Design Millwork

Joinery is where a small practice's drawings get tested, because the shop prices exactly what is drawn and asks about everything that is not. The two things that come back as questions are always the same: what it fixes to, and what happens where it meets a building that is not straight.

Workflow

Step 1. Take the use, and who uses it standing or sitting

Ask, in one message:

1. What is it for, and what happens at it? Standing, sitting, both, from one side or two?
2. Who uses it: staff, public, children, someone seated in a wheelchair? Does the accessibility standard apply, and can you quote the relevant part?
3. What goes in it, and how much? Weight and size, not "storage".
4. Where is it, and what does it meet on each side and above?
5. What is the wall behind it made of, and is there backing?
6. Does it need power, data, water, waste, or ventilation?
7. Is it fixed, or could it be loose furniture instead?

Question 7 is asked first for a reason. Built-in is expensive, permanent, and often chosen by habit. If loose furniture would do it, say so; the saving is real and it is a budget-reconciliation item.

Step 2. Fix what it does before what it looks like

Element	What it has to do	Dimension needed from you

Work through the functional requirements: working height, reach, what has to be seen over or not seen over, what has to be reached from a seated position, door and drawer swings and what they hit, what has to be lockable, what has to be cleanable underneath.

Leave every dimension as a question. Where the accessibility standard governs one, name the provision to quote rather than the figure.

Step 3. Work every junction with the building

This is the step that decides whether the shop can build it. The building is not straight, not level, and not square, and the joinery is.

Junction	What it meets	Tolerance strategy	Who takes up the difference

• Floor. Is there a plinth, a recessed toe, a scribe? Existing floors slope; a long run against one shows it. Point at existing-conditions-survey.
• Wall, each end. Scribes, filler pieces, or a shadow gap. A shadow gap forgives everything and has to be drawn deliberately, not left as a gap.
• Ceiling or the top. Does it reach, and if it stops short what closes the gap and how is the top cleaned?
• Adjacent joinery, and whether it is the same shop.
• Anything that passes through: a column, a pipe, a sprinkler, a switch.

Name who takes up the difference at every junction. A drawing that shows a joinery unit and a wall meeting with a line has not decided, and the answer will be decided on site by whoever gets there first.

Step 4. Work what holds it up

• What does it fix to: studs, blocking, masonry, floor?
• Is the backing there? Backing has to be located before the wall closes, so it belongs on the partition drawings and not only here. Point at design-partition.
• Anything wall-hung and heavy, anything a child could climb, anything with a drawer full of files: name it as a question for the engineer rather than assuming the wall takes it.
• Anti-tip and seismic restraint where required, quoted.

Step 5. Work the services in it

Every built-in with power in it becomes a coordination item:

• Where power, data, water and waste come from, and whether they arrive in the wall or the floor.
• Whether anything needs ventilation: a fridge, a printer, equipment in a cupboard.
• Whether anything needs access for service, and what has to be removable.
• Where the switches, outlets and cutouts land, and whether they are visible.
• Sinks and taps: the plumbing has to be coordinated with the carcass, and the cutout is the shop's from a template.

Step 6. Draw the line between the drawing and the shop

Say which decisions belong to which, explicitly, because leaving it implied produces either an over-drawn detail nobody reads or an under-drawn one that gets built wrong:

Decision	Drawing's	Shop's

Generally the drawing owns: what it does, the overall geometry, the material and finish, the junctions with the building, the reveals and shadow gaps, and anything visible. Generally the shop owns: carcass construction, joint methods, hardware selection within a stated performance, and how it is broken down to fit through the door.

Say how it gets into the room. A unit that cannot pass the door or the lift comes in pieces, and where the joints fall is a design decision if any of them are visible.

Step 7. Report

The function table, the junctions with who takes up the difference, the fixings with backing flagged, the services, and the drawing-versus-shop line. Then:

• Every dimension still open, with who supplies it.
• Every junction where nobody takes up the difference.
• Whether backing has reached the partition drawings.
• What is a question for the engineer.
• Whether loose furniture was considered.

Then ask whether to write it to a file and where.

Rules

• Never supply a dimension, a clearance, or a hardware selection.
• Ask whether it could be loose furniture, every run.
• Every junction names who takes up the difference between straight joinery and a building that is not.
• Backing is located on the partition drawings, not only here.
• Say how the unit gets into the room.
• Draw the drawing-versus-shop line explicitly.
• Never assume a wall can carry something hung on it.

Anti-patterns

• Drawing joinery meeting a wall with a single line.
• Assuming the floor is level along a long run.
• Specifying a counter height from memory.
• Leaving backing to the contractor to work out.
• Detailing the carcass, which is the shop's and better than yours.
• Under-drawing the visible junctions and over-drawing the hidden ones.
• Designing a unit that cannot get into the room.
• Building in what furniture would have done.

Resources

None. This skill is one file. Output is written directly at the path you choose.