Greater London · England
Mastic man in Croydon
Resealing and window mastic for Croydon’s town centre flats, South Norwood terraces, Selsdon and Purley suburbs and New Addington homes.
- Old sealant cut out, never covered
- ARBOMaster approved
- One-year guarantee on every job
Sealant jobs we do in Croydon
Croydon is one of London’s biggest boroughs, running from Crystal Palace and Norbury in the north to Coulsdon, Kenley and Sanderstead in the south. It has tall blocks of flats around East Croydon, long Victorian streets in Thornton Heath and South Norwood, and leafy suburbs on the hills towards the North Downs. Mr Mastic is based in Crawley, straight up the A23, and covers all of it.
We reseal baths, showers, kitchens and basins, replace failed window and door mastic and seal external joints. Each job starts with removing the old sealant completely, because new silicone will not stick to old. Not sure how long a fresh bead should last? Our guide on how long silicone sealant lasts gives honest answers.
From Victorian streets to town centre towers
South Norwood grew quickly in the Victorian era and is now a conservation area, and Victorian and Edwardian terraces fill much of Thornton Heath, Selhurst and Norbury. Many have been converted into flats, with a bathroom stacked above the kitchen or living room of the flat below. In these homes the bath and shower seals do a lot of work, and we check them closely.
Further south, Purley grew fast in the 1920s and 1930s and Selsdon has many interwar Art Deco houses. New Addington began in 1935 as a garden village by the First National Housing Trust, and Croydon’s council later added the Fieldway estate, completed in 1968. Houses from these years often have replacement windows whose mastic is now brittle, and bathrooms with sealant that has been patched rather than renewed.
Central Croydon is changing fast. New blocks such as Saffron Square have gone up near the town centre, and there are plans to convert the 1970 office towers Lunar House and Apollo House on Wellesley Road into flats. New and converted flats often have small bathrooms without windows, so steam lingers and sealant mould follows. Anti-fungal silicone and a good extractor make the difference; see our anti-mould resealing page.
Tall blocks, hillside houses and access
Croydon jobs vary a lot depending on where you live. In the town centre towers, we plan around lifts, loading and building rules, and we take extra care with any joint above another flat. Some blocks ask contractors to book in with the concierge or managing agent first, and we are happy to do that.
In the southern suburbs, houses are larger and often sit on sloping plots, which can make outside window and door joints harder to reach. We tell you honestly what can be done safely from the ground or a ladder before we quote. In conservation areas such as South Norwood, we choose sealants that suit older timber and brick and won’t spoil the look of the frames.
Offices, retail parks and rented flats
Croydon has one of the largest office markets outside central London, a major shopping and retail area along the Purley Way, and Croydon University Hospital in Thornton Heath. Offices, shops, clinics and colleges such as Croydon College all have washrooms, kitchens and entrances that need sealant renewed from time to time, and we can work early or out of hours by arrangement.
With so many flats in the borough, landlords and letting agents are a large part of our Croydon work. We reseal between tenancies and when tenants report mould, and can quote for several properties together.
How it works
- 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.
- Preparation first. Old sealant out completely, surfaces cleaned, mould treated and the joint left dry.
- Lay the new bead. We apply the right product for each joint and tool it to a clean, even line.
- Cure and guarantee. We tell you when it can be used, and every job has our one-year guarantee.
Jobs we take on in Croydon
- 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: Cracked or shrunken mastic around window and door frames, sills and patio doors replaced with a weatherproof sealant.
- Commercial & hotel sealant: Hotels, offices, washrooms and welfare areas resealed room by room, with out-of-hours working possible to arrange.
- Remedial sealant & repairs: Leaks and lifting beads from earlier sealant jobs put right, starting with finding out why they failed.
- 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: Outside movement joints given new backing rod and a flexible, weatherproof sealant in a colour to match the wall.
- New-build mastic & snagging: Failed builder sealant in new homes put right, and plot mastic 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: Cracked, stained or crumbling grout raked out and replaced, with corners resealed in silicone.
- Glazing & conservatory sealant: Conservatory, rooflight, glass panel and shower screen joints resealed with glazing silicone.
- Gutter, fascia & soffit sealing: Exterior joints at gutters, fascias and soffits resealed to stop drips and staining down the wall.
- Sand mastic for sash & case windows: Traditional sand mastic for period windows and doors where a modern sealant would look out of place.
What you get with Mr Mastic in Croydon
Croydon is close to our Crawley base, so it is easy for us to get to. More than 20 years in the trade, full insurance and ARBOMaster approved applicator status sit behind every job we do here, and we use Arbo and Everbuild products matched to the joint. With 2,847+ projects completed and a 4.9-star Google rating from over 180 five-star reviews, you know what to expect. We agree a clear quote first and back the work with a one-year guarantee.
Getting around Croydon
The nearest station to the town centre is South Croydon station. Places most people will know nearby are St George's Walk (less than half a mile north) and Croydon Airport Visitor Centre (1.2 miles south-west). Closer in, we work on homes, rented flats and businesses near Heathfield Academy, Cambridge Tutors College, Rutherford School and St Andrew's. Green spaces within reach include Roundshaw Downs and Duppas Hill.
What customers say
Rated 4.9 on Google from 180+ five-star reviews. Read the reviews on Google.
“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.”
“We had old mastic that needed replacing throughout our kitchen and bathrooms. The mastic man professional was knowledgeable, quoted fairly, and delivered excellent quality work. Highly recommend!”
“Professional mastic man service from start to finish. They assessed the work properly, gave a clear quote, and executed the job perfectly. Very satisfied with the results.”
Areas of Croydon we cover
Find your area below, or call 07833 053749 or email us with your postcode and a few details.
- Addiscombe
- Ashburton
- Bandonhill
- Beddington
- Broad Green
- Coombe
- Old Town
- Roundshaw
- Russell Hill
- Shirley Oaks
- South Croydon
- Waddon
- Woodside
Nearby towns we cover
Questions we’re asked in Croydon
Do you cover all of Croydon?
Yes. We work across the borough, including central Croydon, Addiscombe, Thornton Heath, South Norwood, Norbury, Selsdon, Sanderstead, Purley, Coulsdon, Kenley and New Addington.
I live in a town centre flat with no bathroom window. How do I stop the sealant going mouldy?
We use anti-fungal sanitary silicone, and running the extractor fan during and after showers helps it stay clean much longer.
Can you work in a high-rise block?
Yes. We’ll check lift access, parking and any building rules when you book, and liaise with the concierge or managing agent if needed.
My 1930s house in Purley has old window mastic. Can you replace it?
Yes. We cut out the old mastic, use backing rod where the gap is deep and apply a flexible, weatherproof sealant to match the frames.
Do you work in Croydon offices out of hours?
Out-of-hours visits can be arranged for commercial jobs, so washrooms and kitchens are done when staff are away.
I manage several rented flats in Croydon. Can you quote for all of them?
Yes. We can visit a batch of properties and give a clear quote for each.
Do I need to be home while you work?
Someone needs to let us in, but you don’t need to stay in the room. Many customers carry on working from home while we reseal.