.

Ask whether the production colour is a batch. Ask how long they will hold that batch if you order in two drops. A second drop that does not match is a project problem, not a minor complaint.

Do not assume “white” or “anthracite” is a single colour across brands. Do not assume a fascia will match a cladding board because both are described as the same colour name.

Exterior boards are long, heavy and easy to damage. Check kerbside versus booked unloading, whether a hi-ab is assumed, and whether your street allows the vehicle. Flats, narrow lanes and controlled parking are frequent failure points.

Ask where materials will be stored, off the ground, dry, and away from work that could scratch a face. Warped boards stored on an uneven patio are not a manufacturing defect.

If you will be away on the delivery day, you do not have a delivery plan. Check the merchant’s missed-delivery and damage-on-arrival process before ordering.

Your order confirmation should repeat the system name, finish, length, pack contents and any fire or structural certificate identifier the supplier claims. If the confirmation says “equivalent” or “similar”, ask equivalent to what, and who accepts the substitution.

Fixings, membranes, starter trims and colour-matched screws are often separate line items. A complete-looking board price can still be an incomplete system.

Keep PDFs of the technical sheet that applied on the day you ordered. Manufacturer pages change, and a dated copy may matter if a dispute later arises.

Distance-selling rules for consumers in the UK are a legal topic and are not summarised here as advice. Read the merchant’s terms and current official guidance before you rely on a cooling-off period.

Bespoke lengths, cut packs and special colours are frequently excluded from ordinary returns. Assume you cannot send a whole elevation back because you mis-counted corners.

Photograph packaging and any transit damage before the vehicle leaves, if it is safe to do so. After the vehicle has gone, many arguments become your word against a completed docket.

Know whether you are buying from a retailer, a distributor or a marketplace seller using someone else’s storefront. The returns address and the name on the invoice should match the name you thought you were dealing with.

VAT treatment can change the comparison between quotes. Confirm what is included on the supplier’s invoice and seek professional tax advice if your situation is unclear.

Large deposits for stock that has not been allocated to a batch are a risk. Staging payment against a written programme is a commercial point to raise, not a rule we can set for every merchant.

If nobody has seen the wall, if the height or fire strategy is unclear, if you cannot store the materials, or if the only “specification” is a photo from a social network, do not checkout. A site visit is cheaper than a wrong elevation.

If the work needs scaffolding over a pavement, licences and dates may gate the whole project. Materials arriving four weeks early then sitting in the rain is not a saving.