Externally
- The structure is now able to be secured, hence the term lock-up. All external doors and windows have been installed. In some cases, external door openings are secured temporarily to prevent damage to specialist timber frames and doors, but generally all glazing and glass sliding doors have been fitted.
- Rendering of the external walls (if part of the proposed structure) may be complete at this stage but painting or texturing comes later.
Internally
- First fit plumbing and electrical (pipes and wires have been run but are not functional).
- Wall plastering and ceilings have been installed.
Generally, the structure is ready internally for the finishing trades such as carpenters, electricians, cabinet makers, tilers, plumbers and painters.