Kent · England
Sand mastic for sash & case windows in Colliers Green, Kent
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Colliers Green. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Modern sealant on a period surround
- Old sand mastic that has cracked, crumbled or fallen out
- Cracked mastic round a front door frame
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Landlords and agents in Colliers Green can book us as well as householders. Sealant work between tenants keeps a property looking cared for before the next move-in.
Sand mastic in Colliers Green, done properly
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant, and we will talk through which suits your home. Common call-outs are for cement or filler used on old window joints that has cracked and mastic that needs renewing before redecorating, across stone surrounds, brick reveals and tenement windows.
Mastic can only go onto a dry, clean joint, so window work in Colliers Green is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Colliers Green (TN17)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
All our tools and materials come with us in the van, so there’s nothing for you to buy. After a quick look at the joints together, the area is protected and the work begins. It normally takes anything from a few hours to a full day, depending on how many windows. For a village or hamlet like Colliers Green, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Clear items away from the joints we are working on
- Let us know about stairs, lifts or work at height
How to get a quote
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we’ll explain what’s involved.
Related advice
Windows and doors in Colliers Green
With historic houses such as Scotney Castle (about 4.9 miles south-west) nearby, there’s older building stock in the area around Colliers Green as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Marden station, cracked sand mastic around sash windows lets in the draughts tenants complain about. Schools such as Colliers Green Church of England Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Colliers Green is about 7 miles south-east of Paddock Wood, in Kent. From the centre of Colliers Green to the outskirts, sand mastic is available for homes and businesses alike. We cover 922 towns and villages across Kent, large and small. We also work in Crawley, around 30 miles away.
Jobs for sand mastic in TN17 is quoted and booked the same way as anywhere else. Nearby, we also carry out sand mastic in Flishinghurst (1 mile south), Horden (1 mile north), Wilsley Green (2 miles south-east), Wilsley Pound (2 miles south-east) and Cranbrook Common (2 miles east). Further out, we also cover Maidstone (10 miles north), Ashford (15 miles east), Royal Tunbridge Wells (11 miles west), Tonbridge (12 miles north-west), Kings Hill (11 miles north-west) and Foley Park (11 miles north).
Near you in Colliers Green
We work in homes and buildings around High Weald Academy and The Gill. Colliers Green’s nearest station is Marden station, about 3.9 miles north of the centre. Nearby you will also find Sissinghurst Castle (3 miles east) and Benenden Hospital (5.1 miles south-east).
Colliers Green questions
Do you work for landlords with property near Marden station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Is Colliers Green within the area you cover?
Yes, Colliers Green is covered. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Should I use sand mastic or silicone?
That depends on your windows. Period windows in stone or brick normally suit sand mastic, while modern frames normally get a flexible sealant.
Are you fully insured?
Yes. We’re fully insured, and we can confirm the details when we quote.
Do the sealants smell?
There can be a smell while the sealant cures, but it fades. Ventilation helps.
Where are you based?
We are a Crawley-based firm. Our area covers South East England, London and Scotland.
Is it possible to paint over sand mastic?
It’s traditionally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
Do you guarantee sand mastic work?
Our 12-month guarantee applies on every job.
Leave it or put it right?
Cement-based fillers and modern sealants do not always suit a period 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 Colliers Green, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why choose Mr Mastic in Colliers Green
- Trusted Arbo and Everbuild sealants
- Domestic, commercial and hotel work
- A 12-month guarantee on all work
- Old sealant always removed completely
See our cost guide and customer reviews.
What we are called out for in Colliers Green
Paint, silicone or cement used over old mastic causes problems. They don’t suit the joint, and they normally need raking out.
Any of these means the joints need attention:
- Wind and rain getting in round a sash window
- Mastic that needs renewing before redecorating
- Gaps where the frame meets the masonry
- Gaps round a timber door in stone or brick
Scotney Castle, about 4.9 miles south-west, is one of the historic houses in the wider area around Colliers Green.
Questions to ask before you book
- How much experience the applicator has
- What happens if the job turns out different
- What the cure time is
- Are they insured?
DIY versus a professional finish
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.
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.
What sealant work cannot fix
Sealant isn’t the answer to every problem, and we will tell you before work begins. Sealant will not put right:
- Masonry that needs repairing
- Putty and glazing repairs
- Decisions on consent for listed homes
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.
Joints and surfaces we work on
- Sash and case windows
- Timber door frames
- Brick reveals
- Stone surrounds
- Tenement windows
- Period & listed homes
Also near Colliers Green
More services for Colliers Green
What the job involves on each surface
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair so it’s worth checking responsibilities.
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.