Portsmouth · England
Window & door mastic in Hilsea, Portsmouth
Mastic around window and door frames, sills and patio doors for Hilsea, backed by a one-year guarantee. Ask us for a quote.
- Leaking joints at the ends of sills
- Rushed sealant from a window installation
- Hard, cracked sealant around windows
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Keep paint off silicone joints
- Use gentle cleaners on frames and sealant
- Don’t aim a pressure washer at the joints
- Look round the frames every year or so
Clean the frames with mild soapy water, and avoid solvent cleaners on the sealant.
Look out for the warning signs: split or missing mastic, gaps, damp patches inside or black mould on the reveal. Any of these is worth a call.
About our window mastic in Hilsea
There are two joints on most windows. Outside, the mastic keeps rain out; the internal joint closes the gap to the plaster and stops draughts. Either or both can be done. We work on composite doors, timber windows & doors and uPVC windows, and the jobs we see most are rain getting in at the frame or under the sill and cracked internal joints between frame and plaster.
Many houses in smaller places like Hilsea have conservatories, garden rooms or patio doors. Those joints need the same attention as the main windows.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Where
- Hilsea (PO2, PO3, PO6)
- Region
- Portsmouth
- Guarantee
- A year, on every job
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What sealant work cannot fix
We’d rather tell you now than do work that won’t last, so here’s what sealant cannot put right:
- A door that needs adjusting, rehanging or new seals
- A sash or casement that won’t close properly
- Damp problems in the wall away from the window
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly before booking.
Surfaces we seal
- uPVC windows
- Timber windows & doors
- Patio & French doors
- Aluminium frames
- Window sills
- Composite doors
Why act early in Hilsea
If you’re painting or rendering, reseal at the same time. Fresh joints finish the job neatly, and it’s easier while the walls are being worked on anyway. In an older home around Hilsea, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we will explain what it covers.
Why Hilsea clients choose us
- Anti-fungal silicone where joints get wet
- We never seal over old sealant
- A sealant colour to suit the surroundings
- 4.9 on Google from 180+ five-star reviews
Take a look at our cost guide or what customers say.
What happens on the day
On the day, we start by going over the job with you, so you know exactly what we’re doing. We protect the surfaces around the joints before any work begins. Most jobs take a few hours for a few frames, or a day or more for a whole house. Parking around Hilsea 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 frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Tell us if parking is tricky
- Let us know if you’ve seen damp or leaks
Ask for a quote
Need a quote? Please ring 0345 464 0079 or send us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Read more
Also in Hilsea
What the job involves on each surface
uPVC windows
We clean the frame edge carefully so the plastic is not marked, then the sealant goes in between frame and wall and tooled smooth.
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A tidy bead in anthracite grey, black or a matching colour suits the frame.
Questions from Hilsea
Do you work for landlords with property near Hilsea station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Does the coastal weather in Hilsea affect outside sealant?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. Walls facing the sea are generally the first to need attention.
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’ll explain our choice.
How do I get a quote for window mastic in Hilsea?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Do the sealants smell?
Some sealants have a smell while they cure, but it fades. Ventilation helps.
Do you cover Hilsea?
Yes. We’re based in Crawley and work across South East England, London and Scotland, Hilsea included.
Can resealing stop a draught around my window?
Yes, where the draught is at the frame edge. We find where the air is coming from before we reseal.
Where do you work from?
Our base is Crawley. Our area covers South East England, London and Scotland.
For landlords and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
What we are called out for in Hilsea
Frames are never completely still. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the brick or render around it hardly moves. A sealant that cannot keep up eventually tears.
The problems people generally mention when they call are:
- Gaps where the sill meets the wall
- Rain getting in at the frame or under the sill
- Black, perished sealant on frames
- Cracked or shrunken mastic around the frame
Rented homes near Hilsea station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Before booking anyone
- Who does the work, and how experienced they are
- Whether all the old sealant comes out first
- How long to leave it before use
- Whether they’re fully insured
What window mastic looks like in Hilsea
Hilsea is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is hard on the mastic around window and door frames, especially on the side facing the sea. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For site and facilities teams at buildings such as Gatcombe Park Primary School, larger buildings have plenty of frames, and the mastic around each one ages. For an older house near a landmark such as St Francis' Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Hilsea is about 2 miles north of Portsmouth, in Portsmouth. Whether you are in the middle of Hilsea or further out, we cover window mastic for every kind of property, from flats and houses to offices and hotels. Hilsea is one of 19 towns and villages in Portsmouth we cover.
We cover every part of PO2, PO3 and PO6 for window mastic and the streets around it. If you need window mastic at a property on Vita Road, Conan Road and Arras Road or a nearby road, we can help. We also cover the places around Hilsea: Cosham (1 mile north), North End (1 mile south-west), Tipner (1 mile south-west), Wymering (1 mile north) and Rudmore (1 mile south-west). We also work in nearby towns such as Southsea (3 miles south), Portsea (3 miles south-west) and Portsmouth Point (3 miles south-west).
Local landmarks in Hilsea
In Hilsea, that means homes and buildings near Alexandra Park, Trafalgar School and Coach and Horses pub, among other places. Hilsea’s nearest station is Hilsea station, about 0.5 miles east of the centre. Nearby you’ll also find World War I Remembrance Centre (0.8 miles east) and Tricorn Centre (2.1 miles south-west). Not far away are Milton Locks and Portsdown Hill.