Custom shelving and bookcases in Adelaide

That whole table comes down to 2 pieces of physics. Deflection rises with the cube of the span, so stretching a shelf from 800mm to 1,000mm does not add 25% of sag, it adds around 95%. Stiffness also rises with the cube of the thickness, which is why going from 18mm to 32mm roughly quintuples what a shelf will carry. The corollary is the useful one: depth in the direction of the load beats material every time, and that is why a 50mm rail glued along the front edge of an 18mm shelf outperforms a solid 32mm shelf while costing a fraction as much.

Load matters as much as span, and people underestimate it badly. A linear metre of paperbacks weighs 15kg to 20kg. A metre of hardbacks weighs 25kg to 30kg. A metre of 12 inch vinyl weighs 50kg to 70kg, which is roughly 3 times the book load and enough to bend a shelf that would have been fine forever holding novels. If records, textbooks or a full run of lever-arch folders are going on it, that is the first sentence of the brief, not a detail mentioned at delivery.

Past 1,000mm the correct answer is not a thicker board. It is a vertical divider, which halves the span and adds structure to the carcase at the same time, or a bulkhead above a wide opening that lets the shelf sit in 2 bays. A maker who offers to go to 1,400mm in 25mm solid because you asked for an uninterrupted run is telling you what you want to hear.

The alcoves beside a villa chimney breast are typically 800mm to 1,200mm wide and 300mm to 400mm deep, and they are never a matched pair. The 2 openings in the same room commonly differ from each other by 20mm to 40mm in width, and each one is often 10mm to 20mm narrower at the top than at the bottom because the wall leans. The 2 units therefore cannot be built to the same cut list, which is why an alcove pair costs more than twice a single unit and why the site measure has to happen before anything is drawn.

Skirtings are the next obstacle. Adelaide villas and bungalows carry deep moulded skirtings, commonly 150mm to 230mm tall, and a cabinet cannot simply sit against one. There are 3 honest options. Scribe the carcase around the moulded profile, which is exact, slow and the most expensive. Cut the skirting out of the opening, which is fast and irreversible, and a poor idea in a house where the joinery is part of the value. Or set the unit forward on a plinth that clears the skirting entirely, which costs the least, takes 20mm to 30mm of floor and almost always looks the most deliberate.

Picture rails sit at 2,100mm to 2,400mm and force the same decision higher up. Stopping the unit under the rail is the simplest and keeps the room reading as original. Running past it means either scribing around the moulding at every intersection or removing that section of rail, and once a rail is cut the room has lost a feature it will not get back cheaply.

One material note specific to this city. A fitted unit is restrained by the walls, so a wide solid timber shelf or a solid panel back cannot move freely, and Adelaide interiors sit under 30% relative humidity for weeks in February when the cooling runs. Fitted shelving is therefore built from veneered or laminated stable sheet stock with solid timber used for edges, face frames and rails. That is not cost-cutting, it is the correct engineering for a piece that is not allowed to move. The species question is covered in the timber guide.