Mastic Sealing in Alton
Mastic sealing for building owners, managing agents and housing associations in Alton and across Hampshire. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.
- Draughts at frames across a block
- The same joint failures repeated across a portfolio
- Repeated reactive repairs to the same buildings
Mastic sealing near Alton
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Mastic sealing for commercial buildings in Alton
We diagnose before we prescribe: what has failed, what caused it and whether new sealant will actually solve it. Old mastic is removed entirely, the faces prepared, primer used where the maker specifies it and new sealant tooled in, with backing rod setting the depth where it’s needed. Site teams most often ask us about worn sealant at communal door frames and mastic failing across several blocks on an estate, across shopfronts below residential blocks, communal kitchens and washrooms and balcony and threshold joints. Sealant contractors, mastic applicators, sealant specialists: whatever the job title on the order, the work in Alton is the same: failed joints cut out, faces prepared and the right sealant laid to the right depth.
Housing associations in towns like Alton often run planned maintenance by estate or by block. Residents are notified through the association, and work moves building to building.
We stand behind the joints we seal with a 12-month guarantee. It covers how we prepared and applied the sealant, and we come back if anything isn’t right.
- Where
- Alton (GU34)
- Region
- Hampshire
- Cover
- 12 months on our workmanship
- Quotes
- A fixed quote before we start
- Call
- 01277 525 020
- Page updated
- 3 November 2026
FAQs: Alton
Can you quote for mastic across several buildings in and around Alton?
Yes, we quote for single buildings and for programmes across several blocks. We can phase the programme to suit your budgets and notice periods.
Will you take on work at estates like Kerridge Industrial Estate, close to Alton?
Yes. Our area takes in Alton and its surroundings, with estates and business parks such as Kerridge Industrial Estate included. A few photographs and the unit address let us price the work.
Will you just go over the old sealant?
No. Failed sealant is removed and the faces cleaned back to sound, dry material first, because fresh silicone will not bond with aged silicone.
Which sealant will you use?
Where there’s a specification, we use the product it names. Otherwise, we recommend a product to suit the joint’s movement, the substrate and the conditions, following the manufacturer’s guidance.
What about access for upper-floor joints?
Access is discussed and agreed before the quote is fixed. Tell us the number of storeys and whether scaffold or other access is planned and we will confirm the approach in the quote.
How many days will you need on site?
That varies with the scale of the job, though a typical visit normally takes a day or two for a single block, longer for an estate programme. For bigger or phased jobs, we will set out a timescale with the quote.
When can the area be used after sealing?
Curing time varies by product, and we confirm it on the day, and flag anything to keep off until it has cured.
Doing it in-house
Redoing a failed joint normally costs more than getting it right at the outset, since all of it has to come out and the faces be cleaned back again. That’s why many clients bring in a specialist from the beginning.
General builders and handymen seal joints, but it isn’t their main trade. A specialist prepares properly, controls joint depth and picks a product with the right movement class.
Common problems we fix in Alton
Topping up old mastic is a common shortcut. New silicone has nothing to grip on old silicone and the repair soon fails.
Typical triggers for a call:
- Brittle perimeter mastic across a building
- Repeated reactive repairs to the same buildings
- Old repairs sealed over failed mastic
- Open joints in brickwork or panels
If you look after a block within reach of Alton station, less than half a mile east of Alton, frame and balcony mastic can be renewed on one programme.
Before you book anyone
- Is the sealant right for the movement and the substrate?
- How they’ll work around occupants
- Whether primer will be used where the manufacturer specifies it
- Will CSCS-carded applicators be on site?
Places near Alton
What else we do in Alton
What happens if it’s left?
Open external joints let water into walls and around frames. Damp patches, stained plaster and decorating claims can follow, which is harder to deal with than resealing. In a town such as Alton, a lot of buildings are older and have been altered over time, so joints between old and new are often the first to go. Resealing them early protects the building behind.
Small jobs and large programmes are priced from the same things: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote, and you’ll have a fixed figure to work with.
