Hampshire · England
Window & door mastic in Sleaford, Hampshire
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in Sleaford. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Gaps where the sill meets the wall
- Rain getting in at the frame or under the sill
- Draughty joints inside around the window
How the visit works
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes a few hours for a handful of frames, longer for a whole house and we leave things clean and tidy. For a village or hamlet like Sleaford, 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.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- Mention if the joints have been sealed before
- Let us know about stairs, lifts or work at height
- Try not to wet indoor joints just before the visit
Ask for a quote
We do not publish a price list. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or email us.
Advice
Window mastic in Sleaford
Over two decades of sealing frames has taught us which products suit which walls. We are fully insured ARBOMaster approved applicators, and we give a 12-month guarantee on the work. We are often asked to deal with gaps where the sill meets the wall and cold air getting in at the frame edge, on composite doors, timber windows & doors and uPVC windows.
Mastic can only go onto a dry, clean joint, so window work in Sleaford is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- Sleaford (GU35)
- Wider area
- Hampshire
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Also in Sleaford
Signs you need window mastic in Sleaford
Every frame moves through the day. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the brick or render around it hardly moves. A sealant that cannot keep up eventually tears.
These are the problems we’re asked about most:
- Damp patches on the reveal after heavy rain
- Mastic that is falling out in pieces
- Cracked internal joints between frame and plaster
- Gaps left after new windows were fitted
Rented homes near Bentley (Hampshire) station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
Comparing quotes
- What happens if the job turns out different
- Is VAT in the price?
- Who turns up on the day
- Whether all the old sealant comes out first
What the job involves on each surface
Aluminium frames
Coated aluminium needs a compatible sealant. Neutral-cure sealant is the safe choice.
uPVC windows
The frame is cleaned with a product that will not harm the plastic, then the sealant goes in between frame and wall.
What window mastic looks like in Sleaford
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 Mill Chase Academy? Then the mastic around its windows and doors needs looking after like any other building’s. If you live in an older home near Church of All Saints, the joint between an old wall and a newer frame is usually the first place rain gets in.
Sleaford is about 5 miles east of Alton, in Hampshire. From the centre of Sleaford to the outskirts, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Sleaford is one of 683 places in Hampshire we cover for window mastic. For nearby work, see our Reading page, about 22 miles away.
Work in GU35 is quoted and booked the same way as anywhere else. Neighbouring places we cover for window mastic include Kingsley (1 mile west), Pinewood Village (1 mile south), Lindford (1 mile south), Frithend (1 mile north) and Bordon (2 miles south). Within a short drive, we also cover Basingstoke (14 miles north-west), Farnborough (12 miles north), Fleet (10 miles north), Aldershot (9 miles north-east), Alton (5 miles west) and Petersfield (10 miles south).
Around Sleaford
We work in homes and buildings around The New Inn. For rail, the closest station is Bentley (Hampshire) station, roughly 3.2 miles north of the centre. A little further out are Chase Community Hospital (2.1 miles south). For a walk, there’s Deadwater Valley.
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Wipe condensation off the frames
- Walk round the house once a year and look at the joints
- Keep paint off silicone joints
- Keep jet washers away from the mastic
Most silicone sealants won’t take paint, so mention any painting plans before work begins. We can use a paintable sealant where that matters.
Water trapped behind a failed joint can start rot in timber frames and sills. Rotten timber needs a joiner, not a sealant, so early resealing is worth it.
Questions from Sleaford
Is Sleaford in your area for window mastic?
Yes. Our work covers London and the South East, and Sleaford is part of that. You can call 0345 464 0079 or email us and tell us what needs doing.
Do you cover smaller places like Sleaford?
Yes. Sleaford is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can tenants book the work?
We are happy to deal with the tenant, landlord or agent. Just make sure your landlord agrees.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can you get sealant to suit coloured frames?
Yes, we choose a colour to suit the frame. Grey and black frames get grey or black sealant, and wood-effect frames generally suit brown.
Will resealing my frames help with draughts?
Yes, where the draught is at the frame edge. We check where the draught is before we start.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. We can talk about working times when we quote.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you don’t need to watch us work.
Landlords, agents and businesses in Sleaford
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Why act early in Sleaford
A quick bead over the top of old mastic looks like an easy fix, but it will not grip old, dirty sealant. It peels before long, and water still gets in behind. The old mastic has to come out. Older cottages and farmhouses around Sleaford can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, call 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why us?
- Every job guaranteed for a year
- We leave the area clean and tidy
- Sealant colour chosen to suit
- Old sealant always removed completely
Read what affects the cost or customer reviews.
When it isn’t the sealant
We will always be straight with you, so here’s what new sealant will not do:
- Condensation trapped between the panes
- A door that needs adjusting, rehanging or new seals
- A sash or casement that will not close properly
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think.
What we seal
- Composite doors
- Timber windows & doors
- Patio & French doors
- uPVC windows
- Window sills
- Aluminium frames