Surrey · England
Sand mastic for sash & case windows in Runfold, Surrey
Our applicators work in Runfold on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Failed mastic on an exposed elevation
- Modern sealant on a period surround
- Gaps round a timber door in stone or brick
Sand mastic in Runfold, done properly
Fresh sand mastic forms a skin quite soon but full hardening takes longer. Traditional guidance is not to paint over it and we’ll advise if you’re redecorating. Typical jobs include gaps round a timber door in stone or brick and failed mastic on an exposed elevation, on period & listed homes, timber door frames and tenement windows.
Mastic can only go onto a dry, clean joint, so window work in Runfold is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
Every job is covered by our 12-month guarantee.
- Place
- Runfold (GU10, GU9)
- Region
- Surrey
- Cover
- One year on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How the job changes by surface
Sash and case windows
The mastic round a sash window is on show, so a neat, even finish matters.
Tenement and terrace windows
Upper-floor windows need access planning. Tell us the height and we’ll confirm what’s needed.
What we are called out for in Runfold
Paint, silicone or cement used over old mastic causes problems. They do not suit the joint and we normally remove them.
It’s worth asking for a quote if you see:
- Gaps between timber frames and stone or brick
- Draughty sash windows at the surround
- Old cement repairs round a window that have failed
- Weathered mastic on the most exposed windows
For landlords with property near Farnham station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Comparing quotes
- Whether the sealant suits the joint
- How long the guarantee is
- Is the old sealant removed completely?
- Are they insured?
Leave it or put it right?
Silicone might seem the quicker option, but it can look wrong on a period surround. Sand mastic suits the building and finishes neatly against the masonry. Where a wall is exposed, as many are in small places like Runfold, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
The cost depends on how much there is to do, how much old material has to come out and access to the work. We give a clear quote before any work starts.
Why us?
- 180+ five-star Google reviews
- Sanitary silicone with an anti-fungal additive in wet areas
- Homes, businesses and hotels
- Approved under the ARBOMaster scheme
Read what affects the cost or our reviews.
How the visit works
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes a few hours per window, depending on the condition of the joints. For a village or hamlet like Runfold, 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.
- First, we look at the surrounds with you and agree what needs doing.
- Old, loose mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Getting ready for the visit
- Mention any parking rules near the property
- Clear items away from the joints we’re working on
- Let us know about earlier repairs to the joints
Ask for 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 explain how we’d tackle it. When it suits you, phone 0345 464 0079 or send us an email.
Related advice
Questions from Runfold
Can you help a landlord with a rental near Farnham station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear quote.
Do you cover smaller places like Runfold?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Will there be a smell?
Some sealants have a smell while they cure, which fades as it sets. Opening a window helps.
Is it possible to paint over sand mastic?
The usual advice is to leave sand mastic unpainted. If you are redecorating the window, ask us first and we will talk you through it.
Where is Mr Mastic based?
Our base is Crawley. We work across South East England, London and Scotland.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we will quote it together.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. We can talk about working times when we quote.
Should I check with the council before work on a listed or conservation-area home?
Your local planning authority is the one to ask. They decide whether consent is needed for work to your windows.
What sand mastic looks like in Runfold
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Farnham Castle (about 2.2 miles west) nearby, there’s older building stock in the area around Runfold as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
If you live in an older home near The Church of the Good Shepherd, the joint between an old wall and a newer frame is generally the first place rain gets in. Managing a site like South Farnham School? Then its window and door frames need their mastic kept sound, just like a home’s.
Runfold is about 2 miles east of Farnham, in Surrey. Homes, rented property, offices and hotels in Runfold can book us for sand mastic, old or new, large or small. Every job comes with our one-year guarantee. Our Surrey coverage runs to 395 places, and Runfold is one of them. You can also see our page for Reading, about 19 miles away.
Postcode districts we cover here for sand mastic: GU10 and GU9. That includes homes and businesses on Greenacres, Crooksbury Road and Compton Way. We also cover Compton (1 mile west), The Sands (1 mile east), Sandy Cross (1 mile north-east), Badshot Lea (1 mile north) and Seale (2 miles north-east). Further out, we also cover Guildford (8 miles east), Woking (11 miles north-east), Camberley (9 miles north), Frimley (7 miles north), Haslemere (9 miles south) and Cranleigh (13 miles east).
Around Runfold
Around Runfold, our work takes us to homes and buildings near Crooksbury Hill and the streets around them. The nearest railway station is Farnham station, roughly 1.7 miles west of the centre. Other landmarks nearby include Farnham Castle (2.2 miles west) and Museum of Farnham (2.2 miles west). Not far away are Culverswell Hill and Aunt's Pool.
Should I try it myself first?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Looking after it afterwards
Simple care keeps the joints in good condition. Our advice:
- Make sure water runs off the sill
- Go gently near the mastic when preparing windows
- Ask us before painting near the mastic
- Get any rot dealt with first
When preparing windows for paint, take care around the mastic. Hard scraping can loosen it.
Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.
Towns and villages near Runfold
Also in Runfold
When it isn’t the sealant
New sealant cannot fix everything, and we’d rather say so up front. It will not solve:
- Cracked or broken glass
- Sashes that need overhauling
- Damaged stone surrounds
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly before you book.
Surfaces we seal
- Brick reveals
- Tenement windows
- Stone surrounds
- Period & listed homes
- Timber door frames
- Sash and case windows