Hampshire · England
Sand mastic for sash & case windows in Frogmore, Hampshire
Window and door surrounds in Frogmore need attention? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Mastic dropping out of the joint
- Cracked mastic round a front door frame
- Draughty sash windows at the surround
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Make sure water runs off the sill
- Ask the planning authority about consent for listed or conservation-area homes
- Avoid patching sand mastic with silicone
- Go gently near the mastic when preparing windows
Don’t touch or press the mastic while it hardens. It forms a skin fairly soon, but takes longer to harden fully.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
Sand mastic in Frogmore
We work across Frogmore renewing sand mastic on sash windows and doors. Every joint is cleaned out and filled by hand for a neat, traditional finish. If you are dealing with silicone on a period window that looks wrong and draughts and rain around sash boxes, we can help, on timber door frames, brick reveals and sash and case windows alike.
In a smaller place like Frogmore, some walls face open ground and catch the full force of the weather, so exposed windows and doors face the weather head on. The mastic around frames on those walls tends to age faster.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Place
- Frogmore (GU17, GU47, GU46)
- Region
- Hampshire
- Cover
- A year, on every job
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY versus a professional finish
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Nearby places to Frogmore
What else we do in Frogmore
Questions from Frogmore
Will you come out to Frogmore?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can you help a landlord with a rental near Sandhurst station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint.
What’s sand mastic made of?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
Will it make a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Should I use sand mastic or silicone?
For period timber windows in stone or brick, sand mastic is often the better fit. Modern frames normally suit a flexible sealant, and we’ll explain why.
Is it possible to take out silicone and use sand mastic instead?
In most cases. The silicone is cut out and the joint cleaned, then point it with sand mastic.
Landlords, agents and businesses in Frogmore
If you manage several properties in or around Frogmore, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
What we do, step by step
You do not need to clear the whole room or building, just the space around the work. We protect the rest, and the job takes a few hours per window, depending on the condition of the joints in most cases. A visit to Frogmore is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First, we look at the surrounds with you and agree what needs doing.
- We rake out the old mastic and clean the joint.
- Deep voids are packed so the mastic is the right thickness.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Preparing for the visit
- Tell us if parking is tricky
- Mention if the joints have been sealed before
- On commercial sites, let us know about site rules
How to get a quote
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
Related advice
Windows and doors in Frogmore
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Letting a property close to Sandhurst station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. Schools such as Frogmore Junior School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. Homes close to St Barnabas Church include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Frogmore is about 1 mile south-west of Sandhurst, in Hampshire. Anywhere in GU17, our applicators can take on sand mastic. Our Hampshire coverage runs to 683 places, Frogmore among them. Reading is on our list too, around 11 miles away.
Every address in GU17, GU47 and GU46 is covered for sand mastic, from the main roads to the quietest streets. We cover properties on Bell Lane, Green Lane and Reading Road. Other places close to Frogmore include Blackwater (1 mile east), Hawley (1 mile south-east), College Town (1 mile north-east), Sandhurst (1 mile north-east) and York Town (2 miles east). We also work in nearby towns such as Basingstoke (14 miles west), Farnborough (3 miles south-east), Fleet (5 miles south-west), Aldershot (6 miles south), Alton (15 miles south-west) and Tadley (15 miles west).
Near you in Frogmore
Around Frogmore, our work takes us to homes and buildings near White Swan pub, Frogmore Community College and Sandhurst Memorial Park and the streets around them. The nearest railway station is Sandhurst station, about 0.8 miles north. A little further out are Staff College Museum (2.1 miles east) and Frimley Park Hospital (2.6 miles south-east). Not far away are Horseshoe Lake and Wildmoor Heath.
What happens if it’s left?
An open joint round the frame lets weather in. Left, water can reach the timber and the wall so renewing it early protects the window. In an older home around Frogmore, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
What you pay reflects the work, not guesswork. That’s why we ask a few questions first and agree the price before starting.
Why Frogmore clients choose us
- 4.9 on Google from 180+ five-star reviews
- 20+ years of sealant experience
- Homes, businesses and hotels
- Arbo and Everbuild products
Take a look at how sealant jobs are priced or what customers say.
When something else is needed
New sealant cannot fix everything, and we’ll tell you before work begins. Sealant will not put right:
- Masonry that needs repairing
- Planning or listed building consent (your local planning authority decides)
- Broken panes
If you’re not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer.
Surfaces we seal
- Sash and case windows
- Stone surrounds
- Period & listed homes
- Tenement windows
- Brick reveals
- Timber door frames
What the job involves on each surface
Stone surrounds
The stone is treated with care when the old mastic comes out.
Timber door frames
Door frames get knocked and soaked and the mastic can crack early. We rake it out and renew it.