First fix, second fix, finishing — what each stage actually means

If you’ve had a quote for a renovation or extension, you’ve probably seen the phrases “first fix” and “second fix” come up. They are trade shorthand. Worth knowing what they mean because they set the rhythm of how a job moves.

First fix — the bones

First fix is everything that has to happen before walls get plastered. Stud walls go up. Floor joists get strengthened or doubled. Door openings get framed. Behind the walls, plumbers run pipe and electricians pull cables. Carpenters and joiners cut openings, hang structural timbers, fix noggins where fittings will land later.

Mistakes here are expensive because they get hidden. A pipe run that turns at the wrong angle, a noggin two inches off where a wall-mounted TV needed it — both invisible once the plaster’s on, both a real headache to fix later.

Plastering and decorating sit between the two

Once first fix is done and signed off, the plasterer comes in. Sometimes the electrician and plumber do a “second fix first stage” for things that need to be set into plasterboard before it gets boarded. Painters and decorators usually start once the plaster is dry, sometimes after second fix is complete depending on the trade order.

Second fix — the finished surfaces

Second fix is everything you can see after the build is finished. Light fittings on the wires that were pulled in first fix. Taps and basins on the pipes that were laid in first fix. Doors hung in the openings that were framed in first fix. Skirting and architrave run to the floor and round the doors. Kitchens fitted. Bathrooms tiled and grouted.

This is where the work feels finally like a real room rather than a building site. Most of the visible quality of a job is decided at this stage. It’s also where the difference between a careful tradesman and a hurried one shows up: scribed joins in skirting versus butt-jointed and filled, doors hung true to plumb versus dragging at the bottom, light switches at consistent heights versus three different heights down a hallway.

Finishing — the bit that gets skipped

There’s a third stage that often gets bundled into “second fix” but actually deserves its own attention: finishing. The final coats of paint. The snagging round door frames. The little adjustments that only get noticed after a few weeks of normal use — a door catching, a drawer that’s a touch stiff, a switch plate that needs an extra fix.

Good trades come back for this. Whether it’s called a snagging visit or just “drop by next week” is less important than whether it actually happens.

Why this matters when you’re getting quotes

When you’re comparing quotes for the same job, ask the trades to be specific about which stage they’re doing. A quote for “kitchen installation” should be clear whether it includes the first-fix plumbing and electrical work, whether it includes second-fix tap installation, whether finishing and snagging are bundled or separate.

If a quote skips this detail, the cheap one usually turns out not to be the cheap one once the gaps appear. The dear one isn’t always worth more either — sometimes you’re paying for project management you don’t need.

The version we like best: clear breakdown by stage, separate line items for plumbing and electrical sub-trades, a snagging visit included, and a price that’s fixed unless something genuinely unexpected comes up behind a wall.