The alcove had a cast iron radiator on the left, a steel beam dropping 8 in below the ceiling across the back, and a chimney breast that leaned out 5/8 in over its height. The client wanted floor-to-ceiling shelving with a flush face. All three obstacles were visible in the room and none of them were on the drawing that arrived with the enquiry. Fitted work in an old house is mostly the art of deciding which irregularity to hide, which to absorb, and which to turn into the point of the design, and that decision has to be made before any material is ordered.
Radiators and anything else that needs air
A radiator inside a joinery enclosure loses output, and the loss is not trivial — restricting convection can cut effective heat delivery substantially unless the cabinet is designed for airflow, with a grille or open area at the bottom and a generous outlet at the top, plus a reflective surface behind. Pipework needs access, since valves eventually leak and nobody thanks a maker for a permanently sealed box over a compression fitting. Clearances to heat-producing elements are a code question as much as a comfort one, and the model codes published through bodies such as the International Code Council are the reference for clearance and combustible material requirements that local jurisdictions adopt. Removable panels, fixed with turn buttons rather than glue, solve the maintenance half of the problem cheaply.
Beams, bulkheads and ceilings that are not flat
A dropped beam is a decision point: run the joinery up to the underside of the beam and treat the beam as the ceiling, or run past it with a scribed panel and lose the depth. The first reads deliberate, the second reads like a mistake unless the beam is expressed elsewhere in the room. Ceilings themselves are rarely level — 1/4 to 1/2 in of variation across a 12 ft span is common in a settled house and much more in some. A full-height unit therefore needs a scribed top rail 2 to 3 in deep, or a deliberate shadow gap of 3/4 in or so that simply ignores the variation. What never works is butting a machined edge to an undulating plaster line and hoping caulk will fix it.
Walls that lean, bow and wander
Three separate faults, often present together. A leaning wall is out of plumb by a consistent amount top to bottom, which the carcase can be shimmed against and the scribe can absorb. A bowed wall is worse, because it changes across the width and a single straight scribe cannot follow it — that needs either a scribe strip planed to the curve or a shadow gap. A wandering wall, where plan position changes as you move along it, affects depth rather than face, so shelves cut to one length will show a varying reveal at the back. Measuring all three means taking dimensions at three heights and three positions, not one measurement at waist level, and recording which way the error goes.
Designing the tolerance in
The professional answer to all of this is to decide, on paper, where the discrepancy will be absorbed, and to put that decision in the drawing. Scribe strips at both ends, a separate plinth scribed to the floor, a scribed top rail at the ceiling, shadow gaps where the deviation exceeds what a scribe can plane away — typically more than about 3/4 in. The corollary is that the piece is drawn slightly undersize with the sacrificial material shown, and the overall face dimension is nominal. Clients occasionally object to shadow gaps as a cop-out. Shown the alternative — a tapering caulk line — they change their minds. Old pieces coming back into a room raise the same questions, and the choice between restoring an inherited piece and building new often turns on whether the old piece can be made to sit properly in a room built to different dimensions.
Frequently asked questions
How much out of plumb is too much for a scribe? Beyond roughly 3/4 in across the height of a unit, the scribe strip gets so wide that it distorts the proportions of the end stile. At that point the wall gets packed and skimmed, or the design changes.
Can shelving be built around pipework without boxing it in? Yes, by notching shelves individually and leaving the pipe visible, which is honest and easy to service. It looks best when the notches are cut cleanly and deliberately, not fudged.
Does a floating shelf work on an old lath and plaster wall? Only where fixings can reach solid timber or masonry behind. Plaster alone carries almost nothing, so the fixing plan has to be worked out from what is actually behind the wall rather than assumed.