Hampshire · England
New-build mastic & snagging in Andover, Hampshire
Plot mastic for developers and snagging failed sealant in new homes in Andover, with a one-year guarantee on every job. Ask us for a quote.
- Internal frame sealant that has split
- Shower seals failing in the first year or two
- Kitchen sealant that has pulled off the wall
About our new build mastic in Andover
New homes move as they dry out. Timber dries and shrinks, and baths and trays settle, so sealant that was laid quickly before handover often cracks. We work on windows & doors, kitchens and skirting & floors, and the jobs we see most are cracked caulk along new skirting and cracks appearing as a new home settles.
Homes around Andover move a little with the seasons, and skirting and floor joints show it first. Those joints need a flexible sealant, as rigid filler soon cracks out.
Whatever the size of the job, you get the same 12-month guarantee in Andover and across Hampshire.
- Location
- Andover (SP10, SP11)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How the visit works
All our tools and materials come with us in the van. After a quick look at the joints together, we protect the area and start. Most jobs take anything from a few hours to several days, depending on the number of plots. Parking in a town like Andover is normally straightforward, but tell us if there’s a driveway or any restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- Each joint is checked for movement before any work starts.
- We remove the failed sealant and clean the joints.
- We make sure the joints are dry and prime them if needed.
- Baths are filled with water, then the new sealant is applied.
- The finished joints are checked and the cure times given.
How to prepare
- On commercial sites, let us know about site rules
- Plan for the work area to be out of bounds to pets and children
- Tell us about any water getting in
Getting a quote
Want a quote for new build mastic? Please call 0345 464 0079 or send us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
New build mastic in Andover: local notes
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In and around Andover, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Andover is about 17 miles west of Basingstoke, in Hampshire. Jobs in Andover get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 683 places across Hampshire. For nearby work, see our Southampton page.
Jobs for new build mastic in SP10 and SP11 works the same way as everywhere else we cover. If you need new build mastic at a property on High Street, Goddard Square and London Road or a nearby road, our applicators can take on the job. With the A303 and A342 close by, Andover is easy for our applicators to reach for new build mastic. Other places close to Andover include Picket Twenty (1 mile east), East Anton (1 mile north-east), Knights Enham (1 mile north), Finkley Down (2 miles north-east) and Picket Piece (2 miles east). Further out, we also cover Winchester (13 miles south-east), Romsey (15 miles south), Hyde (12 miles south-east), Tidworth (8 miles west), Weeke (12 miles south-east) and Kempshott (15 miles east). Being one of Hampshire’s larger places, Andover has homes, rented property and businesses of every kind.
What’s near Andover
Around Andover, our work takes us to homes and buildings near The Angel Inn, Winton Community Academy and Winton Community Academy. The closest station to Andover is Andover station, about 0.5 miles west. Other landmarks nearby include Andover War Memorial Hospital (0.7 miles north-west) and Andover Museum (under half a mile east). Green spaces nearby include Anton Lakes and Mill Lake.
When to call us in Andover
Once people move in, baths and trays take weight and bed down. If a bath wasn’t filled when it was sealed, the bead is stretched the first time it’s used.
The problems people generally mention when they call are:
- Cracked sealant around new window and door frames
- Beads laid onto grit and dust from the build
- Plot mastic for developers ahead of handover
- Shower seals failing in the first year or two
For new homes near Andover station, it’s worth checking the sealant early, while snags are still fresh.
Before booking anyone
- How the joint is cleaned and prepared
- Who turns up on the day
- What product goes in the joint
- Whether VAT is included
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Surface by surface
Plot handovers
Developers can send the plot schedule and specification for a quote. Sealant work across the plot is covered as agreed.
Show homes
Tired or marked sealant in a show home can be renewed. We cut it out and reseal neatly.
Why deal with it now?
A hairline gap at a skirting can wait, but water getting through cannot. If you are unsure which you have, call 0345 464 0079 or send us an email with photos. Black mould and gaps in sealant do not fix themselves, and in a busy household in Andover they spread with every shower and every downpour. Now is the easy time to put it right.
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You’ll have a clear quote before any work starts.
Why book with us
- Every job guaranteed for a year
- We leave the area clean and tidy
- We never seal over old sealant
- Quality sealants from Arbo and Everbuild
Read what affects the cost or what customers say.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Get a leaking seal dealt with straight away
- Use the extractor fan every time you shower
- Resist patching a failed seal with a tube from the DIY shop
- Wipe joints with warm soapy water
Leave the sealant for the cure time we give you before showering or bathing. Silicone is usually left for about a day to cure enough for use.
Lifting sealant traps moisture and mould behind it. Dealing with it before it goes black keeps the job straightforward.
Also near Andover
What else we do in Andover
Questions from Andover
Do you cover Andover for new build mastic?
Yes. We work across London and the South East, and Andover is part of that. You can call 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear price.
What guarantee comes with new build mastic in Andover?
All our work, in Andover and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Can new sealant go on top of the old bead?
No. New silicone won’t bond to old silicone, so sealing over the top fails quickly. The old sealant always comes out first.
Who should fix failed sealant in a new build?
While the snagging or warranty period runs, the builder should be your first contact. If they’re slow or the fix doesn’t last, we can help.
Is it normal for sealant to crack in a new home?
It’s common, and there are generally two reasons: the house moving as it dries, and sealant that never bonded properly. A proper reseal deals with both.
Is it worth trying it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
How long does new build mastic take?
It depends on the size of the job, but most jobs take a few hours for most snagging lists, longer for a run of plots. We will give you a better idea when we quote.
Do you have insurance?
Yes. We are fully insured.
What we cannot put right
To be straight with you, some problems need a different trade:
- Plumbing faults behind the sealant
- Structural cracks in walls or ceilings
- Baths and trays that move too much for sealant to cope with
If you are not sure, just phone 0345 464 0079 or send us an email and we will give you a straight answer.
Joints and surfaces we work on
- Kitchens
- Plot handovers
- Show homes
- Windows & doors
- Bathrooms & en suites
- Skirting & floors