What's inside
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A door-fitting kit needs to handle careful measurement, hinge gains, latch work and small adjustments without filling a tool bag with gear you rarely use. Start with tools that control the cut and reveal, then add a few compact items for holding and correcting the door. The right kit depends on whether you are trimming a new slab, rehanging an existing door or fitting doors regularly.
Start with the job
For a one-off interior door, borrow or buy fewer tools and take time to set them up accurately. A sharp chisel, reliable square and suitable plane will do more than a large collection of inexpensive tools. Regular site work justifies tougher cases, spare marking tools and a second chisel size, because lost time and damaged edges add up.
Before cutting, check the opening and the door’s swing, thickness and handing. Measure the head and both jambs; openings are often out of square, so a single width measurement is not enough. Mark the required clearances against the actual frame and hardware instructions. As a starting point, many interior doors have roughly 2 mm clearance at the sides and top, with more at the floor, but flooring, ventilation requirements and the door manufacturer may call for different gaps.
The compact core kit
| Tool | Useful specification | Why it earns space |
|---|---|---|
| Steel tape | 3–5 m, clear millimetre markings | Measures opening, slab and hardware positions. |
| Combination square | 150 mm blade, checked for square | Transfers hinge and latch marks and checks edges. |
| Marking knife and pencil | Fine knife; sharp pencil | A knife line locates a chisel cut precisely; pencil marks remain easy to see. |
| Bevel-edge chisels | 12 mm and 25 mm | The smaller blade handles hinge corners; the wider one pares broad shoulders and mortises. |
| Block plane | Low-angle or standard; adjustable mouth preferred | Trims an edge in controlled, thin shavings. |
| Hammer or mallet | About 300–450 g | Drives a chisel without requiring a full-size framing hammer. |
| Screwdriver | Correct bit for the supplied screws | Reduces the chance of chewing screw heads during hinge fitting. |
A checked square matters more than an expensive one. Test it by drawing a line along a straight edge, flipping the square and drawing another line from the same point. If the lines diverge, do not trust it for hinge layout. A dedicated 150 mm combination square is a sensible buy if your existing square is loose, hard to read or out of true.
Choose chisels and a plane you can maintain
Two sharp chisels cover most door work. A 12 mm chisel is handy for cleaning the ends and corners of a hinge recess; a 25 mm blade removes waste quickly and pares the broad bottom. A 6 mm chisel can help with small hardware, but it is optional in a compact starter kit. Cheap chisels are adequate for occasional fitting if their backs can be flattened and the bevel sharpened. If the steel will not hold an edge, or the handle loosens after light mallet use, replace it rather than fighting it.
Buy a pair of bevel-edge chisels in sizes you will actually use. Keep the edges covered in transit. A nicked edge tends to crush the hinge-line instead of slicing it, and can leave ragged corners that show after installation.
A small block plane is easier to control on a door edge than a long bench plane. A well-tuned budget plane can work; the trade-off is that it may need setup and sharpening before it takes clean, thin shavings. Check that the blade adjusts without sticking and that the sole does not rock. Take light passes, test the fit, and plane from each end toward the middle to reduce the chance of breaking out the far corner. If you must remove more than a few millimetres, recheck the layout and the door’s permitted trim allowance before continuing.
Mark and cut without oversizing
Position hinges from the frame or a reliable layout, not from an assumption that every door uses identical spacing. Mark the hinge outline with a knife, then score the waste side lightly. Chisel across the grain at the boundary to establish the shoulder; remove the waste in shallow layers, working with the grain where possible. Stop when the hinge leaf sits flush. A recess that is too deep can pull the door out of alignment, while a shallow one leaves the leaf proud and may bind.
Use the hinge itself as a check, but do not hammer it into a tight recess. For screw holes, start with a small pilot hole sized to the screw core and wood; oversize pilots can leave the hinge loose, while no pilot in hardwood can split the edge or snap a screw. Drive screws by hand for the final turns. A power drill is faster, but it can bury the head or strip the slot before you notice.
Keep the kit compact and protected
A tool belt is useful when you are moving between the bench and the doorway, but it is not a substitute for a safe place to set down a sharp chisel. A small pouch holding the tape, pencil, knife, square and screwdriver keeps layout tools close; carry chisels in a roll or a dedicated pocket with edge guards. A basic compact carpenter’s pouch is enough for occasional work. A heavy, multi-pocket belt costs more and can catch on finished trim in tight rooms.
Include a small sharpening stone or diamond plate if you will be fitting more than one door. A blunt edge encourages heavier blows and makes slips more likely. Wipe steel dry after use, especially on damp sites, and keep layout tools together so a misplaced knife does not leave you improvising with a pencil for every cut.
Buy in order, not all at once
If your budget is limited, first get an accurate tape, square, sharp marking knife, one 12 mm chisel, one 25 mm chisel and a plane that can be adjusted. Add a second set of chisels or a better pouch only after the work demands it. Spend extra where poor fit directly affects accuracy: a square that stays true and a plane that holds its setting are worth more than a large assortment of tools with inconsistent edges.
For a single door, a basic but serviceable kit is enough if you verify measurements and sharpen before cutting. For repeated site fitting, prioritize durable handles, protected edges and tools that can be serviced. In either case, make the first cut only after checking the swing, clearances and trim allowance; fixing a mistaken layout usually takes longer than any tool saves.