Surrey · England
Sand mastic for sash & case windows in Bentley, Surrey
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Bentley and across Surrey. Fully insured, ARBOMaster approved and guaranteed for a year.
- Crumbling sand mastic round a window
- Window mastic to renew ahead of painting
- Weathered mastic on the most exposed windows
Sand mastic in Bentley
Sand mastic suits most period window surrounds. Newer frames generally get a flexible sealant instead and we’ll explain which is best for yours. We work on tenement windows, stone surrounds and period & listed homes, and common reasons people get in touch are patchy fillers round a sash window and a silicone bead on a sash window that spoils the look.
Outdoor sealant needs dry, clean surfaces, so work on frames around Bentley is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Whatever the size of the job, you get the same 12-month guarantee.
- Where
- Bentley (GU10, GU34)
- Region
- Surrey
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Looking after it afterwards
To keep the joints looking good and working properly:
- Find out about consent before window work on a listed home
- Avoid patching sand mastic with silicone
- Don’t paint over the new mastic
- Ask a joiner to look at soft timber first
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
Sound mastic protects the frame. Once it fails, water can sit against the timber, which can lead to rot.
Nearby places to Bentley
What else we do in Bentley
Common questions in Bentley
Do you cover Bentley for sand mastic?
Yes. We work across London and the South East, and Bentley is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we’ll send you a clear quote.
Do you work for landlords with property near Bentley (Hampshire) station?
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 we start.
Do you have insurance?
Yes. Mr Mastic is fully insured.
What sealant do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we will tell you what we are using.
How long does the job take?
As a guide, most jobs take a few hours for a single window, longer for several. Larger jobs naturally take longer.
Is there any odour?
Possibly a little. Any smell clears as the sealant cures.
What guarantee comes with the work?
Every job comes with our one-year guarantee, and we’re fully insured.
Can you match the sealant colour?
We’ll suggest a colour to suit the surroundings, from white and clear to greys and other shades. The product needed can limit the range.
What we do, step by step
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, carry out the job and tidy away. It normally takes anything from a few hours to a full day, depending on how many windows. In a small place like Bentley, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by checking each surround and agreeing the joints to renew.
- We rake out the old mastic and clean the joint.
- We pack any deep gaps so the mastic sits at the right depth.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Before we arrive
- Let us know if you’ve seen damp or leaks
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we will explain what’s involved before giving you a price.
Read more
What happens if it’s left?
Replacing sash windows is a big decision for a period home and on a listed home, consent may be needed. Where the frames are in good order, new mastic seals the surround. Older cottages and farmhouses around Bentley can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference.
Why Bentley customers choose us
- Domestic, commercial and hotel work
- We leave the area clean and tidy
- Anti-fungal silicone where joints get wet
- 12-month guarantee on every job
See what affects the cost or our reviews.
Should I try it myself first?
If you’ve already had a go yourself, that is fine. We cut it out and start again, so tell us about it when you ask for a quote.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
When something else is needed
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Damaged stone surrounds
- Whether work needs listed building consent
- Sashes that need overhauling
If in doubt, ring 0345 464 0079 or email us and we’ll say what we think.
What we seal
- Stone surrounds
- Period & listed homes
- Brick reveals
- Sash and case windows
- Timber door frames
- Tenement windows
Landlord and commercial work in Bentley
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
For anyone letting property in or around Bentley, several properties can go on one quote. Send us the addresses and the work at each.
Sand mastic in Bentley: local notes
Historic houses like Farnham Castle (about 3.8 miles north-east) are a reminder that the area around Bentley has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
For landlords with property near Bentley (Hampshire) station, any sash windows need sound mastic to keep draughts and rain out. Managing a site like Bentley Church of England Primary School? Then the mastic around its windows and doors needs looking after like any other building’s. If you live in an older home near Church of St Mary, the joint between an old wall and a newer frame is generally the first place rain gets in.
Bentley is about 4 miles west of Farnham, in Surrey. Whether you are in the middle of Bentley or further out, we cover sand mastic for every kind of property. Bentley is one of 395 towns and villages in Surrey where we work for sand mastic. You can also see our page for Reading, about 18 miles away.
All of GU10 and GU34 is covered for sand mastic. Local streets include Station Road, Broadlands Close and Eggars Field, all of which we cover. Neighbouring places we cover for sand mastic include Isington (1 mile south-west), Blacknest (1 mile south-east), Bucks Horn Oak (2 miles south-east), Holt Pound (2 miles east) and Binsted (2 miles south). We also work in nearby towns such as Guildford (14 miles east), Camberley (12 miles north-east), Farnham (4 miles east), Frimley (11 miles north-east), Haslemere (10 miles south-east) and Ash (8 miles north-east).
Landmarks near Bentley
Around Bentley, our work takes us to homes and buildings near The Star Inn, among other places. The nearest railway station is Bentley (Hampshire) station, about 0.8 miles south-east of the centre. Other landmarks nearby include Barley Pound (1.7 miles north-east) and Chase Community Hospital (5.9 miles south). Green spaces nearby include Farnham Park and Holybourne Hill.
How the job changes by surface
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.
Tenement and terrace windows
Where a building is shared, window work may involve neighbours, so check who is responsible first.