Hampshire · England
South Warnborough Window Mastic
Our applicators work in South Warnborough on mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Gaps left after new windows were fitted
- Black, perished sealant on frames
- White mastic on grey or black frames
Window mastic for homes and businesses in South Warnborough
Every window and door frame has a gap around it, and mastic is what closes it. When it cracks, hardens or pulls away, draughts and rain get in. Our applicators cut it out and replace it with a flexible, weatherproof sealant. If you’re dealing with whistling draughts around closed windows and gaps between the frame and the inside reveal, we can put it right.
Homes in small places like South Warnborough often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
A 12-month guarantee comes as standard.
- Where
- South Warnborough (RG29)
- Region
- Hampshire
- Guarantee
- One year on every job
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Landlords, agents and businesses in South Warnborough
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
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.
Also near South Warnborough
Other services in South Warnborough
Different surfaces, different methods
Window sills
Where a sill meets brick or render, the ends often crack first. A tight seal at each end keeps rain out of the wall.
Aluminium frames
Aluminium needs a sealant that bonds to coated metal and we avoid acetoxy silicones, which can react with some metals. We use a neutral-cure product.
Common questions in South Warnborough
Can you help a landlord with a rental near Hook station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before we start.
Do you cover South Warnborough for window mastic?
Yes. Our work covers London and the South East, and South Warnborough is part of that. Just call 0345 464 0079 or send us an email with a few details of the job, and we’ll send you a clear quote.
Does someone need to be in?
That depends on where the joints are. Inside work needs someone to give us access, and for outside work we’ll agree access with you when we book.
Do you do commercial work?
Yes. We have worked for hotels, offices and other businesses.
Does the work come with a guarantee?
Yes. Our 12-month guarantee covers every job, inside or out.
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 I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
What do you put in the joint?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Clean frames with a soft cloth and soapy water
- Avoid blasting the frames with a pressure washer
- Avoid harsh chemicals near the mastic
- Make sure the drainage slots aren’t blocked
Try not to touch the new joint while it cures, following the cure time we give you. Keep jet washers away from the frames.
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.
Honest limits
To be straight with you, some problems need a different trade:
- A failed sealed unit that has misted up
- Soft or decayed wood in the frame
- Worn gaskets, brush seals or a door that has dropped
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
Where we work in South Warnborough
- Timber windows & doors
- Composite doors
- Patio & French doors
- Aluminium frames
- uPVC windows
- Window sills
Windows and doors in South Warnborough
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.
For site and facilities teams at buildings such as Robert May's School, its window and door frames need their mastic kept sound, just like a home’s. In the older streets around Church of St Andrew, 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 Hook station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
South Warnborough is about 5 miles north of Alton, in Hampshire. South Warnborough gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. South Warnborough is one of 683 towns and villages in Hampshire we cover. You can also see our page for Reading, about 16 miles away.
Here we cover the RG29 postcode area for window mastic. That includes homes and businesses on Gaston Lane, Tigwells Field and Alton Road. We also cover Long Sutton (1 mile east), Bidden (1 mile north-west), Little Hoddington (1 mile north-west), Well (2 miles east) and Greywell (3 miles north). Within a short drive, we also cover Basingstoke (7 miles north-west), Farnborough (10 miles north-east), Fleet (7 miles north-east), Aldershot (9 miles east), Alton (5 miles south) and Petersfield (15 miles south).
Near you in South Warnborough
The closest station to South Warnborough is Hook station, about 3.9 miles north of the centre. Well-known places in the area include Odiham Castle (2.7 miles north) and Gliding Heritage Centre (3.5 miles south-west). For a walk, there’s Holybourne Hill and Dogmersfield Lake.
What we do, step by step
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take a few hours for a few frames, or a day or more for a whole house. Somewhere like South Warnborough needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely, along with any loose debris.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Getting ready for the visit
- Mention any parking rules near the property
- Clear the area around the work
- Let us know if you’ve seen damp or leaks
Get a quote
Want a quote for window mastic? Please call 0345 464 0079 or email us with a few details. We’ll explain what we’d do and send you a clear quote before any work starts.
Related advice
Quotes for window mastic in South Warnborough
Call for a quick quote. The main things that affect it are:
- Whether there’s mould to deal with
- How easy the joints are to reach
- How much there is to do
- The type of sealant required
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first.
What to tell us for a quote
When you contact us, these details help:
- Access, such as stairs, a lift or height
- The rough size of the job
- Pictures of the joints, sent by email
- Any previous sealing or DIY work
Every job is quoted individually, so start by telling us what you need. Simply phone 0345 464 0079 or email us and describe the job, and pictures are welcome.