Kent · England
Groombridge Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Groombridge and across Kent. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Mastic worn away on windows facing the weather
- Mastic round period door frames that has failed
- Mastic that needs renewing before redecorating
Sand mastic in Groombridge, done properly
Traditional burnt sand mastic that sits naturally against stone and brick. It suits period and listed homes where a modern sealant bead would stand out. We work on period & listed homes, brick reveals and tenement windows, and the jobs we see most are failed mastic on an exposed elevation and open joints round the window box.
Homes in small places like Groombridge often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
A 12-month guarantee comes as standard, so you’re not left on your own once the job is done.
- Location
- Groombridge (TN3)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Groombridge: your questions answered
Is Groombridge in your area for sand mastic?
Yes. We work across London and the South East, and Groombridge is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Do you work for landlords with property near Eridge station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can ring 0345 464 0079 or email us with the details for a clear quote.
Should I use sand mastic or silicone?
That depends on your windows. Period windows in stone or brick generally suit sand mastic, while modern frames normally get a flexible sealant.
What do you put in the joint?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
Do you guarantee sand mastic work?
There’s a 12-month guarantee on every job.
Can I do it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Groombridge and the rest of Kent, along with the rest of our area.
Do I have to be there?
That depends on where the joints are. Inside work needs someone to give us access.
Towns and villages near Groombridge
More services for Groombridge
Why act early in Groombridge
Cement-based fillers and modern sealants don’t always suit a period surround. Sand mastic is the like-for-like choice and that can be important for listed homes. In a small place like Groombridge, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Combining jobs into one visit generally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We’ll give you a clear price for the lot.
Why Groombridge customers choose us
- Rated 4.9 stars on Google
- Arbo and Everbuild products
- Old sealant always removed completely
- Tidy, careful work
See our cost guide or our reviews.
What happens on the day
We keep the work tidy and contained to the joints we are treating, so you can get on with your day. Expect the work to take anything from a few hours to a full day, depending on how many windows. In a small place like Groombridge, access is normally 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.
- Old, loose mastic is raked out and the joint cleaned.
- 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.
- The mastic is finished to sit tidily against the stone or brick.
Before we arrive
- Mention any parking rules near the property
- Mention any leaks or damp you’ve noticed
- Mention if the joints have been sealed before
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. Whenever you are ready, phone 0345 464 0079 or email us.
Related advice
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
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, then guaranteed for a year.
Signs you need sand mastic in Groombridge
Paint, silicone or cement used over old mastic causes problems. They don’t move with the timber, and they normally need raking out.
The problems people usually mention when they call include:
- Old sand mastic that has cracked, crumbled or fallen out
- Mastic round period door frames that has failed
- Wind and rain getting in round a sash window
- Silicone on a period window that looks wrong
Schools such as Groombridge St Thomas' Church of England Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Comparing quotes
- When the joint can take water or movement
- What happens if they find a problem under the old sealant
- Who turns up on the day
- Whether you can choose the colour
Quotes for sand mastic in Groombridge
Some jobs are bigger than they look, and some smaller. The main factors:
- Mould in or behind the old joints
- Which sealant suits the joint
- Whether old sealant or filler has to be cut out
- Access and height
A failed joint rarely gets cheaper to fix by waiting. If you’re unsure, call 0345 464 0079 or drop us an email for an honest opinion and a quote.
Asking for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- What’s wrong with the joints now
- If it’s domestic, commercial or a hotel
- Whether it has been sealed before
- Photos by email, if that is easy
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work.
Windows and doors in Groombridge
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Groombridge Place (about 0.4 miles north-east) nearby, there’s older building stock in the area around Groombridge 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.
If you live in an older home near Church of St Thomas the Apostle, frames set in older brick or stone need a sealant that suits the wall as well as the frame. For landlords with property near Eridge station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Groombridge is about 4 miles south-west of Royal Tunbridge Wells, in Kent. Anywhere in TN3, our applicators can take on sand mastic. Groombridge is one of 922 towns and villages in Kent where we work for sand mastic. Our Crawley page covers work nearby.
Jobs for sand mastic in TN3 works the same way as everywhere else we cover. If you need sand mastic at a property on Station Road, Meadow Road and Orchard Rise or a nearby road, our applicators can take on the job. Other places close to Groombridge include Birchden (1 mile south-east), Stone Cross (1 mile north), Ashurst (2 miles north-west), Balls Green (2 miles west) and Fordcombe (2 miles north). Further out, we also cover Sevenoaks (12 miles north), Royal Tunbridge Wells (4 miles north-east), Tonbridge (7 miles north-east), Kings Hill (15 miles north-east), Paddock Wood (10 miles north-east) and Southborough (4 miles north-east).
Local landmarks in Groombridge
Groombridge’s nearest station is Eridge station, about 1.8 miles south-east of the centre. Nearby you’ll also find Tunbridge Wells Homeopathic Hospital (3.5 miles east) and The Corn Exchange (3.3 miles east). Open spaces near Groombridge include Broadwater Warren RSPB Reserve.
Work for landlords, hotels 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.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Clear gutters so water does not pour onto the windows
- Get any rot dealt with first
- Plan mastic work ahead of painting
- Don’t paint over the new mastic
Make sure water drains away from the window surround. Water sitting against the mastic shortens its life.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.