Kent · England
Sand Mastic in Platt
Sand mastic in Platt from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Mastic that needs renewing before redecorating
- Mastic worn away on windows facing the weather
- Crumbling sand mastic round a window
Common problems we fix in Platt
Some old mastic was never deep enough. A thin layer does not hold well so we make sure the new mastic is the right thickness.
People generally contact us after spotting something like this:
- Draughts and rain around sash boxes
- Failed mastic on an exposed elevation
- Cracked mastic round a front door frame
- Modern sealant on a period surround
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.
Before booking anyone
- Whether the sealant suits the joint
- Whether VAT is included
- Are they insured?
- Who turns up on the day
Sand mastic for homes and businesses in Platt
Sand mastic suits most period window surrounds. Newer frames normally get a flexible sealant instead, and we’ll talk through which suits your home. We work on stone surrounds, tenement windows and period & listed homes, and the jobs we see most are mastic dropping out of the joint and draughts and rain around sash boxes.
Mastic can only go onto a dry, clean joint, so window work in Platt is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
There’s a 12-month guarantee on every job, whatever its size.
- Where
- Platt (TN15)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Other services in Platt
Different surfaces, different methods
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Brick reveals
An open joint at a brick reveal lets weather in. Renewing the mastic closes it.
What happens if it’s left?
If you’re redecorating, renew the mastic first. Paint over cracked mastic won’t stop the gaps, and the new mastic is traditionally left unpainted. Older cottages and farmhouses around Platt can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
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.
Why Platt clients choose us
- Neat joints and a tidy finish
- Quality sealants from Arbo and Everbuild
- Approved under the ARBOMaster scheme
- Over 20 years’ experience
See what affects the cost and our reviews.
Windows and doors in Platt
Historic houses like Old Soar Manor (about 1.9 miles south) are a reminder that the area around Platt has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s 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 Borough Green & Wrotham station, older sash windows in a rental need their mastic kept sound to keep the weather out. Managing a site like Platt Church of England Voluntary Aided Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
Platt is about 6 miles east of Sevenoaks, in Kent. We provide sand mastic to homes and businesses in Platt and nearby. Platt is one of 922 towns and villages in Kent where we work. Our London page covers work nearby (23 miles or so).
Work in TN15 is quoted and booked the same way as anywhere else. That includes homes and businesses on St Mary's Close, Grange Road and Platt Common. Neighbouring places we cover for sand mastic include Comp (1 mile south-east), Borough Green (1 mile west), Crouch (1 mile south-west), Wrotham Heath (1 mile north-east) and Basted (1 mile south-west). Within a short drive, we also cover Maidstone (9 miles east), Dartford (12 miles north-west), Sevenoaks (6 miles west), Royal Tunbridge Wells (11 miles south), Gravesend (10 miles north) and Tonbridge (7 miles south).
Landmarks near Platt
In Platt, that means homes and buildings near Wrotham School, The Blue Anchor pub and Wrotham School. For rail, the closest station is Borough Green & Wrotham station, about 0.9 miles west of the centre. Other landmarks nearby include Ightham Court (1.8 miles west) and Beechin Wood Archery Museum (less than half a mile south-east).
The process
Most of a good job is in the preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours for a single window, longer for several. Somewhere as small as Platt, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Preparing for the visit
- Let us know about stairs, lifts or work at height
- Tell us about any previous sealing or DIY attempts
- Move anything stored near the joints
Get a quote
For sand mastic in Platt, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
Read more
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. Our tips:
- Take care around the mastic when scraping paint
- Check with your local planning authority if your home is listed
- Get any rot dealt with first
- Look over the window mastic once a year
When preparing windows for paint, take care around the mastic. Hard scraping can loosen it.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall, so renewing it early is worth it.
For landlords and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
If you manage several properties in or around Platt, several properties can be quoted together. Just tell us the addresses and what each one needs.
How we quote for sand mastic
Your quote is based on your job. We look at:
- Whether old sealant or filler has to be cut out
- How easy the joints are to reach
- The size of the job
- Any mould that needs treating
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Asking for a quote
There’s no need for technical detail. It helps if you can tell us:
- Where the property is
- If someone has resealed it before
- If it’s domestic, commercial or a hotel
- How many joints, rooms or windows are involved
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. When it suits you, ring 0345 464 0079 or send us an email.
Your questions about sand mastic in Platt
I let a flat near Borough Green & Wrotham station. Can you help?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or email us and tell us about the property, and we’ll send you a clear quote.
Do you cover smaller places like Platt?
Yes, Platt is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Is consent needed for window work on a listed home?
Speak to your local planning authority before work starts. Like-for-like sand mastic is often the preferred finish, but they decide.
Is it possible to take out silicone and use sand mastic instead?
Often, yes. With the silicone removed and the joint cleaned, sand mastic is applied by hand.
Can I paint the new mastic?
It’s traditionally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
Do I need to be at home?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you don’t need to watch us work.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few pictures.
Will you leave a mess?
Tidy work is part of the job. Nearby surfaces are protected, and the area is left clean when we finish.