Hampshire · England
New-build mastic & snagging in Alverstoke, Hampshire
Plot mastic for developers and snagging failed sealant in new homes for homeowners, landlords and businesses in Alverstoke. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Gaps opening as the house dries out and settles
- Messy sealant that spoils new finishes
- Worktop and upstand sealant coming away
Joints and finishes in Alverstoke homes
Alverstoke is within about 1 mile of the coast. Plot mastic on new homes near the coast takes more weather than it would inland, so it’s worth checking at snagging. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Around Alverstoke, as everywhere, new build mastic is only as good as the preparation behind it.
Alverstoke is about 2 miles south of Gosport, in Hampshire. Alverstoke gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Across Hampshire, we cover 683 places, Alverstoke among them.
Every address in PO12 is covered for new build mastic. Whether your property is on The Lane, Fort Road and Church Road or anywhere close by, we can help. If you are just outside Alverstoke, we cover Clayhall (1 mile east), Haslar (1 mile east), Privett (1 mile north-west), Portsmouth Point (2 miles north-east) and Portsea (2 miles north-east). Larger places within reach include Havant (9 miles north-east), Fareham (5 miles north), Horndean (11 miles north-east), Hedge End (12 miles north-west), Waterlooville (9 miles north-east) and Purbrook (8 miles north-east).
What’s near Alverstoke
In Alverstoke, that means homes and buildings near Bay House School and Village Home pub. Alverstoke’s nearest station is Portsmouth Harbour station, roughly 2.1 miles north-east of the centre. Well-known places in the area include Tricorn Centre (3 miles north-east) and Gosport War Memorial Hospital (0.9 miles north). Open spaces near Alverstoke include West of the River Alver.
New build mastic for homes and businesses in Alverstoke
We work in new homes and on new-build sites across Alverstoke. One shower or a whole phase of plots, the method doesn’t change: cut out, clean, prime where needed and reseal neatly. We work on kitchens, show homes and bathrooms & en suites, and the jobs we see most are leaking shower tray seals in a new home and gaps between new skirting and floors.
In a village or hamlet like Alverstoke, new homes are more likely to be a barn conversion or a handful of houses than a big estate. Each still needs its sealant and floor joints finished properly.
Your job is guaranteed for a year, as with all our work.
- Place
- Alverstoke (PO12)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Common problems we fix in Alverstoke
Baths and trays settle under load once the home is lived in. If a bath wasn’t filled when it was sealed, the bead is stretched the first time it’s used.
The problems people usually mention when they call include:
- Frame joints opening as the plaster dries
- Second-fix sealing on new plots
- Gaps opening as the house dries out and settles
- Untidy sealant flagged on a snagging list
For new homes near Portsmouth Harbour station, it’s worth checking the sealant early, while snags are still fresh.
Comparing quotes
- How long to leave it before use
- How much experience the applicator has
- How the surfaces are prepared before sealing
- Whether you can choose the colour
Why deal with it now?
A quick bead over the top of the old sealant can look fine at first, but it will not bond to the old layer. Taking it all out and starting again is the only way to get a lasting seal. Where a wall is exposed, as many are in small places like Alverstoke, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why Alverstoke clients choose us
- You choose the colour before work begins
- A 12-month guarantee on all work
- Sealant colour chosen to suit
- Rated 4.9 stars on Google
Read how sealant jobs are priced or our reviews.
When something else is needed
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Cracked trays, tiles or worktops
- Movement caused by a poorly fitted tray or bath
- Settlement cracks that need a surveyor
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think before you book.
What we seal
- Plot handovers
- Kitchens
- Bathrooms & en suites
- Windows & doors
- Skirting & floors
- Show homes
The process
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take a few hours in a single home. In a small place like Alverstoke, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we work through your snagging list or plot schedule with you.
- The old bead comes out in full, with no layer left behind.
- Each joint is cleaned of dust and grit, then primed if required.
- We apply a sealant that suits each joint and tool it to a neat finish.
- Each area is checked and left with its cure time.
Preparing for the visit
- Mention any sign-in or site rules at work premises
- Mention if the joints have been sealed before
- Keep pets and children clear of the area while we work
Getting a quote
If you’re in Alverstoke and need new build mastic, ring 0345 464 0079 or email us. Tell us what the problem is and where, and we will agree the price before any work begins.
Related advice
Questions from Alverstoke
Do you cover Alverstoke for new build mastic?
Yes, Alverstoke is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing.
Do you cover smaller places like Alverstoke?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is it worth resealing while the house is still settling?
For failed seals that let water through, the best time is now. Cosmetic gaps can wait until the first year or two of movement has passed.
Do I need to be at home?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Do you take out the old sealant first?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
Can you do plot mastic on a new development?
Yes. We carry out plot mastic and second-fix sealing for builders and developers. Send the schedule and any specification and we’ll give you a quote.
How long before the joint can be used?
That depends on the sealant used, so follow the cure time we give you.
Do the sealants smell?
Some sealants have a smell while they cure. Ventilation helps.
Other services in Alverstoke
Surface by surface
Show homes
We can refresh show-home sealant that has discoloured or been knocked. The old bead comes out and a clean new one goes in.
Bathrooms and en suites
Shower trays in new homes often move slightly in the first year. The joint is stripped back before the new bead goes in.
Can I do it myself?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What affects the quote in Alverstoke
You’ll get a clear quote before any work starts. It’s based on:
- The number of rooms or windows
- When we can work, for business premises
- The size of the job
- The product the joint needs
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we will explain what it covers.
What to tell us for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Roughly how big the job is
- A few pictures by email, if you can
- Access, such as stairs, a lift or height
- Where the job is, and your postcode
Getting a quote is simple: let us know what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we will come back to you with a quote.