Southampton · England
New-build mastic & snagging in Freemantle, Southampton
Plot mastic for developers and snagging failed sealant in new homes for Freemantle, backed by a one-year guarantee. Call for a quick quote.
- Worktop and upstand sealant coming away
- Leaking shower tray seals in a new home
- Messy sealant that spoils new finishes
New build mastic in Freemantle
Some owners wait for the first year’s movement before having joints redone. That makes sense for small gaps that are just cosmetic, but a seal that’s letting water through needs doing now. Typical jobs include skirting joints opening in the first winter and plot mastic for developers ahead of handover, on kitchens, show homes and skirting & floors.
In smaller places like Freemantle, new homes tend to come as small developments or single plots. The sealant around baths, showers, frames and skirtings needs to be right from the start.
There’s a 12-month guarantee on every job, large or small.
- Place
- Freemantle (SO15, SO16, SO17)
- Region
- Southampton
- Cover
- One year on every job
- Price
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Looking after it afterwards
Aftercare is simple, and it makes a real difference:
- Do not wait for the house to settle if water is getting through
- Look at the sealant regularly in the first couple of years
- Put sealant faults on your snagging list early
- Follow the cure time we give you
Keep pictures of the joints and any snagging correspondence with your builder. It helps if anything else comes up during the warranty period.
The sooner you deal with untidy or cracking sealant, the less there is to put right. Left alone, a small crack can become a leak.
Signs you need new build mastic in Freemantle
Sealant applied onto damp surfaces does not bond well. On a busy site, joints aren’t always given time to dry.
The most common problems we see are:
- Messy sealant that spoils new finishes
- Cracks appearing as a new home settles
- Cracked sealant around new window and door frames
- Skirting joints opening in the first winter
Around Freemantle, as everywhere, new build mastic is only as good as the preparation behind it.
Questions to ask before you book
- Whether they’re fully insured
- What preparation is included
- Whether all the old sealant comes out first
- What guarantee comes with the work
Different surfaces, different methods
Bathrooms and en suites
New-build bathrooms and en suites are where sealant fails most often. The old sealant comes out and anti-fungal sanitary silicone goes in after cleaning and priming.
Skirting and floors
Gaps under skirting are one of the most common new-build snags. A flexible sealant closes it without cracking like caulk.
For landlords and businesses
If you manage several properties in or around Freemantle, several properties can be quoted together. Just tell us the addresses and what each one needs, and photos by email help.
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Also near Freemantle
Also in Freemantle
Your questions about new build mastic in Freemantle
Can you help a landlord with a rental near Millbrook (Hants) station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Will you come out to Freemantle?
Yes, Freemantle is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you take out the old sealant first?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
What do you put in the joint?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Is the work guaranteed?
Yes, for a year. If there’s a problem with our work in that time, tell us and we will put it right.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Why does sealant fail so quickly in new builds?
New homes dry out and move in their first couple of years, and sealant is often rushed onto dusty, unprimed surfaces. Either can make it fail early.
Where do you work from?
Mr Mastic is based in Crawley. We cover Freemantle and the rest of Southampton.
Should I try it myself first?
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
What we cannot put right
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Cracking that points to a structural problem
- Broken tiles or a split tray
- Baths and trays that move too much for sealant to cope with
If in doubt, call 0345 464 0079 or email us and we’ll say what we think.
Joints and surfaces we work on
- Show homes
- Plot handovers
- Kitchens
- Bathrooms & en suites
- Windows & doors
- Skirting & floors
Joints and finishes in Freemantle homes
Freemantle is within about 1 mile of the coast. Plot mastic on new homes near the coast takes more weather than it would inland, so any gaps are best picked up early. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For new homes near Millbrook (Hants) station, it’s worth checking the sealant early, while snags are still fresh.
Freemantle is about 1 mile west of Southampton, in Southampton. From the centre of Freemantle to the outskirts, new build mastic is available for homes and businesses alike. We cover 40 towns and villages across Southampton.
Work in SO15, SO16 and SO17 works the same way as everywhere else we cover. New build mastic is available to properties on May Road, Park Road and Pitt Road. Freemantle is on the A33, so it’s easy for us to get to with everything needed for new build mastic. Nearby, we also carry out new build mastic in Shirley (1 mile north), Regents Park (1 mile north-west), Millbrook (1 mile west), Maybush (2 miles north-west) and Coxford (2 miles north-west). We also work in nearby towns such as Townhill Park (3 miles north-east), Midanbury (3 miles east), Thornhill (4 miles east), Chartwell Green (4 miles east), Harefield (4 miles east) and Itchen (3 miles east).
What’s near Freemantle
Typical jobs here are in homes near St Anne's Catholic School, Blechynden Terrace Park and The Brass Monkey pub, among other places. Freemantle has its own railway station: Millbrook (Hants) station. Well-known places in the area include Western Community Hospital (1.3 miles north-west) and Foresters Museum & Archive (under half a mile east). For a walk, there’s Testwood Lakes.
What happens on the day
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it usually takes anything from a few hours to several days, depending on the number of plots. For a job in Freemantle, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- Each joint is checked for movement before we start.
- Old sealant is cut out and the joints cleaned.
- Joints are dried and primed where the product calls for it.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- We check every joint and leave you with the cure times.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- On commercial sites, let us know about site rules
- Where the joints are inside, avoid wetting them before we arrive
Get a quote
Every job is quoted individually. Simply ring 0345 464 0079 or email us and describe the job, and pictures are welcome.