Hampshire · England
Sand mastic for sash & case windows in Farnborough, Hampshire
Professional sand mastic in and around Farnborough, with old sealant always removed completely and a 12-month guarantee.
- Cement or filler used on old window joints that has cracked
- Silicone on a period window that looks wrong
- Old sand mastic that has cracked, crumbled or fallen out
Sand mastic for homes and businesses in Farnborough
Traditional burnt sand mastic blends with stone and brick surrounds. It’s a good fit for period properties, where modern sealant can look out of place. We work on tenement windows, stone surrounds and sash and case windows, and people most often call us about old sand mastic that has cracked, crumbled or fallen out and draughty sash windows at the surround.
Around Farnborough, many houses have gained conservatories, French doors or replacement windows over time. Every addition brings more joints, each wearing at its own pace. Leaks generally start at a sill, a frame head or a glazing joint.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we’ll put it right.
- Where
- Farnborough (GU14, GU11, GU17)
- Wider area
- Hampshire
- Cover
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Honest limits
New sealant cannot fix everything, and we’d rather say so up front. Sealant will not put right:
- Sash cords, weights and draught-proofing of the sashes
- Damaged stone surrounds
- Rotten sashes, sills or window boxes (a joiner’s job)
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think before booking.
What we seal
- Period & listed homes
- Brick reveals
- Timber door frames
- Tenement windows
- Sash and case windows
- Stone surrounds
Nearby places to Farnborough
Also in Farnborough
Sand mastic in Farnborough: local notes
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.
For site and facilities teams at buildings such as Tower Hill Primary School, the mastic around its windows and doors needs looking after like any other building’s. If you let a flat or house near Farnborough Main station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Farnborough is about 31 miles south-west of City of Westminster, in Hampshire. From the centre of Farnborough to the outskirts, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. 683 places in Hampshire are on our list, from the larger towns to small villages. Reading is on our list too, around 14 miles away.
Our applicators cover all of the GU14, GU11 and GU17 postcode area for sand mastic and the streets around it. If you need sand mastic at a property on Wallis Square, Church Road West and Longleat Square or a nearby road, our applicators can take on the job. With the A325 and A327 close by, Farnborough is simple for us to get to for sand mastic. Other places close to Farnborough include Cove (1 mile west), North Camp (1 mile south-east), Southwood (1 mile west), Mytchett (2 miles east) and Ash Vale (3 miles south-east). We also work in nearby towns such as Basingstoke (15 miles west), Fleet (3 miles south-west), Alton (13 miles south-west), Yateley (4 miles north-west), Bordon (13 miles south) and Hook (8 miles west). As one of the bigger places in Hampshire, Farnborough has homes, rented property and businesses of every kind.
Near you in Farnborough
We work in homes and buildings around The Tilly Shilling pub, Henry Tyndale School and Snaky Lane Community Wildlife Area and the streets around them. Nearby too are National Aerospace Library (0.8 miles south-east) and Cove School (0.6 miles north-west). Farnborough’s nearest station is Farnborough Main station, about 0.5 miles east of the centre. A little further out are Frimley Park Hospital (2 miles north-east) and Hart Shopping Centre (3.3 miles west). Open spaces near Farnborough include Aunt's Pool and Ball Hill.
Your questions about sand mastic in Farnborough
Do you work for landlords with property near Farnborough Main station?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or email us with the details for a clear quote.
Is sand mastic in Farnborough guaranteed?
All our work, in Farnborough and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
Can you seal over the old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
How long does the job take?
Typically it takes a few hours for a single window, longer for several. Larger jobs naturally take longer, and we’ll tell you how long to expect.
What do you need from me for a quote?
Let us know what needs doing and where, plus pictures if you have them. If we need more, we will ask.
Can I add another job to the visit?
Yes. Several rooms, windows or areas can go on one quote.
What does sand mastic cost?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
How the job changes by surface
Stone surrounds
Stone openings are rarely perfectly straight, so the joint varies in width. Sand mastic is shaped by hand to suit.
Tenement and terrace windows
Windows above ground floor need the right access. Tell us the height and we will confirm what’s needed.
The process
When we arrive, we start by going over the job with you. Surfaces next to the work are protected before we start. The work usually takes a few hours for a single window, longer for several. For a job in Farnborough, we need access to where the work is and somewhere nearby to park. For outside work, let us know about side access, gates and any upper-floor joints.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The mastic is finished to sit tidily against the stone or brick.
How to prepare
- Clear the area around the work
- Let us know if you’ve seen damp or leaks
- Where the joints are inside, avoid wetting them before we arrive
Get a quote
Want a quote for sand mastic? Please phone 0345 464 0079 or drop us an email with a few details. We’ll explain what we’d do and give you a clear quote before work begins.
Advice
Common problems we fix in Farnborough
Age is the main cause. Sand mastic is a maintenance item like any pointing, depending on exposure and upkeep.
Keep an eye out for any of the following:
- Gaps where the frame meets the masonry
- Old sand mastic that has cracked, crumbled or fallen out
- Tired mastic found when preparing windows for paint
- Old cement repairs round a window that have failed
If you live in an older home near Church of St Christopher, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Comparing quotes
- Whether the sealant suits the joint
- Which colour the sealant will be
- How the surfaces are prepared before sealing
- The length of the guarantee
Can I do it myself?
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Ask the planning authority about consent for listed or conservation-area homes
- Plan mastic work ahead of painting
- Make sure water runs off the sill
- Get any rot dealt with first
Do not touch or press the mastic while it hardens. It skins over quickly, but takes longer to harden fully.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
Quotes for sand mastic in Farnborough
Call for a quick quote. What matters most is:
- Which sealant suits the joint
- Working hours on commercial sites
- How many rooms, windows or areas are involved
- Whether the work is at height
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
What we need to know
To make quoting easier, let us know:
- Any previous sealing or DIY work
- What the problem is, such as mould, gaps, leaks or cracking
- Pictures of the joints, sent by email
- If it’s domestic, commercial or a hotel
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or send us an email.