Surrey · England
Crondall Sand Mastic
Sand mastic across Crondall and nearby, with old sealant always removed completely and a 12-month guarantee.
- Gaps between timber frames and stone or brick
- Gaps round a timber door in stone or brick
- A silicone bead on a sash window that spoils the look
Can I do it myself?
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.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Sand mastic in Crondall
We work across Crondall renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand, finished to suit the masonry. If you have old cement repairs round a window that have failed and gaps where the frame meets the masonry, we can put it right, whatever the surface.
Somewhere as small as Crondall, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
Every job is covered by our one-year guarantee.
- Location
- Crondall (GU10)
- Wider area
- Surrey
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What happens on the day
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take anything from a few hours to a full day, depending on how many windows. Somewhere like Crondall needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The finish is dressed so it sits neatly against the stone or brick.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Try not to wet indoor joints just before the visit
- Tell us about any water getting in
Ask for a quote
Every job is quoted individually, so start by telling us what you need. Just phone 0345 464 0079 or send us an email with the details.
Read more
How we quote for sand mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- Any working-time requirements on site
- Mould in or behind the old joints
- The amount of work
- The product the joint needs
We don’t show prices on the website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or drop us an email and we’ll talk you through it.
Helping us quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- A few pictures by email, if you can
- What’s wrong with the joints now
- How we’d reach the joints
- If it’s domestic, commercial or a hotel
We don’t publish a price list. Instead, we send you a clear quote for your job. To get started, ring 0345 464 0079 or email us.
Landlords, agents and businesses in Crondall
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will quote.
Sand mastic in Crondall: local notes
With historic houses such as Farnham Castle (about 2.7 miles east) nearby, there’s older building stock in the area around Crondall as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to Church of All Saints include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Letting a property close to Farnham station? Then any sash windows need sound mastic to keep draughts and rain out.
Crondall is about 3 miles south of Fleet, in Surrey. We provide sand mastic to householders, landlords and businesses in Crondall and the surrounding area. We cover 395 towns and villages across Surrey, large and small. For nearby work, see our Reading page (16 miles or so).
Every address in GU10 is covered for sand mastic, from the main roads to the quietest streets. Local streets include Church Street, The Borough and Glebe Road, and we cover them all. Nearby, we also carry out sand mastic in Redlands (1 mile north-east), Bowling Alley (1 mile north), Dora's Green (1 mile east), Warren Corner (1 mile east) and Mill Lane (1 mile north). Further out, we also cover Guildford (12 miles east), Woking (14 miles north-east), Camberley (9 miles north-east), Farnham (3 miles south-east), Frimley (8 miles north-east) and Haslemere (12 miles south-east).
Landmarks near Crondall
Typical jobs here are in homes near The Plume Of Feathers Public House and St Nicholas' School. The closest station to Crondall is Farnham station, about 3.3 miles south-east of the centre. Other landmarks nearby include Museum of Farnham (2.8 miles south-east) and Hart Shopping Centre (3.4 miles north). Not far away are Beacon Hill and Aunt's Pool.
Why act early in Crondall
Not every filler suits an old window surround. Sand mastic matches what was there and that can be important for listed homes. Where a wall is exposed, as many are in small places like Crondall, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
The cost reflects the work involved, not a rough estimate. That’s why we ask about the job first and agree the price before starting.
Why book with us
- Over 20 years’ experience
- 4.9 on Google from 180+ five-star reviews
- Sanitary silicone with an anti-fungal additive in wet areas
- Old sealant always removed completely
Also near Crondall
What else we do in Crondall
Different surfaces, different methods
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. We shape it by hand to follow the stone.
Sash and case windows
On a sash window, the mastic joint shows on the outside so we finish it carefully.
Crondall: your questions answered
Is Crondall in your area for sand mastic?
Yes, Crondall is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Do you cover smaller places like Crondall?
Yes. Crondall is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Can new sealant go over the old?
No, it will not last. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Where are you based?
Mr Mastic is based in Crawley. We cover Crondall and the rest of Surrey.
Do you work for letting agents?
Yes, regularly. Several properties can go on one quote, and between tenancies is a good time for the work.
Can sand mastic be painted?
The usual advice is to leave sand mastic unpainted. Ask us before you decorate around it and we’ll talk you through it.
Is the work guaranteed?
Our 12-month guarantee covers every job.
Common problems we fix in Crondall
Scraping and sanding before painting can loosen old mastic. Many people find it crumbling when they prepare the windows.
These are the problems we are asked about most:
- Weathered mastic on the most exposed windows
- Patchy fillers round a sash window
- Wind and rain getting in round a sash window
- Open joints round the window box
For site and facilities teams at buildings such as Crondall Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
What to look for in a quote
- What the cure time is
- What product goes in the joint
- What preparation is included
- How the colour is chosen