Hampshire · England
Window & door mastic in Andover, Hampshire
Problem with your window and door frames in Andover? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Cold air getting in at the frame edge
- Cracked internal joints between frame and plaster
- Gaps left after new windows were fitted
Window mastic in Andover
A window frame and the wall around it expand and shrink at different rates. Heat and cold make frames grow and shrink against brick or render that hardly moves. That’s why the joint needs a flexible, low-modulus sealant rather than something rigid. If you have gaps left after new windows were fitted and water coming in at the bottom corners of a door, we can put it right, on aluminium frames, window sills and patio & French doors alike.
Walls in Andover that face the prevailing wind take the most weather, so the mastic there tends to fail first. Checking every frame, not just the obvious one, is time well spent.
Our work is backed for twelve months, in Andover and everywhere else we cover.
- Where
- Andover (SP10, SP11)
- Region
- Hampshire
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
When something else is needed
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Broken hinges, locks or handles
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Rotten timber, which needs a joiner first
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before booking.
Joints and surfaces we work on
- Patio & French doors
- uPVC windows
- Composite doors
- Timber windows & doors
- Window sills
- Aluminium frames
How it works
Most of a good job is in the preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. In total, it usually takes a few hours for a few frames, or a day or more for a whole house. Parking in a town like Andover is normally straightforward, but tell us if there’s a driveway or any restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely.
- The surfaces are cleaned and left dry.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Keep children and pets away from the work area
- Clear items away from the joints we are working on
Get a quote
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
Related advice
Frames and glazing around Andover
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.
Managing a site like St John the Baptist Catholic Primary School? Then the mastic around its windows and doors needs looking after like any other building’s. Letting a property close to Andover station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Andover is about 17 miles west of Basingstoke, in Hampshire. We carry out window mastic for homes and businesses in Andover, as part of our work across Hampshire. Our Hampshire coverage runs to 683 places, Andover among them. There’s also a page for Southampton, roughly 21 miles from Andover.
Postcode districts we cover here for window mastic: SP10 and SP11. Window mastic is available to properties on High Street, Goddard Square and London Road. Andover sits on or near the A303 and A342. Neighbouring places we cover for window mastic include Picket Twenty (1 mile east), East Anton (1 mile north-east), Knights Enham (1 mile north), Finkley Down (2 miles north-east) and Picket Piece (2 miles east). Larger places within reach include Winchester (13 miles south-east), Romsey (15 miles south), Hyde (12 miles south-east), Tidworth (8 miles west), Weeke (12 miles south-east) and Kempshott (15 miles east). Being one of Hampshire’s larger places, Andover has every kind of property, from flats to offices.
Near you in Andover
Locally, jobs take us to homes and businesses close to The Angel Inn, Winton Community Academy and Winton Community Academy. The closest station to Andover is Andover station, roughly 0.5 miles west of the centre. Well-known places in the area include Andover War Memorial Hospital (0.7 miles north-west) and Andover Museum (within half a mile east). Open spaces near Andover include Anton Lakes and Mill Lake.
Andover: your questions answered
Can you do window mastic in Andover?
Yes. Our work covers London and the South East, and Andover is part of that. You can call 0345 464 0079 or send us an email and tell us what needs doing, and we’ll send you a clear quote.
What guarantee comes with window mastic in Andover?
All our work, in Andover and everywhere else, comes with a 12-month guarantee. We’re also fully insured and ARBOMaster approved.
What do you need from me for a quote?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply ring 0345 464 0079 or send us an email.
Can you do several jobs on one visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Are you fully insured?
Yes. We’re fully insured.
Is it OK to seal over old sealant?
No. The old sealant always comes out first, so the new joint bonds to clean surfaces.
Do you have sealant for grey or black windows?
Yes. Anthracite grey, black, brown and white cover most frames, with clear as an option.
Landlord and commercial work in Andover
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
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.
When to call us in Andover
Plenty of failed mastic was poorly applied in the first place. Sealant run over dust, wet brick or loose mortar didn’t grip properly, so it comes away long before its time.
People usually contact us after spotting one of these:
- Cold air getting in at the frame edge
- Water coming in at the bottom corners of a door
- Gaps left after new windows were fitted
- Draughty joints inside around the window
Homes close to Church of St Mary include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Questions to ask before booking
- How long to leave it before use
- Which colour the sealant will be
- What product goes in the joint
- Who turns up on the day
Nearby places to Andover
More services for Andover
Can I do it myself?
If you are 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 fails, we can still redo it.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
How the job changes by surface
Composite doors
An exposed front door gets wind-driven rain, and the top and bottom corners tend to fail first. We pay most attention there.
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A neat, narrow bead in a colour to match suits the frame.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Wash the frames with mild soapy water
- Ventilate rooms so frames don’t stay wet inside
- Keep paint off silicone joints
- Check the mastic once a year
Timber frames need their paint kept up, because bare, wet timber moves more and pulls at the joint. Keep paint off the silicone itself.
On timber windows, water behind the joint can lead to rot. Rotten timber needs a joiner, not a sealant, so early resealing is worth it.