Portsmouth · England
Portsmouth Point New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes in Portsmouth Point, with a one-year guarantee on every job. Ask us for a quote.
- Kitchen sealant that has pulled off the wall
- Messy sealant that spoils new finishes
- Cracked caulk along new skirting
How we handle new build mastic in Portsmouth Point
Dust is the enemy of new-build sealant. Each joint is cleaned of dust and primed where the product calls for it, so the sealant actually sticks. Common call-outs are for joints pulling apart as timber shrinks and internal frame sealant that has split, across kitchens, show homes and bathrooms & en suites.
Homes around Portsmouth Point range from older cottages to newer houses, and their floors range just as widely, from timber that moves with the seasons to tiles laid on concrete. Skirting and threshold joints need a sealant that suits the floor.
Big or small, it’s backed by our one-year guarantee in Portsmouth Point and across Portsmouth.
- Where
- Portsmouth Point (PO1, PO5, PO12)
- Wider area
- Portsmouth
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Quotes for new build mastic in Portsmouth Point
You will get a clear quote before we start. It’s based on:
- Whether the work is at height
- The size of the job
- Whether old sealant or filler has to be cut out
- The type of sealant required
Leaving a failed joint normally makes the job bigger, not smaller. If you’re unsure, phone 0345 464 0079 or send us an email for an honest opinion and a quote.
Helping us quote
To make quoting easier, please include:
- Any previous sealing or DIY work
- How we’d reach the joints
- Whether it’s a home or a business
- Roughly how big the job is
Getting a quote is simple: let us know the job and the location. A few photos by email make the job easier to understand, and we will come back to you with a quote.
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Watch for new gaps as the house dries out
- Open a window or run the fan after bathing
- Avoid scourers and strong chemicals on sealant
- Keep water off fresh sealant until it has cured
Watch the joints as the house settles. Small gaps can appear as the house dries.
If a shower tray or bath seal splits in the first year, look for movement. Have it resealed, and the tray or bath checked, before it gets worse.
When to call us in Portsmouth Point
New homes are full of moisture from plaster, screed and concrete, which takes a year or two to dry out. As it does, timber shrinks and joints open and the sealant has to cope with the movement.
The most common problems we see are:
- Sealant that never bonded to the surface
- Shower seals failing in the first year or two
- Gaps opening as the house dries out and settles
- Internal frame sealant that has split
If you’ve bought a new home near Portsmouth Harbour station, the sealant around baths, showers and frames is worth checking in the first year or two.
What to look for in a quote
- Whether the sealant suits the joint
- Whether they’re fully insured
- How the colour is chosen
- How much experience the applicator has
FAQs for Portsmouth Point
I let a flat near Portsmouth Harbour station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Do you cover smaller places like Portsmouth Point?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you remove the old sealant?
Yes, always, and completely. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Are you fully insured?
Yes. We’re fully insured, and we have been doing sealant work for more than 20 years.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator and we’re fully insured too.
Where is Mr Mastic based?
Our base is in Crawley, and we work across South East England, London and Scotland.
When is the best time to reseal in a new build?
If the seal has failed and water is getting in, do it now. Small gaps that are just cosmetic can be resealed once movement has slowed.
Also near Portsmouth Point
More services for Portsmouth Point
DIY versus a professional finish
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Joints and finishes in Portsmouth Point homes
Portsmouth Point is close to 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. 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 Portsmouth Point, as everywhere, new build mastic is only as good as the preparation behind it.
Portsmouth Point is about 2 miles west of Southsea, in Portsmouth. From the centre of Portsmouth Point to the outskirts, new build mastic is available for homes and businesses alike, from flats and houses to offices and hotels. We cover 19 towns and villages across Portsmouth.
We work across PO1, PO5 and PO12 for new build mastic. We cover properties on Park Road, Nobbs Lane and Bath Square and the roads around them. We also cover Portsea (1 mile north), Clayhall (1 mile south-west), Haslar (1 mile 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), Paulsgrove (4 miles north), Cosham (4 miles north-east), Drayton (5 miles north-east) and Farlington (5 miles north-east).
Landmarks near Portsmouth Point
Locally, jobs take us to homes and businesses close to Charter Academy, Portsmouth Grammar School and Bridge Tavern, among other places. There’s a railway station in Portsmouth Point itself: Portsmouth Harbour station. A little further out are Southsea Castle (1.2 miles south-east) and Portsmouth Museum And Art Gallery (less than half a mile east). Green spaces nearby include Portsdown Hill and Milton Locks.
What happens on the day
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes a few hours in a single home from start to finish. Parking around Portsmouth Point 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.
- First, the list of joints is agreed from your snagging sheet or plot schedule.
- The failed sealant is removed completely, with no layer left behind.
- Joints are vacuumed and cleaned of building dust.
- We prime where needed and apply a sealant suited to each joint.
- We tool every joint neatly and tell you when each area can be used.
Preparing for the visit
- Mention if the joints have been sealed before
- Tell us about any water getting in
- Tell us if parking is tricky
Getting a quote
We don’t publish a price list. Instead, we give you a clear price for your job. To arrange one, phone 0345 464 0079 or drop us an email.
Advice
Surface by surface
Bathrooms and en suites
En suite seals are easy to miss on a snagging list until they leak. A proper reseal keeps water in the tray.
Skirting and floors
Wet-area floor joints need a flexible seal. We seal them with a sealant suited to wet areas.
Work for landlords, hotels and businesses
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 that we can handle for you.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will give you a quote.