Southampton · England
Itchen Window Mastic
Problem with your window and door frames in Itchen? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Rushed sealant from a window installation
- Cold air getting in at the frame edge
- Cracked or shrunken mastic around the frame
About our window mastic in Itchen
Homes in Itchen have every kind of window: from uPVC casements to timber and aluminium, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. If you are dealing with old mastic that has gone black or come away and water coming in at the bottom corners of a door, we can help.
In a smaller place like Itchen, some walls face open ground and catch the full force of the weather, so exposed windows and doors face the weather head on. The mastic around frames on those walls tends to age faster.
We guarantee the work for a year. If something is not right with it in that time, tell us and we’ll put it right.
- Place
- Itchen (SO19, SO14)
- Region
- Southampton
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
If you’ve already had a go yourself, that’s fine. We cut it out and start again.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Different surfaces, different methods
uPVC windows
Some uPVC windows were sealed at fitting with a quick bead that never bonded. It comes out, deep gaps get backing rod and the joint is resealed.
Composite doors
A composite door usually sits in a plastic outer frame, so its perimeter joint is sealed much like a window. The bead is colour-matched to the frame.
Window mastic in Itchen: local notes
Itchen is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on the mastic around window and door frames, especially on the side facing the sea. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you live in an older home near Jesus Chapel - St Mary Extra, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Schools such as Ludlow Junior School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. For landlords with property near Woolston station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Itchen is about 2 miles south-east of Southampton, in Southampton. Our applicators cover window mastic for homes and businesses in Itchen and nearby. Our Southampton coverage runs to 40 places, and Itchen is one of them.
Postcode districts we cover here for window mastic: SO19 and SO14. That includes homes and businesses on Sea Road, Oak Road and West Road and the roads around them. You will find Itchen on the A3025, so it’s easy for us to get to. Neighbouring places we cover for window mastic include Peartree Green (1 mile north-west), Northam (1 mile north-west), Sholing (1 mile east), Bitterne (1 mile north-east) and St Mary's (1 mile west). Within a short drive, we also cover Shirley (3 miles north-west), Regents Park (3 miles west), Maybush (4 miles north-west), Coxford (4 miles north-west), Freemantle (3 miles west) and Lordswood (4 miles north-west). Itchen is among the bigger towns we cover in Southampton.
Near you in Itchen
We work in homes and buildings around Houndwell Park, Woolston School and Oasis Academy Sholing, among other places. There’s a railway station in Itchen itself: Woolston station. Well-known places in the area include Bitterne Local History Society Heritage And Research Centre (0.9 miles north) and Marlands Shopping Centre (1.6 miles west). Open spaces near Itchen include Netley Common.
Common questions in Itchen
Will you come out to Itchen?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you help a landlord with a rental near Woolston station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we’ll send you a clear quote.
How long should I leave it?
Different products cure at different speeds, so follow the cure time we give you.
Can you seal over the old sealant?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Is it worth trying it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Do you seal inside as well as outside?
Yes. Plenty of draughts come through the inside joint as well as the outside, so it can be worth sealing both.
Can you get sealant to suit coloured frames?
Yes. Grey and black frames get grey or black sealant, and wood-effect frames generally suit brown.
Are you insured?
Yes. We’re fully insured.
For landlords 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.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Why deal with it now?
Working on frames from a ladder with a sealant gun is not easy, especially upstairs. We cut out properly, back deep gaps and tool every joint neatly, using a product chosen for the frame and wall. In an older home around Itchen, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
The cost depends on how much there is to do, how much old material has to come out and access to the work. You will have a clear quote before any work starts, so you know where you stand.
Why book with us
- We’re fully insured
- Neat joints and a tidy finish
- We never seal over old sealant
- Sanitary silicone with an anti-fungal additive in wet areas
Read how sealant jobs are priced and customer reviews.
The process
At the end, we look at the finished work together and tell you how long to leave it. The work normally takes most of a day for a typical house, less for a few frames, depending on the amount of work. Parking around Itchen is generally 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.
- We remove the old mastic and clean the frame edge and wall.
- 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.
Preparing for the visit
- On commercial sites, let us know about site rules
- Mention any parking rules near the property
- Let us know about earlier repairs to the joints
Ask for a quote
If you are in Itchen and need window mastic, call 0345 464 0079 or email us. Tell us what the problem is and where, and we will agree the price before any work begins.
Read more
How we quote for window mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- How easy the joints are to reach
- When we can work, for business premises
- Whether there’s mould to deal with
- The size of the job
Doing several joints on one visit normally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We will send you a clear quote for the lot.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- If it’s domestic, commercial or a hotel
- If someone has resealed it before
- The problem you’ve noticed
- Photos by email, if that’s easy
We don’t publish a price list. Instead, we give you a clear price for your job. To get started, ring 0345 464 0079 or send us an email.
Also in Itchen
How to look after the new joints
So the new joints stay in good condition:
- Keep paint off silicone joints
- Keep timber frames painted
- Wash the frames with mild soapy water
- Check the mastic once a year
A yearly look round the frames is enough. Cracks and lifting edges are easy to spot early.
A failed joint lets water into the wall a little at a time. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.