Portsmouth · England
New-build mastic & snagging in Portsea, Portsmouth
Problem with your new-build sealant joints in Portsea? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Sealant that never bonded to the surface
- Second-fix sealing on new plots
- Shower seals failing in the first year or two
How to look after the new joints
To keep the joints looking good and working properly:
- Get a leaking seal dealt with right away
- Clean sealant with mild detergent, not abrasives
- Resist patching a failed seal with a tube from the DIY shop
- Keep photos and emails about snagging items
Watch the joints as the house settles. Hairline gaps can open as timber and plaster dry, and they’re simple to reseal once movement has slowed.
Report failed sealant to the builder while you are in the snagging period. After that, putting it right may fall to you.
How we handle new build mastic in Portsea
We never seal over a failed new-build bead. New silicone will not bond to old silicone, so the joint is cut out, cleaned, dried and resealed. If you’re dealing with smeared, uneven beads picked up at snagging and gaps between new skirting and floors, we can put it right, on skirting & floors, plot handovers and windows & doors alike.
If you’ve bought a new home in or near Portsea, the first year or two is a good time to check the sealant. Gaps at skirtings, shower seals pulling away and missing mastic around frames are common snags.
You are covered for a year from the day we finish. If there’s a problem with it, please ring 0345 464 0079 or email us.
- Location
- Portsea (PO1, PO12, PO5)
- Region
- Portsmouth
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Common questions in Portsea
Is Portsea within the area you cover?
Yes, Portsea is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you cover Portsea for new build mastic?
Yes. We work across London and the South East, and Portsea is part of that. Just call 0345 464 0079 or send us an email with a few details of the job.
Is it messy?
Very little: the area around the joints is protected first, and we tidy up before we go.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We will tell you what we’re using and why.
Do you work for developers?
Yes. We work through plots to your schedule, room by room. Tell us the plots and the joints involved and we will quote.
Do you work through snagging lists?
Yes. Photos of each sealant item help us quote. Items that need a plumber, tiler or the builder are flagged.
How long does the job take?
A typical job takes a few hours in a single home. Your quote will say how long we expect yours to take.
What does new build mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote.
Landlords, agents and businesses in Portsea
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
What sealant work can’t fix
Sealant isn’t the answer to every problem, and we’d rather say so up front. It will not solve:
- Plumbing faults behind the sealant
- Settlement cracks that need a surveyor
- Damaged fittings that need replacing
If you’re not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer.
Joints and surfaces we work on
- Kitchens
- Bathrooms & en suites
- Skirting & floors
- Plot handovers
- Windows & doors
- Show homes
Leave it or put it right?
A failed shower or bath seal in a new home lets water into floors and walls that are still drying out. Dealing with it early keeps the damage away from ceilings, floors and finishes. Around Portsea, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
We don’t show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
Why book with us
- Every job guaranteed for a year
- Fully insured
- Homes, businesses and hotels
- Trusted Arbo and Everbuild sealants
Take a look at how sealant jobs are priced or customer reviews.
How it works
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours for most snagging lists, longer for a run of plots, and the area is left clean. A visit to Portsea is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- 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.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- The finished joints are checked and the cure times given.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Clear the area around the work
- Mention if the joints have been sealed before
How to get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that is easy.
Related advice
Towns and villages near Portsea
Also in Portsea
What new build mastic looks like in Portsea
Portsea is within about 1 mile of the coast. New homes near the sea put their outside mastic to work from day one, so it’s worth checking at snagging. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Around Portsea, as everywhere, new build mastic is only as good as the preparation behind it.
Portsea is about 1 mile south-west of Portsmouth, in Portsmouth. Our applicators cover new build mastic for homes and businesses in Portsea, as part of our work across Portsmouth. Our area takes in 19 places across Portsmouth, from the larger towns to small villages.
Jobs for new build mastic in PO1, PO12 and PO5 works the same way as everywhere else we cover. Streets in the area include Main Road, Park Road and Scott Road, all of which we cover. We also cover the places around Portsea: Portsmouth Point (1 mile south), Clayhall (2 miles south-west), Haslar (2 miles south-west), Alverstoke (2 miles south-west) and Privett (2 miles west). Within a short drive, we also cover Hilsea (3 miles north-east), Wymering (4 miles north-east), Paulsgrove (4 miles north), Cosham (3 miles north-east), Drayton (4 miles north-east) and Farlington (5 miles north-east).
What’s near Portsea
Typical jobs here are in homes near The Ship & Castle pub, St Jude's CofE Primary School and Charter Academy, among other places. Portsea has its own railway station: Portsmouth Harbour station. Other landmarks nearby include Royal Portsmouth Hospital (0.8 miles east) and Genesis Expo Creationist Museum (within half a mile south). For a walk, there’s Milton Locks and Portsdown Hill.
Common problems we fix in Portsea
If plaster or screed was still damp when it was sealed, the bond suffers. On a busy site, joints aren’t always given time to dry.
Common reasons people contact us are:
- Second-fix sealing on new plots
- Internal frame sealant that has split
- Beads laid onto grit and dust from the build
- Messy sealant that spoils new finishes
For new homes near Portsmouth Harbour station, it’s worth checking the sealant early, while snags are still fresh.
Questions to ask before booking
- What happens if they find a problem under the old sealant
- Whether all the old sealant comes out first
- What the cure time is
- What guarantee comes with the work
Quotes for new build mastic in Portsea
Call for a quick quote. The main things that affect it are:
- The old material and how stubborn it is
- Mould in or behind the old joints
- Any working-time requirements on site
- The size of the job
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs. Ask us for a quote and we will explain what it covers.
What to tell us for a quote
Photos by email are helpful but not essential. Try to tell us:
- Any access issues, like height or stairs
- If it’s domestic, commercial or a hotel
- Any previous sealing or DIY work
- Pictures of the joints, sent by email
We quote each job on its own, so the first step is telling us about yours. Simply call 0345 464 0079 or send us an email and describe the job and send photos if you have them.