Kent · England
Sand mastic for sash & case windows in Horns Green, Kent
Sand mastic in Horns Green from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Gaps round a timber door in stone or brick
- Old sand mastic that has cracked, crumbled or fallen out
- Gaps where the frame meets the masonry
What happens if it’s left?
A silicone bead can be quicker, but on period stone or brick it often looks out of place. Sand mastic suits the building and finishes neatly against the masonry. Around Horns Green, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Why us?
- 4.9 on Google from 180+ five-star reviews
- Every job guaranteed for a year
- Neat joints and a tidy finish
- An ARBOMaster approved applicator
How we handle sand mastic in Horns Green
A silicone bead around a sash window can look out of place and does not suit the building. Sand mastic is the traditional choice and we can swap the silicone for it. Common call-outs are for window mastic to renew ahead of painting and modern sealant on a period surround, across brick reveals, timber door frames and period & listed homes.
Outdoor sealant needs dry, clean surfaces, so work on frames around Horns Green is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
Whatever the size of the job, you get the same one-year guarantee in Horns Green and across Kent.
- Where
- Horns Green (TN14)
- Region
- Kent
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What happens on the day
At the end, we look at the finished work together and explain the cure time. The work normally takes a few hours for a single window, longer for several, depending on the size of the job. Somewhere as small as Horns Green, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Move anything stored near the joints
- Mention any leaks or damp you’ve noticed
How to get a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved.
Related advice
Horns Green questions
Is Horns Green in your area for sand mastic?
Yes. We work across London and the South East, and Horns Green is part of that. You can ring 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll send you a clear quote.
I let a flat near Knockholt station. Can you help?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Are you ARBOMaster approved?
Yes. We’re an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Do you remove the old sealant?
Yes, always, and completely. New sealant will not bond properly to old, so the joint is cleaned back first.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We’ll tell you what we’re using and why.
Can I do it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Which is right for my windows, sand mastic or modern sealant?
We will help you decide. Sand mastic suits many period homes, and modern sealants suit newer frames.
How long does the job take?
Most jobs take a few hours per window, depending on the condition of the joints, including preparation and clearing up. Your quote will say how long we expect yours to take.
Quotes for sand mastic in Horns Green
The price is agreed before any work begins. It takes into account:
- The old material and how stubborn it is
- The size of the job
- Working hours on commercial sites
- The number of rooms or windows
We don’t show prices on the website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or email us and we will talk you through it.
What to tell us for a quote
When you contact us, it’s useful to know:
- How many joints, rooms or windows are involved
- Access, such as stairs, a lift or height
- If it’s domestic, commercial or a hotel
- Photos by email, if that’s easy
If you’re in Horns Green and need sand mastic, phone 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before work begins.
DIY versus a professional finish
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas 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.
Horns Green homes and the weather
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Down House (about 2.1 miles north-west) are a reminder that the area around Horns Green has older buildings as well as new. 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.
In the older streets around 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. If you look after a building such as Charles Darwin School, its window and door frames need their mastic kept sound, just like a home’s. For landlords with property near Knockholt station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Horns Green is about 5 miles west of Sevenoaks, in Kent. If you need sand mastic in Horns Green, please call 0345 464 0079 or send us an email for a quick quote. We’re based in Crawley and cover Kent, Horns Green included. Across Kent, we cover 922 places, and Horns Green is one of them. London is on our list too, around 15 miles away.
Every address in TN14 is covered for sand mastic, from the main roads to the quietest streets. Streets in the area include Cudham Lane South and Thrift Lane, all of which we cover. Nearby, we also carry out sand mastic in Burlings (1 mile north-east), Cudham (1 mile north-west), Berry's Green (1 mile north-west), Single Street (1 mile north-west) and Aperfield (2 miles west). Larger places within reach include Dartford (11 miles north-east), Sevenoaks (5 miles east), Royal Tunbridge Wells (14 miles south-east), Gravesend (15 miles north-east), Tonbridge (11 miles south-east) and Northfleet (14 miles north-east).
Landmarks near Horns Green
We work in homes and buildings around The Blacksmith's Arms, among other places. For rail, the closest station is Knockholt station, about 3.4 miles north-east of the centre. Nearby you’ll also find Orpington Hospital (3.8 miles north). Open spaces near Horns Green include Downe Bank and Betsom's Hill.
What the job involves on each surface
Brick reveals
Gaps between frame and brick let in rain and draughts. Renewing the mastic closes it.
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Keep sills and gutters clear so water drains away
- Don’t run silicone over sand mastic
- Look over the window mastic once a year
- Renew mastic before redecorating the windows
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we’re fully insured for the work.
We regularly work with letting and managing agents. Tell us the address, the job and how access works.