How do I match a replacement board to old floorboards?

A floorboard laid before the middle of the twentieth century was cut to imperial sizes and has since shrunk, so it matches nothing in a modern rack. It has also darkened for a century under wax, sunlight and traffic. Both problems are solvable, but only in the right order — nobody has ever fixed a thickness mismatch with stain.

What you'll need

• an offcut of the original board
• a vernier gauge or a good rule
• stain and a brush for sampling (optional)
• a plane (optional)

Step by step

1. Measure the thickness accurately.Take it at several points — old boards are not consistent. A common original thickness sits close to but not on modern stock sizes, which is why you measure rather than assume.
2. Measure the width and the tongue position.The exposed face width matters visually; the overall width including the tongue matters for fitting. If the boards are square-edged rather than tongued, note that too — the repair method changes.
3. Identify the species.Most UK floorboards are softwood — pine, redwood or whitewood — and the grain, knot pattern and resin content vary a lot between them. Pitch pine, common in Victorian houses, is denser, darker and quite distinctive.
4. Look for reclaimed stock first.A reclamation yard, an architectural salvage supplier or an online marketplace will have boards of the right age, thickness and species. Aged timber matches aged timber in a way new timber never quite does.
5. If buying new, buy oversize on thickness.A board slightly too thick can be planed down at the ends or bedded on packers; a board too thin has to be packed under every bearing, which is fiddly and creaks.
6. Test the colour on an offcut, not the floor.Cut a piece of the replacement, sand it to the same grit as the surrounding floor and try stains on it. Old pine has an orange-brown depth that usually needs a warm stain rather than a dark one.
7. Match the sheen, not just the colour.A hundred-year-old waxed floor has a soft, low sheen. A new board finished in a modern satin lacquer reads as new even at exactly the right colour. Finish the repair in the same product as the rest of the floor.
8. Accept that it will be slightly wrong, and place it accordingly.Put the newest-looking board where furniture, a rug or a doorway breaks the sightline, and put your best match in the middle of the room where the eye lands.

Tips

• Boards darken further over the first year or two after fitting, so a repair that looks slightly too light after finishing often becomes a good match on its own.
• Check every reclaimed board for old nails, screws and grit before it goes near a saw blade or a planer. One hidden nail ruins a blade instantly.
• If the floor will be covered, none of the colour work matters — match thickness and width and move on.

Questions people ask