If you’re planning an extension, renovation, or new build, you’ve probably come across the term first fix joinery and wondered exactly what it means. At Craig Smith Joinery, we’ve carried out first fix work across Nottinghamshire for over 30 years, so here’s a clear, straightforward explanation, no trade jargon.
What Is First Fix Joinery?
First fix joinery is the structural carpentry work carried out before walls are plastered and floors are finished. It’s called “first fix” because it happens first, before any of the visible, decorative joinery goes in.
In simple terms, first fix is the skeleton of a building’s timberwork. It includes anything that needs to be in place before plasterers, electricians, and plumbers finish their work, and before the room starts to look “finished.”
First Fix vs Second Fix Joinery
A lot of homeowners get these two mixed up, so here’s a quick side-by-side comparison.
| First Fix Joinery | Second Fix Joinery | |
| When it happens | Before plastering and flooring | After plastering, once walls and floors are finished |
| What it includes | Stud walls, floor joists, staircases, door linings | Skirting boards, fitted units, doors, architrave |
| Visible to the client? | Mostly hidden once complete | Fully visible, finished look |
| Focus | Structure and support | Finish and appearance |
Both stages matter just as much as each other. Good first fix work sets up everything that follows, including any bespoke cabinetry or fitted storage added later.
What Does First Fix Joinery Actually Involve?
Depending on the project, first fix joinery can include:
- Stud walls and partitions – building the internal timber frames that divide up a space
- Floor joists and decking – laying the timber structure that floors will later sit on
- Staircases – fitting the basic structure, even if the final finish comes later
- Door linings and frames – installing the frames that doors will eventually hang in
Most first fix jobs involve a mix of all of these, rather than just one task on its own, especially on extensions and full renovations.
How Long Does First Fix Joinery Take?
For a standard extension or renovation, first fix work typically takes a few days to a week, depending on the size of the project and how much structural work is needed. Larger builds or more complex layouts can take longer.
Common First Fix Mistakes to Avoid
One of the most common issues we come across, whether it’s from DIY work or other trades, is not checking timber moisture and drying properly before fixing it in place. Timber that’s too damp when it’s fixed can shrink, warp, or crack later on, which causes problems once the second fix and finishing work goes in.
A few other things worth getting right at this stage:
- Checking stud spacing matches what any fitted units will need later
- Making sure everything is level and plumb before moving on
- Coordinating properly with electricians and plumbers so wiring and pipework line up with the timber structure
Getting first fix right the first time saves a lot of headaches (and cost) further down the line.
What Does First Fix Joinery Cost?
Costs vary depending on the size and complexity of the job, but as a general UK guide, first fix joinery is often priced by the day or as part of a wider carpentry package, rather than as a standalone fixed cost. Simple stud walls and door linings sit at the lower end, while jobs involving staircases or more complex floor structures cost more due to the extra time and materials involved.
For an accurate figure, it’s always best to get a quote based on your specific project, since timber costs and site conditions can shift the price quite a bit.
A First Fix Project From Our Experience
One recent renovation we worked on involved building new stud partitions to divide a large open room into two separate spaces, along with new floor joists to level out an uneven original floor. Getting the timber properly acclimatised to the site before fixing was key here, since the property had damp issues that needed addressing first. Once first fix was complete, it set up perfectly for the fitted storage that went in during second fix.
Good catch, sorry about that. Here’s the corrected FAQ section (this fixes it going forward too):
FAQs
Is first fix joinery the same as carpentry?
First fix joinery is a type of carpentry work, specifically the structural timber work done early in a build. Carpentry is the broader trade that covers both first and second fix work.
Can I skip first fix and go straight to second fix?
No. First fix creates the structure that second fix relies on. Skipping it isn’t possible on any proper build or renovation.
Do I need a joiner for first fix, or can a builder do it?
Many builders handle basic first fix work, but a specialist joiner brings more precision, especially useful if you’re planning bespoke cabinetry or fitted storage later, since the first fix needs to be set up correctly to support it.
How do I know if first fix work has been done properly?
Everything should be level, plumb, and securely fixed, with dry, properly acclimatised timber. If in doubt, an experienced joiner can inspect it before plastering covers it up..
Final Thoughts
First fix joinery might be the part of a build nobody sees once the plaster and paint go on, but it’s what everything else depends on. Get it right, with properly dried timber, accurate levels, and good coordination with other trades, and the second fix, from skirting to bespoke fitted storage, goes in smoothly. Get it wrong, and problems show up later, often after the walls are already closed up.
If you’re planning a renovation or extension in Nottinghamshire, it’s worth having someone experienced handle first fix from the start, especially if bespoke cabinetry or fitted storage is part of the plan further down the line.
Thinking about an extension, renovation, or bespoke fitted storage project? With 30 years of hands-on experience across Nottinghamshire, Craig Smith Joinery handles both first and second fix work to the same high standard. Get in touch for a quote and we’ll talk through what your project needs.