First fix and second fix carpentry explained

Short answerFirst fix carpentry is the structural timber work done before plastering: stud walls, joists, floors, door linings and noggins for fixing things to. Second fix is the finishing work after plastering: hanging doors, skirting, architrave, staircase balustrades, fitted furniture and kitchens. Keeping that order, with electrics and plumbing slotted in between, avoids damage and return visits; typical carpenter day rates outside London are about £160 to £280.

First fix and second fix carpentry explained in one line: first fix is everything the carpenter does before the walls and ceilings are plastered; second fix is everything they do after. First fix is the hidden structure: stud walls, joists, door linings and the timber that other trades will fix things to. Second fix is the visible finish: doors, skirting, architrave, handles, staircase balustrades and fitted furniture.

The same split applies to electricians and plumbers, and understanding it is the key to running a renovation in the right order. Get it wrong and you end up cutting into new plaster for a forgotten socket, or paying a carpenter to come back for a half-day job.

Where first fix and second fix carpentry sit in a renovation

A typical order for a room or whole-house renovation:

1. Strip out and any structural work
2. First fix carpentry
3. First fix electrics and plumbing (cables and pipes run through the new structure)
4. Building control inspections, if the job needs Building Regulations approval (for example a loft conversion or structural alteration), before work is covered up
5. Plastering (boarding and skimming, or backing coat and skim)
6. Drying time
7. Second fix carpentry
8. Second fix electrics and plumbing (sockets, switches, lights, radiators, taps, sanitaryware)
9. Decorating, then flooring

In real life the first fix trades overlap and the carpenter may come back between them. Our guide to the order of trades in a house renovation goes into more detail.

First fix carpentry jobs

First fix is about structure and preparation. Typical jobs:

• Stud partition walls: timber frames for new walls, including openings for doors. See stud wall costs.
• Floor and ceiling joists: new joists, strengthening, or trimming openings for stairs or loft hatches
• Floorboards or chipboard flooring, often laid after pipes and cables run underneath
• Roof timbers for extensions or loft conversions
• Door linings and frames, set square and plumb, ready for the plaster to finish up to them
• Noggins and pattresses: extra timbers in walls so wall-hung units, TVs, radiators, grab rails or heavy shelving have something solid to fix to
• Boxing in for soil pipes and services
• Battens for cladding or panelling
• Loft boarding and hatch openings. See loft boarding cost.

Why first fix matters so much

Mistakes at first fix are expensive later. A door lining set out of plumb means a door that never hangs right. A missing noggin behind a heavy wall cupboard means opening up a finished wall. A good carpenter will ask you, before the plasterer arrives, where everything heavy will be fixed. Have the same conversation with your kitchen fitter, plumber and electrician.

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Second fix carpentry jobs

Second fix happens once plaster is on and reasonably dry. Typical jobs:

• Hanging internal doors, with hinges, latches, locks and handles. See cost to fit internal doors.
• Architrave around door openings
• Skirting boards, scribed to uneven floors where needed. See skirting board fitting cost.
• Staircase finishing: balustrades, handrails, spindles, newel caps
• Fitted wardrobes, alcove units and shelving. See fitted vs freestanding wardrobes.
• Kitchen fitting, including worktops, end panels and plinths
• Bath panels, boxing covers and access panels
• Window boards and trims
• Ironmongery: door stops, coat hooks, curtain pole fixings

A "second fix carpenter" often specialises in this finishing stage. They need to be neat and precise, because everything they do is on show.

Loft conversions and three-storey houses: rules that change the carpentry

Two parts of the Building Regulations affect carpentry on a loft conversion, so it is worth knowing them before first fix starts.

Fire doors (Approved Document B). Once a house has a floor more than 4.5m above ground level, which a loft conversion on a typical two-storey house usually creates, the guidance expects a protected escape route. The usual way is a protected stairway enclosed in fire-resisting construction and leading to an exit, with the doors from habitable rooms onto that stair being fire doors (at least E20, the old FD20 rating). The alternative is a separate escape route from the top storey. In practice that often means replacing existing doors on the landings and hall, not just fitting one in the loft, and the linings need to suit fire doors. Council building control guidance notes that self-closers are generally not needed on these doors in a house. Your building control body or designer will confirm what your layout needs, so agree it before buying doors.

Stairs and guarding (Approved Document K). A new stair for a private house should have a rise of no more than 220mm, a going of at least 220mm and a pitch no steeper than 42°, with 2m headroom (building control can accept less in a loft conversion where space is tight). Guarding on stairs and landings inside a house should be at least 900mm high, and where young children are likely to use the building it should not be easily climbable or have gaps a 100mm sphere could pass through. That matters at second fix, when spindles and balustrades go in.

Fire doors are also fussier to hang than standard doors. Most manufacturers only allow a few millimetres to be trimmed from each edge and expect gaps of roughly 2 to 4mm round the leaf, so the lining must be accurate at first fix.

Why the order saves money

• Fewer return visits. Grouping jobs into a clear first fix and second fix means fewer half-day call-outs.
• No damage to new finishes. Doors and skirting fitted before plastering get damaged and stained.
• Better fit. Skirting and architrave are fitted to the finished plaster line. Fit them before and you get gaps.
• Plaster dries properly. Rushing second fix and decorating onto damp walls risks problems. See how long plaster takes to dry.

How it works with other trades

• Electrician: first fix runs cables and back boxes into stud walls and ceilings before plasterboard goes up; second fix fits sockets, switches and lights. New circuits, consumer units and work in bathrooms are notifiable under Part P, so use an electrician registered with a competent person scheme such as NICEIC or NAPIT. See how to check an electrician is registered.
• Plumber: first fix runs pipes before floors and walls close; second fix connects radiators, taps, toilets and showers. Any gas work must be done by a Gas Safe registered engineer.
• Plasterer: comes after all first fix trades and before second fix. See skimming vs replastering.

In older houses

In older Market Harborough houses, first fix often includes more making good than a new build: levelling up old joists, packing out uneven walls so new linings sit plumb, and working round existing features. If your house is listed, original joinery and structural timbers can be part of what is protected, and works affecting its character need listed building consent, so check before removing anything. Our guide to renovating in a conservation area in Market Harborough explains the rules, and hanging doors in old houses covers one of the most common second fix headaches.

Typical costs

Carpenters may price first and second fix separately, by the job or by the day. Typical UK ranges from 2025/2026 cost guides, outside London:

See our carpenter day rate guide for more. Your actual price always comes from the carpenter's quote.

Getting it right

When we renovated our house we learned how much the order of trades matters, and how much easier everything is when the carpenter, electrician, plumber and plasterer talk to each other. We can introduce you to the carpenter we use. We're not paid for recommendations. We just pass you to people we trust. See carpenters in Market Harborough or carpenter vs joiner.

Message us about a carpenterFree. We pass you straight to the tradesperson we trust.