Portsmouth · England
Window Mastic in Paulsgrove
We cover Paulsgrove for mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly.
- White mastic on grey or black frames
- Rushed sealant from a window installation
- Whistling draughts around closed windows
Window mastic in Paulsgrove
Most frames have an outside joint and an inside one. The external joint is the weather seal; the internal joint closes the gap to the plaster and stops draughts. We seal one or both, depending on what’s needed. If you have gaps where the sill meets the wall and cracked internal joints between frame and plaster, we can help.
Around Paulsgrove, conservatories, garden rooms and patio doors are often part of the house. Those joints need the same attention as the main windows.
Each job carries a 12-month guarantee, whatever its size.
- Location
- Paulsgrove (PO6)
- Wider area
- Portsmouth
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
How the job changes by surface
Composite doors
Front doors take the weather head on, and the top and bottom corners tend to fail first. Those corners get the most care.
uPVC windows
uPVC expands and contracts noticeably with temperature, so we use a flexible, low-modulus sealant. We match white, brown, anthracite grey and black frames.
What sealant work cannot fix
Some problems need a builder, plumber or other trade rather than us:
- Worn gaskets, brush seals or a door that has dropped
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Penetrating damp from a failed cavity tray or render
If you are not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer.
Joints and surfaces we work on
- Composite doors
- uPVC windows
- Aluminium frames
- Timber windows & doors
- Patio & French doors
- Window sills
What affects the cost of window mastic
You’ll get a clear quote before any work starts. It takes into account:
- Mould in or behind the old joints
- The product the joint needs
- How much old sealant there is and how hard it is to remove
- Access and height
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you’re not sure whether it needs doing, ring 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Helping us quote
You don’t need to know the technical terms. Just tell us:
- The problem you’ve noticed
- Any access issues, like height or stairs
- Whether it’s a home or a business
- Whether it has been sealed before
We quote each job on its own. Just call 0345 464 0079 or email us with the details and send pictures if you have them.
Paulsgrove: your questions answered
Does the coastal weather in Paulsgrove affect outside sealant?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. The right product, a clean joint and the right depth all help it cope.
Can you help a landlord with a rental near Cosham station?
Yes. We work for landlords and agents as well as householders. You can call 0345 464 0079 or email us with the details for a clear quote.
Where is Mr Mastic based?
We are a Crawley-based firm. Our area covers South East England, London and Scotland.
Can I paint over the new sealant?
Not if it’s silicone. Tell us your decorating plans and we’ll pick a sealant to suit.
Do you have sealant for grey or black windows?
Yes. We can use white, brown, anthracite grey, black or clear.
Should I try DIY first?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we will explain our choice.
Will it make a mess?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Window mastic in Paulsgrove: local notes
Paulsgrove is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around window and door frames, which can dry out and crack sooner where a building faces the weather. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as St Michael and All Angels, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. For site and facilities teams at buildings such as Beacon View Primary Academy, the mastic around its windows and doors needs looking after like any other building’s. Rented homes near Cosham station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
Paulsgrove is about 3 miles north of Portsmouth, in Portsmouth. Jobs in Paulsgrove get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Our area takes in 19 places across Portsmouth.
Here we cover the PO6 postcode area for window mastic. Whether your property is on Bourne Road, Ludlow Road and Farmlea Road or a nearby road, our applicators can take on the job. Paulsgrove sits on or near the M27 and A27. We also cover Wymering (1 mile east), Cosham (1 mile east), Hilsea (2 miles south-east), Widley (2 miles east) and Purbrook Heath (2 miles north-east). Further out, we also cover Portsmouth (3 miles south), Southsea (5 miles south), Milton (4 miles south), Landport (3 miles south), Baffins (3 miles south-east) and Portsea (4 miles south).
Around Paulsgrove
Locally, jobs take us to homes and businesses close to Alexandra Park, The Sir Alec Rose pub and Castle View Academy, among other places. Paulsgrove’s nearest station is Cosham station, roughly 1.2 miles south-east. Well-known places in the area include Queen Alexandra Hospital (1.1 miles east) and World War I Remembrance Centre (2.2 miles south-east). For a walk, there’s Southmoor Nature Reserve and Portsdown Hill.
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Keep paint off silicone joints
- Don’t use solvent cleaners on the joint
- Keep jet washers away from the mastic
- Wash the frames with mild soapy water
Timber frames need their paint kept up, because bare, wet timber moves more and pulls at the joint. Keep paint off the silicone itself.
Water gets in quietly when mastic fails. You might not see it until plaster blows or a damp patch appears inside. Catching it early keeps the fix to a reseal.
Landlord and commercial work in Paulsgrove
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.
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Towns and villages near Paulsgrove
More services for Paulsgrove
Why deal with it now?
The work is quick compared with the damage it prevents: it takes a few hours for a few frames, or a day or more for a whole house. Leave it until water is coming in and you may need plastering and decorating as well. Homes in smaller places like Paulsgrove 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: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
What you get with us
- Fully insured
- Any old sealant cut out fully, not covered over
- Anti-fungal silicone where joints get wet
- Approved under the ARBOMaster scheme
See our cost guide or our reviews.
How it works
Good joint work is mostly preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. In total, it normally takes a morning for a couple of windows and a door. A visit to Paulsgrove is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Getting ready for the visit
- Move anything stored near the joints
- Let us know about earlier repairs to the joints
- Keep pets and children clear of the area while we work
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. Whenever you’re ready, call 0345 464 0079 or drop us an email.