Why appoint us
- Clear, fixed quotes
- One phone line for London, the South East and Scotland
- Work carried out by CSCS-carded applicators
- Workmanship guaranteed for 12 months
Take a look at our cost guide and our accreditations.
For managing agents and facilities managers
When you manage a building on behalf of an owner, clear figures and clear communication matter. We quote a fixed sum, confirm the scope and walk the finished work with you or your representative.
As a CHAS accredited contractor and Constructionline member, we are straightforward to vet for your supplier list. We’re fully insured, and our insurance certificate can go with the quote.
What sets the cost
Your fixed quote is built from the real scope. It takes account of:
- Joint width, depth and condition
- Phasing around occupants
- Induction, permit and paperwork requirements
- Which sealant the job calls for
A quote for mastic joints depends on quantities, condition and access. Call for a quote.
What we need to price the job
A good diagnosis starts with the right details. Let us know:
- Any specification or named product
- Any dates the work must fit around
- Photos of the joints, close up and from further back
- The type of building and who uses it
A good quote starts with a clear picture: what’s there, how much of it, how we reach it and what’s specified. Share whatever details you have and we will fill any gaps with a visit.
How a job runs
A typical day starts with protection: tape along each joint edge and covers over finishes, stock and equipment close by. The work itself normally takes one or more days per building, depending on the joint lengths and the access, and our waste is bagged and taken away as we go. For a town like Alton, we try to group jobs for the same client into one visit. Tell us when the building is open and we will plan to suit.
- Each block or building is walked and the failed joints recorded with the likely cause.
- You get a fixed quote, priced per building where that helps your budgeting.
- Dates, areas and access are agreed so residents or tenants can be told in advance.
- Old sealant is stripped and each face prepared back to firm material.
- Deep joints get backing rod, faces are primed if the manufacturer specifies it, then the joint is sealed and tooled.
- Completed joints are inspected and carry a 12-month workmanship guarantee.
Preparing the site
- Tell us your opening times and when work is allowed
- Tell us what induction or permit system the site runs
- Confirm the product named in the specification
Request a quote
If there’s a specification, drawings or a tender package, send it with your enquiry, and we will price the work to it. Smaller jobs need nothing more than photographs and a few notes.
Related advice
Frames, entrances and external joints in Alton
At about 45 miles from central London, Alton is within reach of the capital. Within reach of London, blocks run by agents and associations are common around stations, and window and balcony mastic on them tends to age at the same rate. Alton is in the South East, one of the UK’s drier regions. Outside mastic still needs a dry joint and the right temperature, while the elevations that take the most sun tend to show hardened mastic first.
Historic properties like Bentworth Hall (3.2 miles west of Alton) show the age of some local stock, where frame mastic must suit soft brick or stone. Landlords with units on estates such as Kerridge Industrial Estate (less than half a mile north-east of Alton) can bring frame, door and external mastic across several units into one programme.
Alton is about 10 miles south-east of Basingstoke, in Hampshire. Any commercial site in Alton is covered, for single jobs and planned programmes alike. Alton is one of 723 places in Hampshire on our list for mastic joints. For work in that direction, see our Reading page (21 miles or so).
Postcode districts covered here: GU34 for mastic joints. Among the streets we cover are High Street, Station Road and Goswell Square. Alton sits on or close to the A339 and B3004, useful when we plan access and materials. Nearby places we also cover include Chawton (1 mile south-west), Holybourne (2 miles north-east), Neatham (2 miles north-east), East Worldham (2 miles south-east) and Golden Pot (2 miles north). Nearby towns on our patch include Basingstoke (10 miles north-west), Farnborough (13 miles north-east), Fleet (10 miles north-east), Aldershot (11 miles north-east), Petersfield (10 miles south) and Yateley (14 miles north-east).
Near you in Alton
Recent enquiries here include premises near Amery Hill School, Treloar School and The 'Baker's Arms' Public House. There’s a railway station in Alton itself: Alton station. Other landmarks nearby include Allen Gallery (less than half a mile east) and Alton Community Hospital (0.9 miles south-west). Not far away are Holybourne Hill.