Surrey · England
Sand mastic for sash & case windows in Boundstone, Surrey
Our applicators work in Boundstone on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and a 12-month guarantee.
- Patchy fillers round a sash window
- Gaps between timber frames and stone or brick
- Draughts and rain around sash boxes
Sand mastic in Boundstone
Traditional burnt sand mastic that sits naturally against stone and brick. It suits period and listed homes where a modern sealant bead would stand out. We’re often asked to deal with old sand mastic that has cracked, crumbled or fallen out and modern sealant on a period surround, on stone surrounds, period & listed homes and timber door frames.
Houses in smaller places like Boundstone can stand more in the open than those in a built-up town. The mastic around frames on those walls tends to age faster.
There’s a 12-month guarantee on every job.
- Location
- Boundstone (GU10)
- Region
- Surrey
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Landlord and commercial work in Boundstone
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
How the visit works
There isn’t much for you to do on the day. Show us the job and we will take it from there. The job generally takes a few hours per window, depending on the condition of the joints, including the tidy-up. Parking around Boundstone is usually easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Keep children and pets away from the work area
- On commercial sites, let us know about site rules
- Mention any parking rules near the property
How to get a quote
For a quote, phone 0345 464 0079 or send us an email with the location and a short description of the problem. We will give you a clear price before any work starts.
Read more
Surface by surface
Timber door frames
Door frames get knocked and soaked, so their mastic can fail sooner. It’s renewed by hand.
Stone surrounds
Stone surrounds suit sand mastic well. The finish blends with the masonry.
What sealant work can’t fix
Some problems need a builder, plumber or other trade rather than us:
- Planning or listed building consent (your local planning authority decides)
- Putty and glazing repairs
- Crumbling stone or brickwork round the window
If in doubt, ring 0345 464 0079 or send us an email and we will say what we think.
What we seal
- Stone surrounds
- Timber door frames
- Sash and case windows
- Period & listed homes
- Brick reveals
- Tenement windows
Also near Boundstone
Also in Boundstone
Boundstone: your questions answered
Do you cover smaller places like Boundstone?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
I let a flat near Farnham station. Can you help?
Yes, rental work is part of what we do. You can call 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before work begins.
What guarantee comes with the work?
There’s a 12-month guarantee on every job.
How much does sand mastic cost in Boundstone?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You will get a clear quote before work begins.
Can you replace silicone on a period window with sand mastic?
Yes, we do this often. The old silicone has to come out completely so the mastic can sit properly.
Which is right for my windows, sand mastic or modern sealant?
Sand mastic normally suits period timber windows best. Modern frames normally suit a flexible sealant, and we will explain why.
Do I need permission for sand mastic on a listed building?
Your local planning authority is the one to ask. They decide whether consent is needed for work to your windows.
Can I paint the new mastic?
It’s traditionally left unpainted, as guidance on traditional windows advises. Talk to us before any painting near it.
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so just mention it when you contact us.
If you’re 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 fails, we can still redo it.
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Avoid heavy scraping on the mastic joint
- Keep sills and gutters clear so water drains away
- Don’t paint over the new mastic
- Look over the window mastic once a year
Do not touch or press the mastic while it hardens. It skins over quickly, but takes longer to harden fully.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
Sand mastic in Boundstone: local notes
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. Historic houses like Farnham Castle (about 2 miles north) are a reminder that the area around Boundstone has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
For landlords with property near Farnham station, any sash windows need sound mastic to keep draughts and rain out. Homes close to St Timothy include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Schools such as St Peter's CofE Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Boundstone is about 2 miles south-west of Farnham, in Surrey. Jobs in Boundstone get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. 395 places in Surrey are on our list, from the larger towns to small villages. We also work in Reading, about 19 miles from Boundstone.
Postcode districts we cover here for sand mastic: GU10. That includes homes and businesses on Jubilee Lane, Vine Way and Vine Lane and the roads around them. Neighbouring places we cover for sand mastic include Shortheath (1 mile north), Wrecclesham (1 mile north-west), Rowledge (1 mile south-west), Holt Pound (1 mile west) and Batt's Corner (2 miles south-west). Larger places within reach include Guildford (11 miles east), Woking (13 miles north-east), Camberley (11 miles north), Frimley (9 miles north), Haslemere (8 miles south-east) and Cranleigh (15 miles east).
Around Boundstone
In Boundstone, that means homes and buildings near Edgeborough School, Weydon School and Underdown nature reserve and the streets around them. The nearest railway station is Farnham station, about 1.7 miles north-east. A little further out are Farnham Castle (2 miles north) and Museum of Farnham (1.6 miles north). Open spaces near Boundstone include Culverswell Hill and Farnham Heath.
Why deal with it now?
A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic is the traditional material and finishes neatly against the masonry. Homes in smaller places like Boundstone can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why Boundstone customers choose us
- We never seal over old sealant
- Experience in homes, commercial sites and hotels
- More than 20 years in sealant work
- 4.9 on Google from 180+ five-star reviews
Read how sealant jobs are priced or our reviews.