Hampshire · England
Window Mastic in Alderholt
Mastic around window and door frames, sills and patio doors for homes and businesses in Alderholt and across Hampshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Cracked internal joints between frame and plaster
- Mastic that is falling out in pieces
- Cold air getting in at the frame edge
Window mastic in Alderholt, done properly
Colour matters on a frame. We can seal in white, brown, anthracite grey, black or clear, so the line suits the frame instead of standing out. We work on window sills, timber windows & doors and composite doors, and common reasons people get in touch are cold air getting in at the frame edge and black, perished sealant on frames.
Many houses in smaller places like Alderholt have conservatories, garden rooms or patio doors. Their glazing joints and frame seals are as much a part of the job as the windows, and any older timber or sash windows need a sealant that suits them.
All our work is covered by our 12-month guarantee.
- Where
- Alderholt (SP6)
- Wider area
- Hampshire
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
How we quote for window mastic
There’s no set price list, because jobs vary so much. The quote depends on:
- Working hours on commercial sites
- Any mould that needs treating
- The number of rooms or windows
- The old material and how stubborn it is
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we’ll explain what it covers.
Helping us quote
When you call or email, these details help:
- The address or postcode of the job
- Roughly how big the job is
- The type of property
- A few photos by email, if you can
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. Whenever you are ready, call 0345 464 0079 or email us.
Honest limits
To be straight with you, there are a few things sealant will not fix:
- Draughts through the window seals rather than the frame
- Faulty window hardware
- Damp coming through the wall itself rather than the frame joint
If in doubt, ring 0345 464 0079 or send us an email and we will say what we think.
Surfaces we seal
- Patio & French doors
- Window sills
- Aluminium frames
- uPVC windows
- Timber windows & doors
- Composite doors
How the job changes by surface
uPVC windows
The frame is cleaned with a product that will not harm the plastic, then the new bead is laid against the frame and the wall.
Aluminium frames
Coated aluminium needs a compatible sealant and we avoid acetoxy silicones, which can react with some metals. Neutral-cure sealant is the safe choice.
DIY versus a professional finish
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
What we’re called out for in Alderholt
Sun, frost and rain wear sealant out. Sunlight dries the surface out, and over the years it loses its give, cracks and comes away.
People usually contact us when they notice one of these:
- Mastic that has split away from the wall
- Mastic that is falling out in pieces
- Gaps between the frame and the inside reveal
- Cold air getting in at the frame edge
Managing a site like St James' Church of England First School? Then its window and door frames need their mastic kept sound, just like a home’s.
Questions to ask before you book
- How the surfaces are prepared before sealing
- Whether VAT is included
- What happens if the job turns out different
- How long to leave it before use
Common questions in Alderholt
Do you cover Alderholt for window mastic?
Yes. We work across London and the South East, and Alderholt is part of that. Just call 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear price.
What guarantee comes with window mastic in Alderholt?
All our work, in Alderholt and everywhere else, comes with a 12-month guarantee. We’re also fully insured and ARBOMaster approved.
I’m a tenant. Can you help?
Yes, but check with your landlord or agent first. Landlords are often happy for the work to be arranged.
When is the sealant fully cured?
That depends on the sealant used, so follow the cure time we give you when we finish.
How much does window mastic cost in Alderholt?
Size, access and the old material all affect the cost. Ask us for a quote and we will talk you through it.
Do you work for letting agents?
Yes, often. We can quote for several properties at once.
Can you seal the gap between the frame and the plaster indoors?
Yes. The outside joint keeps the weather out, and the inside joint stops draughts and finishes the reveal. We do one or both.
Is it messy?
Tidy work is part of the job. Nearby surfaces are protected, and we clear up when we’re done.
Landlord and commercial work in Alderholt
Landlords and agents in Alderholt can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
How the visit works
At the end, we look at the finished work together and tell you how long to leave it. The visit itself generally takes a morning for a couple of windows and a door, depending on the amount of work. Parking around Alderholt is usually easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- 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, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Clear items away from the joints we’re working on
- Tell us about any water getting in
Ask for a quote
If you are in Alderholt and need window mastic, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
Related advice
Places near Alderholt
Other services in Alderholt
What window mastic looks like in Alderholt
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. With historic houses such as Breamore House (about 4.5 miles north-east) nearby, there’s older building stock in the area around Alderholt as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
In the older streets around Church of St James, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Alderholt is in Hampshire. Wherever you are in the SP6 postcode area, we can carry out window mastic at your property. Our Hampshire coverage runs to 683 places, Alderholt among them. We also work in Southampton, about 19 miles from Alderholt.
Work in SP6 is quoted and booked the same way as anywhere else. If you need window mastic at a property on Station Road, Antell's Way and South Hill or a nearby road, we can help. Being close to the B3078, Alderholt is simple for us to get to for window mastic. Nearby, we also carry out window mastic in Sandleheath (1 mile north), Ashford (2 miles north-east), Broxhill (2 miles west), Damerham (2 miles north-west) and Rockbourne (4 miles north). Larger places within reach include Totton (14 miles east), New Milton (13 miles south-east), Ringwood (5 miles south-east), Barton on Sea (14 miles south-east), Ashley (13 miles south-east) and St Leonards (6 miles south).
Around Alderholt
Locally, jobs take us to homes and businesses close to The Churchill Arms and The Burgate School and Sixth Form and the streets around them. A little further out are Godshill Castle Hill (3.6 miles north-east) and Fordingbridge Doll Museum (2 miles north-east). Not far away are Blashford Lakes and Linbrook Lake.