Timber Box Frame Repair Across
South London

London’s climate and the historic age of our local building stock often lead to specific issues within timber sash windows. You may notice rot developing in the bottom rail or the sill, often caused by neglected exterior paintwork that allows moisture to penetrate the timber. Other common signs that your box frame needs attention include windows that are difficult to operate, rattling during windy weather, or sashes that have dropped and no longer sit flush against the meeting rails.

During a survey, we look beyond the surface to examine the internal components. We inspect the state of the pulley stiles, the health of the counterweights, and the condition of the hidden wax-impregnated cotton sash cords. By diagnosing these issues early, we can perform targeted repairs that save your original frames rather than removing them.

We believe in a surgical approach to joinery. Rather than replacing an entire window, we often perform timber splicing to restore the original frame. This involves carefully cutting away rotted sections and grafting in matching, high-quality seasoned timber or durable Accoya. This method preserves the original character and heritage of your home while effectively stopping the spread of rot.

Once the timber is spliced and the profile is restored, we ensure the finish is seamless. This process allows us to maintain the authentic proportions of your windows, which is essential for period accuracy. We finish all repairs with professional priming and sealing to ensure the new timber is as weather-resistant as the original.

A significant part of our box frame restoration involves overhauling the mechanical operation of the sash. If your windows feel heavy or stick, it is often due to internal friction or incorrect weight balancing. We remove the inner linings and pocket covers to clean the weights, replace worn cords, and ensure everything is correctly rebalanced for a smooth, silent glide.

To improve your home’s thermal efficiency, we integrate discreet draught-proofing systems. We machine hidden brush seals into the new parting and staff beads. This creates an airtight seal that eliminates cold draughts and significantly reduces exterior noise, all without altering the visual profile of your historic sash windows.

Working in Westminster and surrounding areas requires a deep understanding of local planning and conservation requirements. Whether your property falls under an Article 4 Direction or is a Grade II listed building, we ensure all repairs comply with local heritage standards. Our work focuses on keeping the existing box frames in place, which is often the preferred route for conservation officers who value the retention of original historic fabric.

We provide the technical documentation required to support your project, ensuring that every modification—from sill repairs to the introduction of double-glazing units—is handled with respect for the building’s history. Our goal is to enhance your comfort while maintaining the architectural beauty that defines these neighbourhoods.