Second Fix

Second fix is the finishing phase of a renovation where all the visible fixtures and fittings are installed. It happens after first fix (the hidden infrastructure) and after plastering, when the walls and ceilings have a smooth, finished surface. Second fix is when a building site starts to look like a home.

What happens during second fix

Electrical second fix

• Sockets and light switches fitted to the back boxes installed during first fix
• Light fittings hung
• Consumer unit (fuse board) cover fitted
• Smoke and CO detectors installed
• Final connections and testing

Plumbing second fix

• Taps, basins, and sinks connected
• Toilets and bidets installed
• Showers and baths fitted and connected
• Radiators hung and connected (or underfloor heating thermostats fitted)
• Boiler commissioned and tested

Carpentry second fix

• Doors hung on their linings
• Skirting boards and architraves fitted
• Fitted furniture and shelving installed
• Kitchen cabinets and worktops (sometimes treated as a separate trade)
• Staircase balustrades and handrails

Decorating

• Painting and wallpapering (sometimes overlaps with second fix)
• Tiling — splashbacks, bathroom walls and floors

Why second fix matters

Second fix is when the quality of the finish becomes visible. Poor second fix work shows — gaps in skirting boards, wobbly door handles, light switches that aren’t level. This is the phase where attention to detail counts most.

Tips for homeowners

• Choose all fixtures and fittings well before second fix begins — delays waiting for materials slow the whole project
• Be available for decisions — your general contractor may need you to confirm exact positions for items like towel rails or mirrors
• Visit regularly — this is the phase where you can spot issues before they’re harder to fix
• Start your snagging list — keep notes as second fix progresses rather than waiting until the end

Second fix is usually the final major construction phase before practical completion.