Hertfordshire · England
Mastic man in Stevenage
Resealing and mastic work for Britain’s first New Town, from Bedwell and Broadwater terraces to Great Ashby family homes and the Old Town High Street.
- Anti-fungal silicone as standard
- 20+ years in the trade
- Guaranteed for a year
Sealant jobs we do in Stevenage
On 1 August 1946 Stevenage became the first town designated under the New Towns Act, and most of its houses were built in a few busy decades afterwards. That means a lot of homes of a similar age, many now on their second or third bathroom. Mr Mastic covers Stevenage from our base in Crawley, another New Town, so the layouts and building styles here are familiar to us.
We reseal baths, showers and kitchens, replace window and door mastic, and seal external joints on houses, flats and commercial buildings across the borough. The old bead always comes out completely before anything new goes on. If yours keeps going black within months, our guide to why sealant goes mouldy explains what is happening underneath.
Neighbourhood by neighbourhood since 1951
The New Town was planned as self-contained neighbourhoods. The Stoney Hall and Monks Wood estates were lived in first, in 1951, followed by Bedwell in 1952 and Broadwater and Shephall in 1953, then Chells, Pin Green, Symonds Green and later areas such as Chells Manor and Poplars. Affordable terraced housing in Shephall, Broadwater, Chells and St Nicholas drew many families out of London in the 1950s and 1960s. Great Ashby, to the north-east, is a newer development that actually sits in North Hertfordshire district.
Those early terraces were built in volume and to a budget. Over seventy years, bathrooms have been replaced, walls re-tiled and baths swapped for showers, and each refit has left its own sealant behind. We regularly find two or three layers in one joint. Many homes also had their original windows replaced with uPVC in the 1980s and 1990s, and that mastic has now hardened and pulled away from the brick.
The Old Town is different. Its High Street, on the old Great North Road, has been a conservation area since 1969, with coaching-inn buildings and the Grade II listed Cromwell Hotel. Older timber frames there need a sealant that suits the joinery, and sometimes one that can be painted. In the newest homes at Great Ashby and on recent schemes, builder sealant failing in the first year or two is the usual call-out.
Maisonettes, low-rise blocks and a town centre filling with flats
A lot of Stevenage housing is stacked: maisonettes above flats, three- and four-storey blocks and flats over neighbourhood shopping parades. In those buildings a failed seal on a bath or shower tray tends to show up next door or downstairs, so it pays to reseal at the first sign of cracking. We can arrange access through the council, a housing association or a managing agent.
The town centre, which opened in 1959 as Britain’s first purpose-built pedestrian shopping precinct, is now part of a long regeneration programme, including the SG1 scheme, with more town-centre living and some commercial space being turned into flats. New flats bring new snagging, and our guide to new build sealant snagging lists what to look for before the developer’s warranty window closes.
Gunnels Wood, the science park and Lister Hospital
The development corporation zoned land between the East Coast railway and the A1 for industry, and it became the Gunnels Wood Industrial Area. Today large employers there include GSK, which runs one of its two global research hubs in Stevenage, and Airbus Defence and Space, with the Stevenage BioScience Catalyst science park beside GSK and the Pin Green Industrial Estate to the north-east. Labs, offices and workshops all have washrooms and kitchens that need resealing to a hygienic standard.
Lister Hospital on Coreys Mill Lane brings demand for nearby rented rooms and care settings, where anti-bacterial products and quick turnarounds matter. See our healthcare sealant page for how we approach that work.
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.
- Neat new sealant. Each joint gets the sealant that suits it, laid and smoothed to a tidy finish.
- Cure and guarantee. We tell you when it can be used, and every job has our one-year guarantee.
Our services in Stevenage
- Bathroom & kitchen resealing: Bathroom and kitchen joints taken back to a clean, dry surface and finished with fresh anti-fungal silicone that won’t lift.
- 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: Hotels, offices, washrooms and welfare areas resealed room by room, with out-of-hours working possible to arrange.
- 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: Brickwork movement joints, render and cladding joints resealed with backing rod and flexible exterior sealant.
- New-build mastic & snagging: Snagging sealant for new homes and plot-by-plot mastic for builders and developers.
- Floor & skirting joints: Skirting-to-floor gaps, tiled floor movement joints and concrete floor joints sealed with the right product.
- Regrouting: Shower and splashback grout replaced where it has cracked or stained, with silicone in the movement joints.
- Glazing & conservatory sealant: Glass-to-frame joints on conservatories, rooflights and shower screens cut out and resealed.
- Gutter, fascia & soffit sealing: Gutter unions, outlets and fascia joints that leak in heavy rain cleaned and resealed.
- Sand mastic for sash & case windows: Old sand mastic around sash windows and doors raked out and renewed with traditional burnt sand mastic.
Why Mr Mastic in Stevenage
Stevenage is a straight run up the A1(M) for us, and we treat every home here as we would one in Crawley. We bring 20+ years in the trade, full insurance and ARBOMaster approved applicator status, and we work with Arbo and Everbuild sealants. More than 2,847 projects are behind us, along with a 4.9-star Google rating from 180+ five-star reviews. You will have a clear quote before we pick up a knife, and each job is covered by a one-year guarantee.
Landmarks near Stevenage
For trains, Stevenage station is closest to the centre. Well-known places nearby include Stevenage Museum (0.8 miles south-west) and Benington Castle (2.9 miles east). Around the centre, our work takes us to homes, rentals and businesses close to Saint Vincent de Paul Catholic Primary School, Marriotts School, The Heathcote School and St Hugh & St John. For open space, Pryor's Wood is close by.
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.”
Neighbourhoods we cover in Stevenage
Select your area for more local detail, or call 07833 053749 or email us with your postcode.
Other towns around Stevenage
Questions we’re asked in Stevenage
Do you cover all of Stevenage?
Yes, every neighbourhood, including Bedwell, Broadwater, Shephall, Chells, Chells Manor, Pin Green, Symonds Green, St Nicholas, Poplars, the Old Town and Great Ashby.
My 1950s terrace has three layers of old sealant round the bath. Can you remove it all?
Yes. We cut and scrape out every layer back to clean tile and bath, treat any mould, then lay one new bead.
I live in a maisonette. Will my reseal stop the leak into the flat below?
If the cause is failed sealant around the bath or shower, yes. If a pipe or waste is leaking, that needs a plumber first, and we will tell you if we suspect it.
Can you seal around timber windows in the Old Town?
Yes. For older joinery we use a sealant suited to timber and can use a paintable product where the frame is painted.
The builder’s sealant in my Great Ashby home has split. Is that common?
Very. New houses settle, and the first bead is often too thin. We remove it and reseal properly.
Do you work in offices and labs at Gunnels Wood?
Yes. We can work out of hours and use anti-bacterial sanitary silicone where hygiene matters.
Do you reseal for landlords with homes near Lister Hospital?
Yes. We often reseal between tenancies so rooms can be relet quickly.