Hampshire · England
Netley Marsh Window Mastic
Window mastic for Netley Marsh and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Gaps left after new windows were fitted
- A bead that does not match the frame
- Water coming in at the bottom corners of a door
Aftercare tips
Looking after new joints is easy, and it makes a real difference:
- Don’t aim a pressure washer at the joints
- Air rooms to keep condensation down around windows
- Keep drainage slots and sill grooves clear
- Don’t paint over the silicone
Check the drainage slots in the frames aren’t blocked, so water can run away instead of sitting against the joint.
Signs to watch for: split or missing mastic, gaps, damp patches inside or black mould on the reveal. If you notice one, it’s time to get the joint looked at.
About our window mastic in Netley Marsh
A cold draught around a closed window often comes from the frame edge. A new joint stops the air getting through and quietens the whistle on windy days. Where the air is getting in through the window itself, we’ll say so. We work on composite doors, aluminium frames and patio & French doors, and the jobs we see most are gaps left after new windows were fitted and cracked internal joints between frame and plaster.
Homes in small places like Netley Marsh often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
Big or small, it’s backed by our 12-month guarantee in Netley Marsh and across Hampshire.
- Location
- Netley Marsh (SO40)
- Wider area
- Hampshire
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What happens if it’s left?
A quick bead over the top of old mastic looks like an easy fix, but new sealant cannot bond to old, crumbling mastic. It soon lifts and the leak carries on behind it. Proper resealing starts with removing the old joint. In a small place like Netley Marsh, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
What you get with us
- ARBOMaster approved applicator
- Domestic, commercial and hotel work
- Sanitary silicone with an anti-fungal additive in wet areas
- Arbo and Everbuild products
Read what affects the cost or our reviews.
Netley Marsh questions
Will you come out to Netley Marsh?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is window mastic in a coastal place like Netley Marsh any different?
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. It’s worth checking the walls that face the sea first.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
Can you seal the gap between the frame and the plaster indoors?
Yes. Plenty of draughts come through the inside joint as well as the outside, so it can be worth sealing both.
Can I do it myself?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Is it OK to seal over old sealant?
No, because it fails. The old sealant always comes out first.
How much does window mastic cost in Netley Marsh?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before we start.
Do you work for landlords and businesses?
Yes. We work for homeowners, landlords, letting agents, businesses and hotels across Hampshire.
What we do, step by step
Good joint work is mostly preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. All told, the work takes anything from an hour or two to a full day, depending on how many frames there are. Somewhere like Netley Marsh needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely, along with any loose debris.
- The surfaces are cleaned and left dry.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
Before we arrive
- Keep pets and children clear of the area while we work
- Where the joints are inside, avoid wetting them before we arrive
- Tell us if parking is tricky
Get a quote
If you’re in Netley Marsh and need window mastic, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Read more
Also in Netley Marsh
How we quote for window mastic
Your quote is based on your job. We take into account:
- How many areas need sealing
- Whether there’s mould to deal with
- Whether old sealant or filler has to be cut out
- Which sealant suits the joint
Combining jobs into one visit is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. We’ll send you a clear quote for the lot.
Helping us quote
When you call or email, it’s useful to know:
- If someone has resealed it before
- Photos by email, if that is easy
- Where the property is
- If it’s domestic, commercial or a hotel
Every job is quoted individually, so the first step is telling us about yours. Simply phone 0345 464 0079 or email us and describe the job, and pictures are welcome.
Netley Marsh homes and the weather
Netley Marsh is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around window and door frames, which can dry out and crack sooner where a building faces the weather. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Schools such as Netley Marsh Church of England Infant School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. For an older house near a landmark such as Church of St Matthew, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Netley Marsh is about 1 mile west of Totton, in Hampshire. Whether you are in the middle of Netley Marsh or further out, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Across Hampshire, we cover 683 places, and Netley Marsh is one of them. There’s also a page for Southampton, roughly 6 miles from Netley Marsh.
We work across the SO40 postcode area for window mastic. If you need window mastic at a property on Ringwood Road and Woodlands Road or a nearby road, our applicators can take on the job. Close by, we work in Ashurst Bridge (1 mile south-east), Totton (1 mile east), Woodlands (1 mile south), Winsor (1 mile north-west) and Bartley (1 mile west). We also work in nearby towns such as Winchester (14 miles north-east), Eastleigh (9 miles north-east), Fareham (15 miles east), Chandler's Ford (8 miles north-east), Hedge End (10 miles east) and Lymington (11 miles south).
Near you in Netley Marsh
Around Netley Marsh, our work takes us to homes and buildings near Hounsdown School and The White Horse pub. For rail, the closest station is Ashurst New Forest station, about 1.8 miles south. Well-known places in the area include National Dairy Museum (1.8 miles south-east) and Tatchbury Mount Hospital (1.1 miles north). For a walk, there’s Testwood Lakes.
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
What we can’t put right
To be straight with you, some problems need a different trade:
- Broken hinges, locks or handles
- Damp problems in the wall away from the window
- A frame that has rotted at the joint
If you’re not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer before booking.
What we seal
- Timber windows & doors
- uPVC windows
- Patio & French doors
- Window sills
- Aluminium frames
- Composite doors
Signs you need window mastic in Netley Marsh
Mastic ages in the weather. UV light hardens the outside of the bead, and over the years it loses its give, cracks and comes away.
The most common problems we see are:
- Sealant in the wrong colour for the frame
- Old mastic that has gone black or come away
- Leaking joints at the ends of sills
- Whistling draughts around closed windows
Letting a property close to Ashurst New Forest station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Comparing quotes
- Are they insured?
- How much experience the applicator has
- How the colour is chosen
- What the quote includes, VAT included or not