Southampton · England
New Build Mastic in Portswood
Our applicators work in Portswood on plot mastic for developers and snagging failed sealant in new homes. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Sealant work across a run of new homes
- Kitchen sealant that has pulled off the wall
- Sealant applied over dusty or wet surfaces
When to call us in Portswood
New homes are full of moisture from plaster, screed and concrete, and it dries out over the first couple of years. As it does, timber shrinks and joints open and the sealant has to cope with the movement.
Any of these means the joints need attention:
- Cracks appearing as a new home settles
- Leaking shower tray seals in a new home
- Plot mastic for developers ahead of handover
- Cracked caulk along new skirting
For new homes near St Denys station, it’s worth checking the sealant early, while snags are still fresh.
What to look for in a quote
- Whether all the old sealant comes out first
- What product goes in the joint
- How the surfaces are prepared before sealing
- What guarantee comes with the work
How we handle new build mastic in Portswood
A new build should have a neat, sound bead at every joint. When the finish is smeared, patchy or already cracking, it’s worth putting right early, before water gets into the floor or walls. Common call-outs are for sealant work across a run of new homes and skirting joints opening in the first winter, across windows & doors, kitchens and plot handovers.
Homes around Portswood range from older cottages to newer houses, and their floors range just as widely, each moving in its own way. Skirting and threshold joints need a sealant that suits the floor.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Place
- Portswood (SO17, SO14, SO18)
- Wider area
- Southampton
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Places near Portswood
Other services in Portswood
Landlord and commercial work in Portswood
Housing providers, facilities teams and property managers book us too in Portswood and across Southampton. Several sites can go on one quote, and we are fully insured for the work.
Landlords and letting agents in Portswood can book us as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.
What affects the cost of new build mastic
The quote reflects the job in front of us. We take into account:
- When we can work, for business premises
- The old material and how stubborn it is
- The number of rooms or windows
- The product the joint needs
What you pay reflects the work, not a rough estimate. That is why we ask about the job first.
Asking for a quote
What to tell us when you ask for a quote:
- Any previous sealing or DIY work
- Where the property is
- If it’s domestic, commercial or a hotel
- The problem you’ve noticed
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work.
Looking after it afterwards
Joint life depends on how it’s used and looked after. We suggest:
- Don’t wait for the house to settle if water is getting through
- Check bath and shower seals every few months as the house settles
- Photograph failed sealant before it’s redone
- Keep water off fresh sealant until it has cured
Avoid standing on the rim of the bath or the edge of the tray. If a bath or tray moves when you stand in it, get it looked at.
Leave a failed new-build seal and water can reach the floor and the ceiling below. Catching it early keeps the fix to the sealant.
How the visit works
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The job generally takes a few hours for most snagging lists, longer for a run of plots, including the tidy-up. Parking around Portswood is normally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- First, the list of joints is agreed from your snagging sheet or plot schedule.
- Every bit of the old builder’s sealant is cut out, with no layer left behind.
- We clean out the dust and grit left from the build.
- Primer goes on where the surface and product need it, then the new sealant.
- Each bead is tooled and the cure times explained.
Getting ready for the visit
- Keep children and pets away from the work area
- Mention any leaks or damp you’ve noticed
- For business premises, tell us about site rules or sign-in
Get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
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What the job involves on each surface
Plot handovers
Taking time over preparation reduces return visits. Dust from the build is removed first and prime where the product needs it.
Kitchens
Worktop, upstand and sink joints in new kitchens often get a hurried bead. We remove it and reseal with a kitchen-suitable sealant.
Can I do it myself?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
Portswood questions
Can you do new build mastic in Portswood?
Yes. We work across London and the South East, and Portswood is part of that. You can phone 0345 464 0079 or send us an email and let us know what needs doing.
Will you come out to Portswood?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Can new sealant go on top of the old bead?
No. Fresh silicone doesn’t stick to the old layer, so it soon lifts and traps water. We cut the old bead out completely.
Can tenants book the work?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
How long should I leave it?
That depends on the sealant used, so follow the cure time we give you.
Is it worth resealing while the house is still settling?
That depends on the joint. Failed seals in wet areas need doing now, but cosmetic gaps can wait for movement to slow.
New build mastic in Portswood: local notes
Portswood is within about 2 miles 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 Portswood, as everywhere, new build mastic is only as good as the preparation behind it.
Portswood is about 1 mile north of Southampton, in Southampton. Homes, rented property, offices and hotels in Portswood is covered for new build mastic. The work is guaranteed for a year. Across Southampton, we cover 40 places, Portswood among them.
Work in SO17, SO14 and SO18 is quoted and booked the same way as anywhere else. That includes homes and businesses on Ivy Road, Alma Road and Lawn Road and the roads around them. Portswood sits on or near the A335 and A3035, so getting to you is simple. We also cover the places around Portswood: St Denys (1 mile south-east), Southampton (1 mile south), Inner Avenue (1 mile south-west), Bitterne Manor (1 mile south-east) and Bitterne Park (1 mile east). We also work in nearby towns such as Thornhill (3 miles south-east), Maybush (3 miles west), Eling (4 miles west), Rownhams (3 miles north-west), Millbrook (3 miles west) and Weston (3 miles south).
Near you in Portswood
Around Portswood, our work takes us to homes and buildings near St Anne's Catholic School, St Mary's Independent School and South Western Arms and the streets around them. There’s a railway station in Portswood itself: St Denys station. A little further out are Marlands Shopping Centre (1.5 miles south) and Royal South Hants Hospital (0.9 miles south). Open spaces near Portswood include Netley Common.