Surrey · England
Farncombe Sand Mastic
We cover Farncombe for 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 every job guaranteed for a year.
- Crumbling sand mastic round a window
- Tired mastic found when preparing windows for paint
- Open joints round the window box
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. Our tips:
- Ask us before painting near the mastic
- Avoid patching sand mastic with silicone
- Look over the window mastic once a year
- Have rotten timber repaired before new mastic goes in
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
An open joint round the box lets weather through. Left, the gap tends to get bigger as more mastic falls out.
About our sand mastic in Farncombe
We renew sand mastic around sash windows and doors set in stone or brick. Out comes the old, loose mastic, the joint is prepared and new mastic is shaped by hand. Common call-outs are for gaps round a timber door in stone or brick and mastic that needs renewing before redecorating, across period & listed homes, timber door frames and stone surrounds.
Homes around Farncombe range from older properties to newer houses, and their windows range just as widely. The right sealant depends on the frame and on what it sits in.
A one-year guarantee comes as standard, so you are covered after we have gone.
- Location
- Farncombe (GU7)
- Region
- Surrey
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How it works
You don’t need to clear the whole room or building, just the space around the work. We protect the rest, and the work takes a few hours per window, depending on the condition of the joints for a typical job. In a smaller place like Farncombe, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- We look at the surrounds with you and agree the joints to renew.
- 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.
How to prepare
- Keep children and pets away from the work area
- Clear items away from the joints we’re working on
- Mention if the joints have been sealed before
Get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Related advice
Windows and doors in Farncombe
With historic houses such as Loseley Park (about 1.2 miles north) nearby, there’s older building stock in the area around Farncombe as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Schools such as Farncombe Church of England Infant School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. If you let a flat or house near Farncombe station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Farncombe is about 4 miles south-west of Guildford, in Surrey. Across the GU7 area, we cover sand mastic for homes and businesses. Our Surrey coverage runs to 395 places, Farncombe among them. You can also see our page for Crawley, about 19 miles away.
Work in GU7 is quoted and booked the same way as anywhere else. If you need sand mastic at a property on Station Road, Old Station Road and Walnut Tree Gardens or a nearby road, we can help. Nearby, we also carry out sand mastic in Godalming (1 mile south), Aaron's Hill (1 mile south-west), Busbridge (1 mile south), Upper Eashing (2 miles south-west) and Lower Eashing (2 miles west). We also work in nearby towns such as Guildford (4 miles north-east), Woking (8 miles north), Camberley (11 miles north-west), Farnham (8 miles west), Dorking (12 miles east) and Frimley (10 miles north-west).
Landmarks near Farncombe
In Farncombe, that means homes and buildings near Broadwater School, Farncombe Wood and The Freeholders pub. Farncombe has its own railway station: Farncombe station. Well-known places in the area include Charterhouse School Museum (0.6 miles west) and Guildford Castle (2.9 miles north-east). Open spaces near Farncombe include Frith Hill and Farncombe Wood.
What the job involves on each surface
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. The gap round it is pointed with sand mastic.
Landlords, agents and businesses in Farncombe
We work for landlords and agents as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
DIY sealant or a professional job?
If you do try it yourself, take your time over the 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.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
Places near Farncombe
Other services in Farncombe
Farncombe: your questions answered
Is Farncombe in your area for sand mastic?
Yes. We work across London and the South East, and Farncombe is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear quote.
Will you come out to Farncombe?
Yes. Farncombe is within the area we cover, which takes in towns, villages and rural addresses. 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?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
What does sand mastic cost?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote and we’ll talk you through it.
Do I need permission for sand mastic on a listed building?
Checking first is sensible. Your local planning authority can say if consent is needed for listed or conservation-area properties.
Do you have insurance?
Yes. Full insurance covers our work.
Do I have to be there?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Is sand mastic better than silicone for my windows?
We’ll talk it through with you. Sand mastic suits many period homes, and modern sealants suit newer frames.
Signs you need sand mastic in Farncombe
Timber swells and shrinks with the weather. That movement opens up the mastic joint over time.
Look out for any of the following:
- Mastic dropping out of the joint
- Open joints round the window box
- Mastic worn away on windows facing the weather
- A silicone bead on a sash window that spoils the look
If you live in an older home near St John the Evangelist Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Questions to ask before booking
- Who turns up on the day
- Which colour the sealant will be
- What preparation is included
- When the joint can take water or movement
Why act early in Farncombe
An open joint round the frame lets weather in. Left, water can reach the timber and the wall, so dealing with it now protects both. Around Farncombe, water from a failed joint in an older home can soak into timber and plaster, and that’s a much bigger job than renewing the sealant.
What you pay reflects the work, not guesswork. That is why we ask a few questions first and agree the price before starting.
Why Farncombe clients choose us
- Anti-fungal silicone where joints get wet
- Arbo and Everbuild products
- An ARBOMaster approved applicator
- Tidy, careful work
Take a look at how sealant jobs are priced or what customers say.