Hampshire · England
Mastic man in Alton
Resealing, window mastic and sealant repairs for Alton’s town-centre buildings, brewery-era streets, flats and family homes across East Hampshire.
- 20+ years’ experience
- ARBOMaster approved applicator
- One-year guarantee
Your local mastic man for Alton
Alton is a market town in East Hampshire, near the source of the northern branch of the River Wey, and had 17,880 residents at the 2021 Census. Its homes range from very old buildings in the centre to post-war semis and new apartment blocks, so the sealant jobs here are rarely all the same. Mr Mastic covers Alton from our base in Crawley, along with the villages around it.
We reseal baths, showers, sinks and worktops, replace cracked mastic around windows and doors, and seal external joints where brick, render and frames meet. Where you want the new sealant to blend in with tiles, stone or a coloured worktop, we can match it; our colour-matched resealing page shows how. Whatever the job, the old sealant is removed in full first.
Market Square, old brewery streets and new apartments
The centre has the town’s oldest buildings, from the Town Hall in Market Square to the Church of St Lawrence and a well-preserved Tudor cottage at 1 Amery Street. Brewing shaped much of the town: large brewery operations were set up in Turk Street in the 1800s, and the Alton Maltings, said to be the widest wooden-spanned building in Hampshire, was renovated in 2004 and 2005. Old buildings like these move, and their walls and window openings are rarely square, so joints need a sealant that will stay flexible.
Beyond the centre, a large share of Alton’s housing is family homes, and around 29.3% of households live in a semi-detached house. Many have been refitted more than once, and we often find shrunken sealant behind worktops, gaps under baths that have dropped, and uPVC windows whose mastic has hardened and split.
Flats are a big part of the mix too. About 27.1% of households live in a flat, maisonette or apartment, and newer schemes such as the housing and apartment blocks at Goswell Square, on the former Municipal Ground, add to that number. In a flat, a failed shower seal usually shows itself on the ceiling below before you notice it at home.

Period frames in the centre, flats on the edges
Where original timber windows survive in the older parts of town, the joint between frame and wall often needs a traditional approach. Sash windows were sealed with sand and lime-based mastic for generations, and that is still the right answer for some frames; our guide to sand mastic for sash windows explains when. On listed buildings, it is worth checking what is allowed before any change to windows or their surrounds.
In apartment blocks, access is the main thing to plan. We can work with your managing agent on keys, parking and timings, and carry everything up ourselves. Bathrooms in flats often have showers over baths on suspended floors, so we seal with the bath filled, using a flexible sanitary silicone that copes with the movement.
Industrial estates, colleges and landlords
Alton has four industrial areas, at Mill Lane, Newman Lane, Caker Stream and Omega Park, plus offices at Lumbry Park on the Selborne road. Staff kitchens, toilets and shower rooms on sites like these wear their sealant hard, and our commercial sealant service is set up for that kind of work, with out-of-hours working available.
The town also has Alton College, Amery Hill School and, in Holybourne, Treloar School and College, as well as a large rental market. We reseal for landlords and letting agents between tenancies and after mould reports, and can quote for several properties together.
From first call to finished joint
- Call or email. Tell us what needs doing, where it is and anything about access. Photos by email help.
- Quote and booking. We quote clearly before anything starts and fix a day that works for you.
- Strip back the old joint. Every bit of old sealant is removed and the joint is cleaned, treated for mould and dried.
- Seal and finish. The right sealant for each joint is applied and tooled to a neat, even finish.
- Leave it to cure. We tell you how long to leave it before use, and the work carries our one-year guarantee.
Our services in Alton
- 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: Window and door mastic that has dried out in the sun replaced with a weather-resistant joint that can move with the frame.
- Commercial & hotel sealant: Sealant programmes for offices, hotels, care settings and schools, with early or late working where it helps.
- Remedial sealant & repairs: Failed, botched or over-sealed joints stripped out, the cause found and the joint resealed properly.
- Fire-rated sealant: Fire-rated sealant for service penetrations and frame gaps where it has been specified, applied to the tested details.
- 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: New-build bathrooms, kitchens and frames resealed where the original sealant has cracked as the house settles.
- 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: Glass-to-frame joints on conservatories, rooflights and shower screens cut out and resealed.
- 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 burnt sand mastic renewed around sash and case windows and doors in stone and brick.
Choosing a mastic man in Alton
Old timber, new apartments and everything in between: Alton’s homes need a careful hand. Our applicators bring 20+ years of sealant work, full insurance and ARBOMaster approved applicator status, and we use Arbo and Everbuild products throughout. With 2,847+ completed projects and a 4.9-star Google rating from more than 180 five-star reviews, we know what lasts. You agree a clear quote before we start, and the work is covered by a one-year guarantee.
Getting around Alton
For trains, Alton station is closest to the centre. Places most people will know nearby are Allen Gallery (less than half a mile east). Around the centre, our work takes us to homes, rentals and businesses close to Saint Lawrence Church of England Primary School, Amery Hill School, Treloar School and Church of St Lawrence. For open space, Holybourne Hill is 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.”
Where we work in Alton
Choose your part of town for local details, or call 07833 053749 or email us and tell us your postcode.
Towns near Alton
Questions from Alton
Do you cover all of Alton?
Yes. We cover the whole town, including Holybourne and the town centre, and nearby Chawton, Four Marks, Selborne, Ropley and Bentley.
Can you match the sealant colour to my worktop?
Yes. We can colour-match sealant to many worktops, tiles and stone so the joint blends in.
I live in a flat near Goswell Square. Can you reseal my shower?
Yes. We’ll arrange access with your managing agent if needed and reseal the tray, screen and wall joints in one visit.
My cottage has old timber sash windows. Do you use silicone on them?
Not always. Some sash frames are better suited to traditional sand mastic or a paintable sealant, and we’ll explain the options before we start.
Can you work on an industrial estate before staff arrive?
Yes. Out-of-hours working can be arranged for commercial jobs.
Why has the sealant behind my kitchen worktop come away?
Worktops and walls move a little, and older sealant shrinks and hardens until it can’t follow them. We cut it out and use a fresh, flexible bead.
Do you give a quote first?
Yes. You get a clear quote before any work begins.
