Hampshire · England
Cadnam Window Mastic
Window mastic for Cadnam and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Old mastic that has gone black or come away
- Damp patches on the reveal after heavy rain
- Cold air getting in at the frame edge
About our window mastic in Cadnam
Frames and walls don’t move together. Heat and cold make frames grow and shrink against brick or render that hardly moves. So the sealant has to stretch and recover, which is why we use a low-modulus product. If you are dealing with cold air getting in at the frame edge and hard, cracked sealant around windows, we can put it right, whatever the surface.
Outdoor sealant needs dry, clean surfaces, so work on frames around Cadnam is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we will put it right.
- Where
- Cadnam (SO40)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
When to call us in Cadnam
Water runs down the glass onto the sill, so the sill ends and the joint below the frame are common leak points. When that sealant fails, water gets into the wall or under the frame.
If you can see any of these, it’s time to have the joints looked at:
- Gaps where the sill meets the wall
- Damp patches on the reveal after heavy rain
- Whistling draughts around closed windows
- Old mastic that has gone black or come away
If you look after a building such as Bartley Church of England Junior School, the mastic around its windows and doors needs looking after like any other building’s.
Before booking anyone
- What guarantee comes with the work
- Which colour the sealant will be
- How hidden problems are handled
- Who turns up on the day
Quotes for window mastic in Cadnam
For a quick quote, just ask. What matters most is:
- How much old sealant there is and how hard it is to remove
- Access and height
- How many areas need sealing
- The number and length of the joints
The cost depends on how much there is to do, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- The rough size of the job
- Any access issues, like height or stairs
- What’s wrong with the joints now
- Whether it has been sealed before
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job.
Work for landlords, hotels and businesses
Landlords and letting agents in Cadnam can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
Housing providers, facilities teams and property managers book us too in Cadnam and across Hampshire. Several sites can be quoted together.
What window mastic looks like in Cadnam
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. Historic houses like Landford Manor (about 4.6 miles north-west) are a reminder that the area around Cadnam has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
If you let a flat or house near Ashurst New Forest station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. For an older house near a landmark such as Church of St Mary, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Cadnam is about 3 miles west of Totton, in Hampshire. Cadnam gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Cadnam is one of 683 places in Hampshire where we work for window mastic. You can also see our page for Southampton, roughly 8 miles from Cadnam.
Work in SO40 works the same way as everywhere else we cover. That includes homes and businesses on Old Lyndhurst Road, White Hart Lane and Southampton Road. We also cover the places around Cadnam: Wittensford (1 mile west), Bartley (1 mile south-east), Copythorne (1 mile north-east), Newbridge (1 mile north) and Winsor (1 mile east). Larger places within reach include Winchester (15 miles north-east), Eastleigh (11 miles east), Totton (3 miles east), Chandler's Ford (9 miles north-east), Hedge End (12 miles east) and Lymington (11 miles south).
What’s near Cadnam
Around Cadnam, our work takes us to homes and buildings near The White Hart pub, among other places. For rail, the closest station is Ashurst New Forest station, roughly 3.1 miles south-east. Well-known places in the area include Tatchbury Mount Hospital (2.2 miles east) and National Dairy Museum (3.6 miles south-east). For a walk, there’s Copythorne Common.
What the job involves on each surface
uPVC windows
Plastic frames move a lot between a hot afternoon and a cold night, so the joint needs a low-modulus sealant that stays flexible. White is the usual colour, with brown, anthracite grey and black for coloured frames.
Timber windows & doors
Where timber has rotted at the joint, it needs repairing first. If we find rot, we’ll tell you before going ahead, as that is a job for a joiner.
FAQs for Cadnam
Do you cover smaller places like Cadnam?
Yes. Cadnam is within the area we cover, which takes in towns, villages and rural addresses. Our work covers 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 Ashurst New Forest station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear quote.
Can you match the sealant to my frames?
Usually, yes. Tell us the frame colour when you get in touch and we will match it as closely as we can.
Can you do several jobs on one visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
How long before the joint can be used?
Many sealants skin over quickly but take longer to cure fully. We will tell you how long to leave the joint.
How long will my window job take?
The work takes a few hours for a handful of frames, longer for a whole house. Access and how stubborn the old mastic is affect the time most.
Which products do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we’ll tell you what we are using.
Should I try DIY first?
Sometimes. 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.
Why act early in Cadnam
Redecorating is a good moment to renew the mastic. Fresh joints finish the job neatly, and it’s easier while the walls are being worked on anyway. Where a wall is exposed, as many are in small places like Cadnam, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
The cost reflects the work involved, not guesswork. That is why we ask about the job first.
Why choose Mr Mastic in Cadnam
- 20+ years of sealant experience
- Rated 4.9 stars on Google
- Sealant colour chosen to suit
- Tidy, careful work
Read our cost guide or what customers say.
What we do, step by step
There’s no need to move everything out before we come, only the area right around the joints. We protect the rest, and the work takes most of a day for a typical house, less for a few frames for a typical job. Somewhere as small as Cadnam, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
Getting ready for the visit
- Keep children and pets away from the work area
- Let us know if you’ve seen damp or leaks
- Where the joints are inside, avoid wetting them before we arrive
How to get a quote
To get a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You will have a clear quote before we start.
Advice
Can I do it myself?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.