Hampshire · England
Bagmore Sand Mastic
Sand mastic in Bagmore from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Gaps between timber frames and stone or brick
- Cement or filler used on old window joints that has cracked
- Window mastic to renew ahead of painting
What we do, step by step
Once we are on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes anything from a few hours to a full day, depending on how many windows. For a village or hamlet like Bagmore, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- For business premises, tell us about site rules or sign-in
- Mention any leaks or damp you’ve noticed
How to get a quote
For sand mastic in Bagmore, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before we start.
Advice
Sand mastic for homes and businesses in Bagmore
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. Out comes the old, loose mastic, the joint is prepared and new mastic is shaped by hand. If you’re dealing with mastic round period door frames that has failed and silicone on a period window that looks wrong, we can help.
In a village or hamlet like Bagmore, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these do not always suit modern silicone, so the sealant has to be chosen to suit the building.
You get a 12-month guarantee, the same in Bagmore as everywhere else we work.
- Place
- Bagmore (RG25)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What sand mastic looks like in Bagmore
Historic houses like Hall Place (about 3 miles south) are a reminder that the area around Bagmore has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
Homes close to Church of St. Mary include some older properties, and the joint between an old wall and a newer frame is normally the first place rain gets in.
Bagmore is about 5 miles north-west of Alton, in Hampshire. Wherever you are in the RG25 postcode area, we cover sand mastic for homes and businesses. Across Hampshire, we cover 683 places, Bagmore among them. Our Reading page covers work nearby.
We work across RG25 for sand mastic. We also cover the places around Bagmore: Southrope (1 mile east), Burkham (1 mile south-west), Shalden Green (2 miles east), Bradley (3 miles south-west) and Bentworth (3 miles south). We also work in nearby towns such as Basingstoke (5 miles north-west), Winchester (15 miles south-west), Farnborough (14 miles north-east), Fleet (11 miles north-east), Aldershot (13 miles east) and Alton (5 miles south-east).
Local landmarks in Bagmore
The closest station to Bagmore is Alton station, roughly 4.9 miles south-east of the centre. Other landmarks nearby include Alton Community Hospital (4.9 miles south-east) and Gliding Heritage Centre (1.6 miles south-east). Open spaces near Bagmore include Farleigh Hill.
Landlords, agents and businesses in Bagmore
Failed sealant is one of the commonest items on a check-out report. Several properties can go on one quote.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Different surfaces, different methods
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. Sand mastic seals the joint round it.
FAQs for Bagmore
Do you cover smaller places like Bagmore?
Yes, Bagmore is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you work for landlords with property near Alton station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear price.
What’s sand mastic made of?
It’s sand mixed with a linseed-oil-based binder, used between timber frames and stone or brick.
Is it possible to paint over sand mastic?
It’s traditionally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
Can new sealant go over the old?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Are you fully insured?
Yes. We are fully insured, and we’ve been doing sealant work for more than 20 years.
What guarantee comes with the work?
Our 12-month guarantee covers every job, sand mastic included.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
What happens if it’s left?
Not every draught comes from the sashes themselves. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. Older cottages and farmhouses around Bagmore can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
The cost reflects the work involved, not guesswork. That is why we ask a few questions first.
Why choose Mr Mastic in Bagmore
- 12-month guarantee on every job
- Any old sealant cut out fully, not covered over
- Trusted Arbo and Everbuild sealants
- 20+ years of sealant experience
Read our cost guide and what customers say.
What else we do in Bagmore
Should I try it myself first?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Aftercare tips
Simple care keeps the joints in good condition. Our advice:
- Keep sills and gutters clear so water drains away
- Take care around the mastic when scraping paint
- Inspect the joints round the windows every year or so
- Check with your local planning authority if your home is listed
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens as more mastic falls out.
Signs you need sand mastic in Bagmore
Some old mastic was never deep enough. Mastic that’s too thin cracks and drops out so we make sure the new mastic is the right thickness.
Keep an eye out for these signs:
- Old cement repairs round a window that have failed
- Gaps where the frame meets the masonry
- Failed mastic on an exposed elevation
- Tired mastic found when preparing windows for paint
Letting a property close to Alton station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Questions to ask before you book
- How hidden problems are handled
- How the colour is chosen
- The length of the guarantee
- Whether all the old sealant comes out first