Plaster Repair & Surface Preparation

Our Approach

Every plaster repair begins with a thorough diagnostic assessment that determines the scope and method of the work to follow. We tap and inspect all surfaces systematically, listening for the hollow sound that indicates plaster has detached from its substrate. We check for active damp using a Protimeter moisture meter, assess whether the existing plaster is lime-based or gypsum by examining its texture and hardness, and inspect lath-and-plaster ceilings for sagging nibs and failing keys. This material identification is critical: applying modern gypsum over old lime plaster traps moisture within the wall, causing both materials to deteriorate and leading to damp problems that can take months to manifest. For period properties, we use hydraulic lime plaster — NHL 3.5 or NHL 5 depending on the exposure and substrate — that breathes with the building fabric, applied in multiple thin coats as traditional plastering practice demands, with each coat allowed to cure before the next is applied. For modern properties with plasterboard or concrete block walls, we use British Gypsum Thistle Multi-Finish and Bonding Coat for a hard, smooth surface that accepts paint perfectly. All repairs are feathered and blended into surrounding areas so that the junction between old and new plaster is completely invisible once painted. We inspect every repair under raking light — holding a work lamp at a low angle across the surface — to reveal any imperfections that would be visible once the final coats of emulsion or eggshell are applied. We allow proper drying times between coats, never rushing the process to meet an arbitrary deadline, because plaster that is painted too soon will always cause problems: bubbling, peeling, and discolouration that requires the entire job to be repeated.

Materials & Brands

Our plaster repair specification is built around the highest-quality materials from specialist British manufacturers. For period properties, we use NHL 3.5 and NHL 5 hydraulic lime from Singleton Birch — the UK's leading lime producer — and Ty-Mawr Lime, a Welsh company specialising in heritage building materials. These hydraulic limes set by chemical reaction rather than simply drying, producing a plaster that is strong, breathable, and compatible with the original building fabric of Georgian and Victorian London properties. Modern repairs are carried out with British Gypsum Thistle Multi-Finish for the final skim coat, Thistle Bonding Coat for building up thickness on solid backgrounds, and Thistle Hardwall for high-impact areas. For fine surface preparation ahead of painting, we use Toupret fine surface filler — a professional-grade product that sands to a perfectly smooth finish — and Gyproc ready-mixed fillers for smaller imperfections. Fibrous mesh tape from Saint-Gobain is bedded into crack repairs to bridge the movement and prevent recurrence, while self-adhesive scrim tape reinforces joints between plasterboard sheets. Unibond PVA is used to control suction on porous backgrounds and ensure proper adhesion of new plaster to existing surfaces. Where damp has been an issue, we apply Dryzone or Sovereign damp-proof cream to rising damp areas before replastering.

Property Considerations

Georgian and Regency properties in Mayfair and St James's often have original lime plaster that has survived two hundred years or more — our role is to repair sensitively using compatible materials, not to hack off and replace wholesale with modern gypsum. These lime plaster walls are part of the building's heritage and contribute to its character, its breathability, and in listed buildings, its legal protection. Listed properties may require specific consent for plaster repairs, particularly where decorative plasterwork, cornicing, or ceiling roses are involved, and we prepare detailed method statements for conservation officers when needed. In Victorian terraces across Chelsea, Kensington, and Fulham, lath-and-plaster ceilings are a common feature that requires specialist knowledge to repair without causing further damage — we stabilise failing sections with plaster washers and bonding agent rather than replacing the entire ceiling where possible. In mansion blocks, we coordinate access with managing agents, use the goods lift for materials, and work within the noise restrictions and permitted hours that communal buildings require. New-build properties in developments across Battersea, Nine Elms, and the City occasionally require remedial plastering where developer finishes — thin skim coats, poorly taped joints, and visible trowel marks — fall short of the standard expected by our clients.

Frequently Asked Questions