Mastic man in Westminster

Mastic and sealant work in Westminster

The City of Westminster has some of the most carefully protected buildings in the country, and sealant work here needs a light touch. Mr Mastic covers the whole of Westminster from our base in Crawley, resealing bathrooms and kitchens, renewing mastic around sash and casement windows, and looking after washrooms in hotels, offices and rented flats.

In a period building, a good reseal should be almost invisible. We remove the old sealant by hand, clean the joint properly and choose a colour that suits marble, tiling or painted joinery, so the finish sits neatly against the original materials. Our colour-matched resealing is often the right choice in Westminster’s older bathrooms, where a stark white bead would look out of place.

Stucco, mansion blocks and landmark post-war estates

Westminster has 56 conservation areas, and much of its housing is period. In Pimlico, Thomas Cubitt laid out a grid of white stucco terraces from the 1820s onwards, with larger houses on St George’s Drive and Belgrave Road and smaller three-storey homes on the side streets. Most are now flats. In Maida Vale, red-brick mansion blocks went up from 1897 to around 1910, and over 90% of households there live in flats. Bayswater, Marylebone, St John’s Wood and Mayfair each have their own mix of period houses and flats.

Older buildings bring sash windows, timber that expands and contracts, and bathrooms fitted into rooms never designed for them. For traditional sash and case windows, sand mastic is often the right material; our sand mastic guide explains why.

Westminster’s post-war estates are protected too. Churchill Gardens in Pimlico, 1,600 homes built between 1946 and 1962, became a conservation area in 1990, and Lillington and Longmoore Gardens is a conservation area in its own right. In these blocks we deal with stacked bathrooms, concrete walls and replacement windows, where neat, durable joints keep flats dry.

What we do in Westminster

• Bathroom & kitchen resealing: Mouldy or split sealant around baths, shower trays, basins and sinks removed completely and replaced with a neat, hygienic bead.
• Window & door mastic: Frame perimeters inside and out resealed with flexible, colour-matched sealant, with backing rod where the gap is deep.
• Commercial & hotel sealant: Commercial washrooms, kitchens and wet areas resealed floor by floor, so only a few rooms are out of use at once.
• Remedial sealant & repairs: Messy, layered or wrong-product sealant cut out and replaced with the right sealant, laid the right way.
• Fire-rated sealant: Gaps in fire-separating walls and floors sealed with fire-rated products, following the tested details for each one.
• External & façade joints: Expansion joints in brick, render and cladding cut out and renewed at the right depth so they can move without splitting.
• New-build mastic & snagging: Early-failing sealant in new homes fixed properly, plus mastic packages and snagging for developers.
• Floor & skirting joints: Gaps under skirting boards, tile movement joints and concrete floor joints sealed with a product that suits the traffic.
• Regrouting: Tired or mouldy grout raked out and renewed, and the internal corners finished in flexible silicone.
• Glazing & conservatory sealant: Conservatory, rooflight, glass panel and shower screen joints resealed with glazing silicone.
• Gutter, fascia & soffit sealing: Leaking gutter joints, end caps, fascia and soffit joints resealed with exterior sealant.
• Sand mastic for sash & case windows: Traditional burnt sand mastic renewed around sash and case windows and doors in stone and brick.

What you get with Mr Mastic in Westminster

Central London buildings deserve careful hands. Mr Mastic is an ARBOMaster approved applicator with 20+ years in the trade and more than 2,847 projects completed. We’re fully insured, we use Arbo and Everbuild sealants matched to each surface, and our 4.9-star Google rating rests on 180+ five-star reviews. We’ll agree a clear quote with you or your managing agent first, and every job is backed by a one-year guarantee.

Places we pass in Westminster

From the centre, the nearest railway station is London Victoria station. Local landmarks include Kingly Court (0.9 miles north), The Crime Museum (less than half a mile south) and Baynard's Castle (1.7 miles north-east). Typical jobs near the centre are in homes and businesses around St Matthew's School, Harris Westminster Sixth Form, Blewcoat School and Christ Church. Nearby green spaces include Barnsbury Wood and Ludgate Hill.