Portsmouth · England
New Build Mastic in Copnor
New build mastic in Copnor from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Frame joints opening as the plaster dries
- Skirting joints opening in the first winter
- Shower seals failing in the first year or two
How we quote for new build mastic
Jobs vary more than people expect. What affects the quote:
- How many rooms, windows or areas are involved
- How much old sealant there is and how hard it is to remove
- The product the joint needs
- Working hours on commercial sites
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
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:
- The problem you’ve noticed
- If someone has resealed it before
- Where the property is
- How we’d reach the joints
Asking for a quote is easy: let us know the job and the location. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.
New build mastic for homes and businesses in Copnor
If your new home has a leaking shower seal, open skirting joints or untidy sealant, we can help. If you’re still within the builder’s snagging or warranty period, tell them first. We’re often asked to deal with untidy sealant flagged on a snagging list and kitchen sealant that has pulled off the wall, across show homes, windows & doors and kitchens.
In smaller places like Copnor, 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.
Each job carries a 12-month guarantee, large or small.
- Location
- Copnor (PO3, PO2, PO1)
- Region
- Portsmouth
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What happens if it’s left?
A hairline gap at a skirting can wait, but water getting through can’t. If you are unsure which you have, call 0345 464 0079 or email us with pictures and we will tell you. Homes in smaller places like Copnor can face more weather, and failed outside joints let damp into walls. Inside, a split seal lets water into floors and panels just as it would anywhere.
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Why us?
- Approved under the ARBOMaster scheme
- Arbo and Everbuild products
- Fully insured
- 12-month guarantee on every job
Joints and finishes in Copnor homes
Copnor 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. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you’ve bought a new home near Fratton station, the sealant around baths, showers and frames is worth checking in the first year or two. In and around Copnor, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Copnor is about 1 mile east of Portsmouth, in Portsmouth. For new build mastic in and around Copnor, it’s easy to get a quote: please call 0345 464 0079 or email us. We cover Portsmouth from our Crawley base, Copnor included. Our Portsmouth coverage runs to 19 places, Copnor among them.
Postcode districts we cover here for new build mastic: PO3, PO2 and PO1. We cover properties on New Road, Lynn Road and Byron Road and the roads around them. You’ll find Copnor on the A288, so it’s easy for us to get to. We also cover the places around Copnor: Baffins (1 mile south-east), Kingston (1 mile south), Portsmouth (1 mile west), Fratton (1 mile south-west) and North End (1 mile north-west).
Local landmarks in Copnor
Locally, jobs take us to homes and businesses close to The Jolly Taxpayer pub, Alexandra Park and St Edmund's Catholic School, among other places. The nearest railway station is Fratton station, about 1.1 miles south-west of the centre. Nearby you will also find The Bridge Shopping Centre (1.1 miles south-west) and St Mary's Hospital (0.7 miles south). For a walk, there’s Milton Locks and Portsdown Hill.
Work for landlords, hotels and businesses
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Hotels need rooms back in use, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.
FAQs for Copnor
Can you help a landlord with a rental near Fratton station?
Yes. We work for landlords and agents as well as homeowners. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Do you cover smaller places like Copnor?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator and we’re fully insured too.
How long will you be here?
Most jobs take anything from a few hours to several days, depending on the number of plots, including the preparation. Your quote will say how long we expect yours to take.
Do you remove the old sealant?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Can you do plot mastic on a new development?
Yes. We seal plots to the developer’s programme, room by room. Tell us the plots and the joints involved for a clear quote.
Who should fix failed sealant in a new build?
While the snagging or warranty period runs, the builder should be your first contact. If it isn’t sorted, or keeps failing, get in touch with us.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done.
Should I try it myself first?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Other services in Copnor
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Resist patching a failed seal with a tube from the DIY shop
- Use the extractor fan every time you shower
- Check bath and shower seals every few months as the house settles
- Record problems with dated pictures
Leave the sealant for the cure time we give you before showering or bathing. Silicone is generally left for about a day before water reaches them.
Mould takes hold quickly in sealant that has gaps or lifted edges. Dealing with it before it goes black saves a harder job later.
Different surfaces, different methods
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 with baths filled first.
Plot handovers
Send us the schedule and any sealant specification. We seal bathrooms, kitchens, frames and floors to the agreed spec.
What we do, step by step
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a few hours for most snagging lists, longer for a run of plots, and the area is left clean. Parking around Copnor is usually easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- Each joint is checked for movement before we start.
- 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.
- We check every joint and leave you with the cure times.
Getting ready for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Keep children and pets away from the work area
- Mention if the joints have been sealed before
Getting a quote
There’s no standard price list. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or drop us an email.