Greater London · England
Mastic man in Bexley
Sealant work for Bexley’s 1930s semis, Victorian villas and riverside flats, from Bexleyheath and Welling to Sidcup, Erith and Belvedere.
- Old sealant cut out, never covered
- ARBOMaster approved
- One-year guarantee on every job
Mastic and sealant work in Bexley
The London Borough of Bexley is mostly suburban family housing, with quiet streets of semis around Bexleyheath, Welling, Sidcup, Blackfen and Barnehurst, older villages at Old Bexley and North Cray, and the riverside towns of Erith, Belvedere and Slade Green to the north. Mr Mastic covers the whole borough from our base in Crawley, so the drive up is straightforward.
Most jobs here are in the family bathroom or the kitchen: a bath seal gone black at the corners, a worktop joint that has shrunk, a shower tray that has started to leak. Outside, we replace hardened mastic around windows and patio doors. Every job starts the same way, with the old sealant cut out completely, because new silicone will not bond to old. Our bath resealing page shows how we do it.
A borough built on the 1930s housing boom
Bexley grew fastest between the wars. Builders such as New Ideal Homesteads laid out large estates around Albany Park in the 1930s, and Blackfen, Lamorbey and part of Falconwood filled with new houses for sale. Many of these semis and terraces now have their third or fourth bathroom, often fitted over the original floors, and we regularly find layers of old sealant, baths that have dropped slightly and uPVC frames whose mastic has dried out after decades in the sun.
Older homes sit alongside them. Bexleyheath grew as a Victorian suburb on former heathland, and Upper Belvedere, Old Bexley and parts of Sidcup have Victorian and Edwardian houses; the council lists 23 conservation areas, including Old Bexley, Christ Church and The Green in Sidcup, Lesney Park Road in Erith and Woolwich Road in Upper Belvedere.
In the north, Erith’s riverside was cleared in the 1960s for council tower blocks, and many new riverside flats have followed since the late 1990s. Part of Thamesmead, including its South and East areas, also lies in Bexley, with concrete blocks from the late 1960s and newer brick homes. Whatever the age of your home, our guide to how long silicone sealant lasts will help you judge when a tired bead is due for replacement.
From suburban semis to Erith’s riverside blocks
On a suburban house, access is easy, but the outside joints take years of sun and rain. Mastic around bay windows, patio doors and where render meets brick often cracks and lets damp in, so we cut it out and use a flexible, weatherproof sealant with backing rod where the gap is deep. Our page on external joints explains why that matters.
The blocks in Erith and Thamesmead are different. We check lift access, parking and any rules from the housing association or managing agent before we come, and we pay particular attention to shower trays and bath panels, since a failed seal in a block can soon mark the ceiling of the flat below. Riverside buildings also take more wind-driven rain, which is hard on balcony door sealant.
Shops, care settings and rentals around Bexley
Bexleyheath is one of London’s major town centres, with the Broadway Shopping Centre, restaurants along the Broadway and the council’s Civic Offices, and Sidcup, Welling and Erith have their own high streets. Shops, cafés and offices need sealant renewed in staff washrooms and kitchens, and we can work early or late to avoid opening hours.
Queen Mary’s Hospital in Sidcup is a community hospital, and the borough has many care homes and surgeries where washroom sealant needs to stay clean and sound. We also reseal for landlords and letting agents between tenancies across the borough.
From first call to finished joint
- Tell us about the job. A quick call or email with what needs sealing and where. Photos help us quote accurately.
- Agree the price. You get a clear quote up front, and we book a date that suits you.
- Cut out and prepare. All the old sealant comes out, and the joints are cleaned, treated and dried.
- Lay the new bead. We apply the right product for each joint and tool it to a clean, even line.
- Leave it to cure. We tell you how long to leave it before use, and the work carries our one-year guarantee.
Sealant services across Bexley
- Bathroom & kitchen resealing: Baths, showers, basins, wet rooms, worktops and sinks: old sealant cut out, mould treated and a new bead of anti-fungal silicone laid.
