Hampshire · England
South Weirs Window Mastic
Professional window mastic in and around South Weirs, with every bit of old sealant taken out first and a 12-month guarantee.
- A bead that doesn’t match the frame
- Gaps where the sill meets the wall
- Rushed sealant from a window installation
Window mastic for homes and businesses in South Weirs
There are two joints on most windows. Outside, the mastic keeps rain out; inside, the joint between frame and plaster stops draughts and tidies the reveal. We seal one or both, depending on what’s needed. Common call-outs are for gaps between the frame and the inside reveal and gaps where the sill meets the wall, across aluminium frames, window sills and patio & French doors.
Somewhere as small as South Weirs, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
You get a 12-month guarantee, the same in South Weirs as everywhere else we work.
- Place
- South Weirs (SO42)
- Region
- Hampshire
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
When it is not the sealant
To be straight with you, there are a few things sealant won’t fix:
- A sash or casement that won’t close properly
- Draughts through the window seals rather than the frame
- Condensation trapped between the panes
If you’re not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer before you book.
Where we work in South Weirs
- Timber windows & doors
- uPVC windows
- Aluminium frames
- Patio & French doors
- Window sills
- Composite doors
What happens on the day
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, carry out the job and clear up. Most jobs take most of a day for a typical house, less for a few frames. For a village or hamlet like South Weirs, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
Getting ready for the visit
- On commercial sites, let us know about site rules
- Clear the area around the work
- Let us know about stairs, lifts or work at height
Getting a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Read more
South Weirs questions
Is South Weirs in your area for window mastic?
Yes, South Weirs is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear price.
Do you cover smaller places like South Weirs?
Yes. South Weirs 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.
Do you guarantee window mastic?
Yes, with our 12-month guarantee. Keeping drainage clear and checking the joints yearly helps them last.
Will it make a mess?
We keep the work tidy. We protect what’s around the joints.
Do I have to be there?
It depends on the job. Inside work needs someone to give us access.
What does window mastic cost?
Every job is different, so each one gets its own quote. For a quick quote, phone 0345 464 0079 or email us with a short description of the job.
Can you do the inside joint as well?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We can do either or both.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done and you will get one quote.
Landlords, agents and businesses in South Weirs
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
In hotels, rooms out of use cost money, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
How the job changes by surface
Window sills
Sills catch the water running down the glass, so the joints at each end and underneath matter. They’re cut out and resealed with exterior sealant.
Patio & French doors
Patio and French doors have the longest joints on most houses. Most leaks start at the bottom corners, so we pay close attention there.
Nearby places to South Weirs
Other services in South Weirs
Do you need window mastic in South Weirs?
A lot of older mastic was never designed to stay flexible. Once it’s rigid, every bit of frame movement pulls at it, and a gap opens along one edge.
These are the problems we are asked about most:
- Gaps between the frame and the inside reveal
- Rain getting in at the frame or under the sill
- Old mastic that has gone black or come away
- Mastic that has split away from the wall
Managing a site like Brockenhurst Church of England Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
Comparing quotes
- What the cure time is
- The length of the guarantee
- Who does the work, and how experienced they are
- Whether they’re fully insured
What happens if it’s left?
A cracked joint around a frame lets rain into the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. Resealing now is a small job by comparison. Around South Weirs, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
What it costs depends on the amount of work, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts.
Why choose Mr Mastic in South Weirs
- 20+ years of sealant experience
- Arbo and Everbuild products
- 4.9 on Google from 180+ five-star reviews
- We never seal over old sealant
See what affects the cost and our reviews.
DIY versus a professional finish
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Window mastic in South Weirs: local notes
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.
In the older streets around Church of St Saviour, frames set in older brick or stone need a sealant that suits the wall as well as the frame. If you let a flat or house near Brockenhurst station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
South Weirs is about 4 miles north-west of Lymington, in Hampshire. Our applicators cover window mastic for homeowners, landlords and businesses in South Weirs and nearby, as part of our work across Hampshire. Across Hampshire, we cover 683 places, South Weirs among them. We also work in Southampton, about 11 miles from South Weirs.
Our applicators cover all of SO42 for window mastic and the streets around it. We also cover Brockenhurst (1 mile north-east), Setley (1 mile east), Balmerlawn (2 miles north-east), Emery Down (4 miles north) and Lyndhurst (4 miles north). We also work in nearby towns such as Eastleigh (15 miles north-east), Totton (8 miles north-east), Chandler's Ford (15 miles north-east), Hedge End (15 miles north-east), Lymington (4 miles south-east) and Romsey (13 miles north).
Near you in South Weirs
The closest station to South Weirs is Brockenhurst station, about 0.9 miles east. Nearby you will also find Lymington New Forest Hospital (3.7 miles south-east).