How much does interior design cost?

Interior work is quoted per room, per square foot or as a turnkey package, and the joinery quantity drives most of the cost.

Should I pay separately for interior design and execution?

Separating design from execution keeps specifications honest; a combined turnkey price is simpler but harder to audit.

One contract covering design, materials, execution and handover — convenient, but only as good as its BOQ.

Often, but only if structure and services are sound — renovating a weak structure usually costs more than starting again.

It is useful for concealing services, ducting and lighting, but it costs height and money — skip it where neither is needed.

Layer ambient, task and accent light, plan switching before wiring, and specify colour temperature room by room.

Gist of Pages

Interior scope, costs, materials and execution — what to decide before work starts and how to avoid rework.

For Homeowners and renovation clients · Reviewed 2026-10-31