Construction and new-build mastic in Alton, Hampshire
Mastic packages for new-build and refurbishment projects in Alton and across Hampshire. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.
- Cracks opening in caulked internal joints
- Snag items on joints that need redoing before handover
- Failed sealant in an existing building being refurbished
Construction mastic for Alton sites
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
About our construction mastic in Alton
External mastic depends on the weather in a way most internal trades don’t. Cold or damp mornings, frost and condensation on frames can all hold external sealing up. Internal sealing often fills those days. If you are dealing with old sealant on a refurbishment that needs stripping before new work and external joints sealed in damp or cold conditions that are now failing, we can put it right, on cladding and panel joints, window and door perimeters and internal decorators’ caulk alike. Whether you call it commercial sealant work, mastic application or joint sealing, the work in Alton is the same: the right product in a properly prepared joint.
Many towns of Alton’s size have older buildings being converted or extended, so new windows and cladding meet old masonry. Getting the product and primer right for both faces is what keeps those joints sound.
Guaranteed is the last step of every job. You get a 12-month guarantee on our workmanship, and we explain exactly what that covers when we quote.
- Where
- Alton (GU34)
- Wider area
- Hampshire
- Guarantee
- 12 months on our workmanship
- Price
- Quoted before any work starts
- Phone
- 01277 525 020
- Last updated
- 3 November 2026
Doing it in-house
Some joints are best left to specialists: fire-rated seals that must follow a tested detail, trafficked floor joints and external movement joints among them. Getting these wrong normally costs more in the end than doing them right.
For a quick touch-up, site staff may be fine, but anything bigger is another matter: a specialist brings efficiency, a consistent finish and a 12-month guarantee.
When something else is needed
We seal joints; we don’t mend everything behind them. On its own, sealant can’t deal with:
- Designing joint widths or choosing the specification (that sits with the designer)
- Approving fire stopping as compliant
- Joints damaged after sign-off by following trades
If you’re not sure, just call the office on 01277 525 020 or use the quote form and we will give you a straight answer before you book.
Surfaces we seal
- Brick and block movement joints
- Cladding and panel joints
- Floor and skirting junctions
- Sanitary and kitchen joints
- Window and door perimeters
- Internal decorators’ caulk
For managing agents and facilities managers
If you look after buildings for someone else, clear figures and clear communication matter. We quote a fixed sum, confirm the scope and walk the finished work with you or your representative, plus a 12-month guarantee.
Agents, factors and owners’ representatives all follow the same route: send the details, accept a fixed quote, and we carry out and guarantee the work. We can agree access arrangements and keyholder contacts beforehand.
Towns and villages near Alton
Other services in Alton
Questions about Alton
Will you take on work at estates like Kerridge Industrial Estate, close to Alton?
Yes. We cover Alton and the area around it, including industrial estates, business parks and retail parks such as Kerridge Industrial Estate. Send details of the unit and the work through our quote form for a quick quote.
Can you work to our programme on a site in or near Alton?
Yes. Send the programme and drawings, and we’ll plan the mastic to suit the stages. We’re CHAS accredited and a Constructionline member, and paperwork such as RAMS is confirmed with the quote.
Do you install fire-rated sealant as part of a package?
It can be part of the package where specified. Tell us what records you need and we’ll confirm with the quote.
Will you just go over the old sealant?
No. We cut the old material out and clean the joint back before sealing, since fresh sealant will not bond reliably to aged material.
Can you come in just for snagging?
Yes. Damaged, missed or untidy joints are stripped and done again properly, working to your handover date.
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.
What does a mastic package typically include?
Window and door perimeters, internal decorators’ caulk where specified, sanitary joints, kitchens, movement joints and snagging. We price to the specification and drawings.
Aftercare for building managers
Keep the joints in good shape with a few simple steps:
- Record the products used in the O&M file
- Stick to the specified sealant rather than a generic substitute
- Protect sealed areas from following trades
- Don’t schedule sealing before decorators and flooring are done
Once an area is sealed, protect it from following trades. Fresh sealant needs its cure time before it’s cleaned, painted near or knocked; we confirm the time for each product.
Leaving the mastic snag list to the end squeezes everyone. A planned close-out through each area as it completes keeps the list short and keeps handover on track.
Our process
Diagnose, treat, sign off: that’s the shape of every visit. We inspect the joints and confirm what’s in scope, then the work is carried out to the specified product and detail, and the job ends with a walk round and sign-off. In a town such as Alton, most jobs are single buildings. Your photos, drawings or a site visit come first, followed by a fixed quote.
- We start with the drawings, specification and programme.
- We take off quantities and return a fixed quote.
- The sequence is agreed with the site manager.
- Plots or floors are sealed as they’re handed over.
- Joints are prepared, backed and sealed to the specification.
- After snagging, the work is handed over under our 12-month guarantee.
What we need from you
- Tell us which areas need to stay in use
- Make sure the joints can be reached
- Share the asbestos register for older buildings
Getting a fixed quote
Tell us about the building, the joints and when you need the work done, and a fixed quote will follow. The easiest way is to phone 01277 525 020 or email drawings and photos.
Related advice
Construction mastic around Alton: what changes locally
Alton sits in one of the drier corners of the country, the South East. Still, external mastic needs dry faces within the maker’s temperature limits, which isn’t every day, so external mastic is timed for workable conditions and agreed with the site manager. Alton is about 45 miles from central London. Towns within reach of London tend to keep building, from flats to offices and schools, which keeps mastic packages in demand.
Extensions at sites like Alton Community Hospital (to the south-west of Alton) typically sit beside working departments, and the mastic follows strict access rules. For a contractor at a hotel such as The Crown Hotel, less than half a mile east of Alton, the mastic often has to be finished before a reopening date. School extensions, at buildings such as Saint Lawrence Church of England Primary School, usually run to the summer holidays, mastic included.
Alton is about 10 miles south-east of Basingstoke, in Hampshire. If you are looking for construction mastic in Alton, we can help, as we do across Hampshire. Alton is one of 723 places in Hampshire on our list for mastic packages. Reading is covered too, some 21 miles away.
We take on mastic packages across the GU34 postcode area. Streets here include High Street, Station Road and Goswell Square. Alton sits on or close to the A339 and B3004, useful when we plan access and materials. Sites close to Alton are covered too, including 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). Bigger towns within reach 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
In Alton, that means premises near Amery Hill School, Treloar School and The 'Baker's Arms' Public House and the streets around them. Alton has its own railway station: Alton station. A little further out are Allen Gallery (less than half a mile east) and Alton Community Hospital (0.9 miles south-west). For a walk, there’s Holybourne Hill.
What sets the cost
Your fixed quote is built from the real scope. It takes account of:
- The total length or number of joints
- How accessible the joints are
- Whether the work must be split into stages
- Distance, for remote addresses
There’s no price list, because the scope varies so much from one building to the next. Call for a quote and we’ll price your job on its own details.
Before you send an enquiry
A few photographs plus some basic facts will normally do. Please tell us:
- What the building is and how it’s used
- Any dates the work must fit around
- Drawings or a marked-up plan, if available
- Whether an asbestos survey exists
Send details, get a quote, we seal, guaranteed: that’s how every job runs. To take the first step, speak to us on 01277 525 020 or use the quote form.