- Window & door mastic: Hardened, gappy mastic around frames, sills and French or patio doors cut out and renewed to keep draughts and rain out.
- Commercial & hotel sealant: Sealant programmes for offices, hotels, care settings and schools, with early or late working where it helps.
- Remedial sealant & repairs: Messy, layered or wrong-product sealant cut out and replaced with the right sealant, laid the right way.
- Fire-rated sealant: Intumescent and fire-rated joints around pipes, cables and frames, installed to the manufacturer’s tested specification.
- External & façade joints: Outside movement joints given new backing rod and a flexible, weatherproof sealant in a colour to match the wall.
- New-build mastic & snagging: Early-failing sealant in new homes fixed properly, plus mastic packages and snagging for developers.
- Floor & skirting joints: Movement joints in tiled and concrete floors, and skirting gaps, sealed so they stay tidy and keep dirt out.
- Regrouting: Crumbling grout in showers and wet areas raked out and refilled, so water stays out of the wall behind.
- Glazing & conservatory sealant: Leaking conservatory and rooflight joints, glass panels and shower screens resealed with silicone made for glass.
- Gutter, fascia & soffit sealing: Gutter unions, outlets and fascia joints that leak in heavy rain cleaned and resealed.
- Sand mastic for sash & case windows: Traditional sand mastic for period windows and doors where a modern sealant would look out of place.
Why choose Mr Mastic in Bexley
Picking a tradesperson for a small job can feel like a gamble, so here is what you get with us. Mr Mastic has over 20 years’ experience, is fully insured and holds ARBOMaster approved applicator status. We seal with Arbo and Everbuild products, and we’ve completed 2,847+ projects with a 4.9-star Google rating from 180-plus five-star reviews. The price is set out in a clear quote before we begin, and a one-year guarantee covers the finished work.
Around Bexley
For trains, Bexley station is closest to the centre. Local landmarks include Broadway Shopping Centre (1 mile north-east) and Bexley Museum (1.1 miles east). Typical jobs near the centre are in homes and businesses around Old Bexley Church of England School, Townley Grammar School, St Columba's Catholic Boys' School and Parish Church of St John the Evangelist. For open space, Wansunt Pit and Summer Hill are close by.
What customers say
Rated 4.9 on Google from 180+ five-star reviews. Read the reviews on Google.
“New build in Forge Wood — shower seal had failed after 16 months. Mr Mastic came out quickly, removed everything and did it properly. Perfect finish and no more leaks.”
“Harper Drive in Maidenbower — kitchen worktop had been leaking behind for a while. Came out the next day, sorted it properly. Really tidy job.”
“Called for a bathroom reseal and the mastic man showed up on time with all the right equipment. Brilliant attention to detail. The sealant looks perfect and they kept everything tidy.”
Parts of Bexley we work in
Pick your area for local details, or call 07833 053749 or email us with your postcode.
Towns near Bexley
Questions we’re asked in Bexley
Do you cover all of Bexley?
Yes. We work in Bexleyheath, Welling, Sidcup, Blackfen, Erith, Belvedere, Crayford, Barnehurst, Slade Green, Old Bexley and the Bexley side of Thamesmead.
My 1930s semi in Blackfen has a bath that keeps pulling away from the wall. What can you do?
We remove the old sealant, check the bath is properly supported, then fill it before sealing so the joint is set where the bath sits when in use.
Can you replace the mastic round my bay window?
Yes. We cut out the old, hardened mastic and use a flexible, weatherproof sealant that copes with the movement of brick, render and frames.
I live in a block in Erith. Do you need anything from the managing agent?
Sometimes. Let us know the building’s rules and we will sort out access and parking in advance.
How long does silicone usually last in a family bathroom?
It varies with use and ventilation, but a well-applied bead normally lasts several years. We can tell you the signs that it needs replacing.
Do you work in shops on Bexleyheath Broadway?
Yes. We can work before or after opening hours to reseal staff washrooms, kitchens and counters.
Do you reseal kitchens as well as bathrooms?
Yes. We reseal worktops, upstands and sinks, using a food-safe product where needed.