Hampshire · England
Sand mastic for sash & case windows in Nether Wallop, Hampshire
Problem with your window and door surrounds in Nether Wallop? We remove the old material, prepare the joints and seal them properly.
- Gaps round a timber door in stone or brick
- Patchy fillers round a sash window
- Mastic that needs renewing before redecorating
About our sand mastic in Nether Wallop
A silicone bead around a sash window can look out of place and is not always the right material. Sand mastic gives a finish that matches the age of the house, and we can replace one with the other. We work on period & listed homes, tenement windows and stone surrounds, and people most often call us about cement or filler used on old window joints that has cracked and draughts and rain around sash boxes.
Homes in small places like Nether Wallop often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
Whatever the size of the job, you get the same 12-month guarantee in Nether Wallop and across Hampshire.
- Location
- Nether Wallop (SO20)
- Region
- Hampshire
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Hotels need rooms back in use, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.
Towns and villages near Nether Wallop
What else we do in Nether Wallop
Nether Wallop questions
I let a flat near Grateley station. Can you help?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can go on one quote. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Do you cover Nether Wallop for sand mastic?
Yes, Nether Wallop is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear price.
Are you fully insured?
Yes. We are fully insured.
Do the sealants smell?
Possibly a little. It fades as the sealant cures, and ventilation helps.
Is it OK to seal over old sealant?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
What guarantee comes with the work?
There’s a 12-month guarantee on every job.
Should I check with the council before work on a listed or conservation-area home?
Speak to your local planning authority before work starts. Like-for-like sand mastic is often the preferred finish but the decision is theirs.
When will the new mastic be hard?
It takes a while. The skin forms first, and the full set comes later and we will give you an idea for your job.
Why deal with it now?
An open joint round the frame lets weather in. Water can get to the frame and the masonry, so dealing with it now protects both. Around Nether Wallop, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
What you get with us
- Any old sealant cut out fully, not covered over
- One-year guarantee on every job
- We’re fully insured
- Approved under the ARBOMaster scheme
Read how sealant jobs are priced and customer reviews.
Looking after it afterwards
Simple care keeps the joints in good condition. We recommend:
- Clear gutters so water doesn’t pour onto the windows
- Ask us before painting near the mastic
- Sort the mastic before the decorators arrive
- Keep modern sealant off the mastic
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
Should I try it myself first?
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 doesn’t work out, we can still put it right.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
The process
Once we are on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take anything from a few hours to a full day, depending on how many windows. Somewhere as small as Nether Wallop, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Let us know about earlier repairs to the joints
- Try not to wet indoor joints just before the visit
- Keep children and pets away from the work area
Get a quote
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we will explain what’s involved.
Read more
What affects the quote in Nether Wallop
We do not publish a price list, because jobs vary so much. What we look at:
- Whether old sealant or filler has to be cut out
- The amount of work
- Which sealant suits the joint
- Any working-time requirements on site
The cost depends on the size of the job, how much old material has to come out and access to the work. You will have a clear quote before any work starts.
What we need to know
There’s no need for technical detail. It helps if you can tell us:
- Roughly how big the job is
- Any previous sealing or DIY work
- Photos by email, if that’s easy
- How we’d reach the joints
Quotes start with a quick conversation. 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, phone 0345 464 0079 or drop us an email.
Different surfaces, different methods
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
Tenement and terrace windows
Upper-floor windows need access planning. Let us know the floor and we will confirm access.
What sand mastic looks like in Nether Wallop
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.
For site and facilities teams at buildings such as Wallop Primary School, larger buildings have plenty of frames, and the mastic around each one ages. For landlords with property near Grateley station, older sash windows in a rental need their mastic kept sound to keep the weather out. For an older house near a landmark such as Church of St Andrew, the joint between an old wall and a newer frame is generally the first place rain gets in.
Nether Wallop is about 7 miles south-west of Andover, in Hampshire. Every kind of property in Nether Wallop can book us for sand mastic, old or new, large or small. The work is guaranteed for a year. Nether Wallop is one of 683 places in Hampshire where we work for sand mastic. We also work in Southampton, about 16 miles from Nether Wallop.
We work across SO20 for sand mastic and the streets around it. Whether your property is on Church Road, High Street and Church Hill or anywhere close by, our applicators can take on the job. If you’re just outside Nether Wallop, we cover Middle Wallop (1 mile north-west), Over Wallop (2 miles north-west), Kentsboro (2 miles north), Red Rice (4 miles north-east) and Fox (4 miles north). Within a short drive, we also cover Winchester (12 miles south-east), Eastleigh (15 miles south-east), Andover (7 miles north-east), Totton (15 miles south), Chandler's Ford (13 miles south-east) and Romsey (10 miles south).
Around Nether Wallop
We work in homes and buildings around The Old Butchers Arms and the streets around them. Nether Wallop’s nearest station is Grateley station, roughly 3.8 miles north-west. The countryside around Nether Wallop includes Boscombe Down East.