Project Overview
This hardwood floor in Wandsworth had been in the property for many years and was showing the typical signs of age: gaps between the boards, a worn and scratched finish, and a generally tired appearance. The owners wanted the floor brought back to a proper standard without replacement, which is a very sensible approach for solid hardwood. A good sanding and refinishing job on a solid wood floor will take it back to brand-new condition, and the floor can be sanded multiple times over its lifetime. Professional floor sanding in London is priced from around £25 to £45 per square metre, with gap filling usually charged on top depending on the extent of the work needed.
The Challenge
The main concern on this floor was the gap situation. Several boards had contracted noticeably, leaving visible gaps of between 3mm and 6mm that were affecting the stability and insulation of the floor and were also collecting dust and dirt. Gaps in a hardwood floor are not just cosmetic; they can allow draughts from below, reduce the thermal performance of the floor and, if left untreated, allow moisture to get in from underneath. The gaps also needed to be filled before sanding, because the filler cures best into a stable, untouched surface rather than on freshly sanded wood. Getting the sequence right was important for a long-lasting result.
Our Approach
Initial inspection and preparation. We checked the whole floor for loose or squeaking boards and secured any that needed it before starting. Squeaking boards cause problems during sanding because they can shift slightly under the machine and leave uneven patches.
Pine sliver gap filling. For the larger gaps, we used pine slivers cut and planed to fit precisely. Pine slivers give a far more stable and durable result than filler paste in wide gaps, and they move naturally with the wood as seasons change. Smaller gaps were filled with the standard resin and wood dust mixture.
Sanding sequence. Starting with a heavy belt sander for the main area and progressing through medium and fine grits, we worked the entire floor to a smooth, even finish. The edging machine and corner scraper then dealt with the perimeter.
Lacquer application. Two coats of a high-quality clear lacquer were applied, with a light flat and buff between coats to ensure a smooth, durable final surface.
The Result
The finished floor was completely transformed. All the gaps had been eliminated, the surface was smooth and uniform throughout, and the lacquer finish gave the wood a rich, clear appearance that highlighted the natural grain. The floor felt noticeably more solid underfoot than before, and the draught issue was resolved. The owners were left with a floor that looks new and will continue to look good with routine care for many years ahead.
Frequently Asked Questions
Do gaps in a hardwood floor always need filling before sanding?
It is generally recommended to fill gaps before the final sanding pass. Filling before sanding allows the filler to be sanded flush with the boards in the same operation, which gives a cleaner result than trying to fill a freshly sanded surface.
How are wide gaps in a hardwood floor filled?
For gaps wider than about 4mm, we cut and fit pine slivers to size. These are glued in place and, once the adhesive cures, planed or sanded flush with the rest of the floor. This method is far more durable than filler paste in wide gaps.
How long will the lacquer finish last?
In a residential property with normal use, a good quality lacquer finish will last several years before showing significant wear. High-traffic areas like hallways may need a re-coat sooner, but the finish can be re-applied without a full sand if it is done before the lacquer wears through to the bare wood.