Kent · England
Sand Mastic in Tonbridge
Window and door surrounds in Tonbridge need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Old cement repairs round a window that have failed
- Window mastic to renew ahead of painting
- Mastic round period door frames that has failed
How we handle sand mastic in Tonbridge
Old sand mastic cracks, crumbles and falls out over time and gaps open up round the frame. We rake it out and renew it so the surround looks right again. We work on timber door frames, brick reveals and sash and case windows, and people most often call us about mastic round period door frames that has failed and crumbling sand mastic round a window.
Walls in Tonbridge that face the prevailing wind take the most weather, so the mastic there tends to fail first. It’s worth looking at every frame, not just the one that leaks.
We stand behind the work with a one-year guarantee, so you are covered after we have gone.
- Location
- Tonbridge (TN9, TN10, TN11)
- Wider area
- Kent
- Guarantee
- One year on every job
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What the job involves on each surface
Timber door frames
Doors face weather and wear, so their mastic can fail sooner. We rake it out and renew it.
Stone surrounds
The stone is treated with care when the old mastic comes out.
Windows and doors in Tonbridge
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Ightham Mote (about 4.1 miles north) nearby, there’s older building stock in the area around Tonbridge as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you let a flat or house near Tonbridge station, cracked sand mastic around sash windows lets in the draughts tenants complain about. Managing a site like New Beacon School? Then the mastic around its windows and doors needs looking after like any other building’s.
Tonbridge is about 12 miles south-west of Maidstone, in Kent. Every kind of property in Tonbridge is covered for sand mastic. The work is guaranteed for a year. Our Kent coverage runs to 922 places, and Tonbridge is one of them. There’s also a page for Crawley, roughly 21 miles from Tonbridge.
Work in TN9, TN10 and TN11 is quoted and booked the same way as anywhere else. We cover properties on High Street, Old London Road and London Road. Being close to the A26 and A227, Tonbridge is easy for our applicators to reach for sand mastic. Neighbouring places we cover for sand mastic include Lower Haysden (2 miles south-west), Leigh (3 miles west), Bidborough (3 miles south-west), Southborough (3 miles south) and Printstile (3 miles south-west). Within a short drive, we also cover Maidstone (12 miles north-east), Sevenoaks (7 miles north-west), Royal Tunbridge Wells (4 miles south), Swanley (14 miles north), Kings Hill (7 miles north-east) and Foley Park (12 miles north-east).
What’s near Tonbridge
Typical jobs here are in homes near Haysden Country Park, Royal Rise Primary School and Hillview School for Girls, among other places. Tonbridge’s nearest station is Tonbridge station, roughly 0.6 miles south-west. Nearby you will also find The Milne Museum (less than half a mile west) and Tonbridge Castle (within half a mile south-west). The countryside around Tonbridge includes Tudeley Woods RSPB reserve and Barden Lake.
When to call us in Tonbridge
Over the years, sand mastic weathers. It hardens, cracks and starts to come away from the frame or the masonry.
Keep an eye out for these signs:
- 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
- Silicone on a period window that looks wrong
For an older house near a landmark such as Church of St Peter and St Paul, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Comparing quotes
- The length of the guarantee
- Whether you can choose the colour
- How long to leave it before use
- Whether they seal over old material or remove it
For landlords and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Why act early in Tonbridge
Before painting the windows, it pays to renew the mastic. Painting over failed mastic does not seal it and traditional guidance is to leave the new mastic unpainted. In Tonbridge, as anywhere, most leaks start as a small gap in a joint, and they’re far easier to fix early.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.
Why choose Mr Mastic in Tonbridge
- We leave the area clean and tidy
- Experience in homes, commercial sites and hotels
- More than 20 years in sealant work
- Every job guaranteed for a year
Common questions in Tonbridge
Is sand mastic in Tonbridge guaranteed?
All our work, in Tonbridge and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
I let a flat near Tonbridge station. Can you help?
Yes. We work for landlords and agents as well as householders. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Should I try DIY first?
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.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Do you offer different sealant colours?
Most of the time, yes. We will tell you which colours the right product comes in.
Will it make a mess?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Should I check with the council before work on a listed or conservation-area home?
It’s best to ask your local planning authority first. Like-for-like sand mastic is often the preferred finish but the decision is theirs.
How long does the job take?
Most jobs take a few hours for a single window, longer for several, including the preparation. We’ll confirm how long when we quote.
How the visit works
Good joint work is mostly preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours for a single window, longer for several. A visit in Tonbridge needs access to the work and a place to park close by. If the job is outside, mention gates, side access and anything above ground floor.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- We dress the surface so it sits neatly against the masonry.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Mention any parking rules near the property
- On commercial sites, let us know about site rules
How to get a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved and give you a clear quote.
Advice
Can I do it myself?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
What affects the cost of sand mastic
Call for a quick quote. The main things that affect it are:
- How easy the joints are to reach
- The product the joint needs
- How many rooms, windows or areas are involved
- How much old sealant there is and how hard it is to remove
The cost depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before any work starts, so you know where you stand.
What to tell us for a quote
To help us quote quickly, let us know:
- What the problem is, such as mould, gaps, leaks or cracking
- If someone has resealed it before
- A few pictures by email, if you can
- Where the property is
For a quote, ring 0345 464 0079 or send us an email with the location and a short description of the problem. You will have a clear quote before we start.