Hampshire · England
Sand mastic for sash & case windows in Sleaford, Hampshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Sleaford and across Hampshire. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Mastic dropping out of the joint
- Gaps round a timber door in stone or brick
- Mastic that needs renewing before redecorating
Sand mastic in Sleaford
We renew sand mastic around sash windows and doors in stone and brick. The old mastic is raked out, and new mastic is applied and shaped by hand. Common call-outs are for open joints round the window box and old sand mastic that has cracked, crumbled or fallen out, across sash and case windows, period & listed homes and brick reveals.
Somewhere as small as Sleaford, older homes often have timber frames set in stone or brickwork. Older buildings like these don’t always suit modern silicone, so the sealant has to be chosen to suit the building.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Where
- Sleaford (GU35)
- Wider area
- Hampshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the cost of sand mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- The number and length of the joints
- Whether old sealant or filler has to be cut out
- Which sealant suits the joint
- Mould in or behind the old joints
Combining jobs into one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. We’ll give you a clear price for the lot.
Helping us quote
When you call or email, it’s useful to know:
- The type of property
- Roughly how big the job is
- Access, such as stairs, a lift or height
- The problem you’ve noticed
To get a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. You will have a clear quote before we start.
Other services in Sleaford
Landlords, agents and businesses in Sleaford
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together.
Landlords and letting agents in Sleaford can book us as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
Questions from Sleaford
Can you do sand mastic in Sleaford?
Yes. We work across London and the South East, and Sleaford is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job.
Will you come out to 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. Just mention lanes, gates or anything else about the route when you book.
Is it possible to paint over sand mastic?
It’s traditionally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
Are you fully insured?
Yes, we’re fully insured for domestic and commercial work.
What do you need from me for a quote?
A short description and the location, with photos by email if possible. If we need more, we’ll ask.
Is it possible to take out silicone and use sand mastic instead?
Yes, it’s a common request. The old silicone has to come out completely so the mastic can sit properly.
Is there any odour?
Some sealants have a smell while they cure, but it fades. Ventilation helps.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
How it works
There is not much for you to do on the day. Show us the job and we’ll take it from there. The work itself takes a few hours for a single window, longer for several from start to finish. 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.
- We check the window surrounds and agree which joints need renewing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- We dress the surface so it sits neatly against the masonry.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Let us know about stairs, lifts or work at height
- Move anything stored near the joints
How to get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. When it suits you, call 0345 464 0079 or email us.
Advice
What the job involves on each surface
Sash and case windows
The mastic round a sash window is on show, so a neat, even finish matters.
Brick reveals
Loose mastic comes out and deep gaps are packed before pointing.
Windows and doors in Sleaford
Rainfall in the South East is lower than in much 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 All Saints, frames set in older brick or stone need a sealant that suits the wall as well as the frame. For landlords with property near Bentley (Hampshire) station, cracked sand mastic around sash windows lets in the draughts tenants complain about. If you look after a building such as Mill Chase Academy, its window and door frames need their mastic kept sound, just like a home’s.
Sleaford is about 5 miles east of Alton, in Hampshire. Our applicators cover sand mastic for homeowners, landlords and businesses in Sleaford and the surrounding area, as part of our work across Hampshire. 683 places in Hampshire are on our list, from the larger towns to small villages. We also work in Reading, around 22 miles away.
Jobs for sand mastic in GU35 works the same way as everywhere else we cover. Other places close to Sleaford include Kingsley (1 mile west), Pinewood Village (1 mile south), Lindford (1 mile south), Frithend (1 mile north) and Bordon (2 miles south). We also work in nearby towns such as 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).
Near you in Sleaford
Typical jobs here are in homes near The New Inn. The closest station to Sleaford is Bentley (Hampshire) station, about 3.2 miles north. Other landmarks nearby include Chase Community Hospital (2.1 miles south). For a walk, there’s Deadwater Valley.
Leave it or put it right?
An open joint round the frame lets weather in. Left, water can reach the timber and the wall, so dealing with it now protects both. In a small place like Sleaford, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Why us?
- Neat joints and a tidy finish
- 20+ years of sealant experience
- One-year guarantee on every job
- We are fully insured
Read what affects the cost or what customers say.
Honest limits
We will always be straight with you, so here’s what sealant cannot fix:
- Masonry that needs repairing
- Sash cords, weights and draught-proofing of the sashes
- Cracked or broken glass
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly.
What we seal
- Period & listed homes
- Sash and case windows
- Tenement windows
- Stone surrounds
- Brick reveals
- Timber door frames
Aftercare tips
Good habits help new joints last longer. Our tips:
- Look over the window mastic once a year
- Make sure water runs off the sill
- Leave the new mastic unpainted
- Avoid patching sand mastic with silicone
Leave the new mastic alone while it firms up. It forms a skin fairly soon, but takes longer to harden fully.
Sound mastic protects the frame. Failed mastic lets water reach the timber, which can lead to rot.