Kent · England
Riverhead Sand Mastic
Specialist sand mastic for Riverhead: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Old sand mastic that has cracked, crumbled or fallen out
- Cement or filler used on old window joints that has cracked
- Tired mastic found when preparing windows for paint
Can I do it myself?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
About our sand mastic in Riverhead
If your home is listed or in a conservation area, check with your local planning authority whether consent is needed for work to windows. Like-for-like sand mastic is often the preferred finish. We work on brick reveals, timber door frames and stone surrounds, and people most often call us about old sand mastic that has cracked, crumbled or fallen out and cement or filler used on old window joints that has cracked.
Homes around Riverhead range from older properties to newer houses, and their windows range just as widely. Each frame material needs the right sealant against the right wall.
Our work is backed for twelve months, in Riverhead and everywhere else we cover.
- Place
- Riverhead (TN13, TN14)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
For landlords and businesses
We also work for property managers and facilities teams. We can quote a run of properties together, and we’re fully insured for the work.
Failed sealant is one of the commonest items on a check-out report. Several properties can be quoted together.
What happens on the day
Every visit runs the same way: we look at the joints together, protect the area around them, carry out the job and tidy away. It normally takes a few hours for a single window, longer for several. In a smaller place like Riverhead, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- We check the window surrounds and agree which joints need renewing.
- We rake out the old mastic and clean the joint.
- Large voids are packed out first, so the mastic is not too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- We dress the surface so it sits neatly against the masonry.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- On commercial sites, let us know about site rules
- Mention any leaks or damp you’ve noticed
Getting a quote
Getting a quote is simple: let us know the job and the location. Photos by email help us understand the job, and we will come back to you with a quote.
Related advice
Places near Riverhead
What else we do in Riverhead
What sand mastic looks like in Riverhead
Historic houses like Knole House (about 2 miles south-east) are a reminder that the area around Riverhead has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you let a flat or house near Sevenoaks station, any sash windows need sound mastic to keep draughts and rain out. Managing a site like Amherst School? Then its window and door frames need their mastic kept sound, just like a home’s. For an older house near a landmark such as Church of St Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Riverhead is about 1 mile west of Sevenoaks, in Kent. Wherever you are in the TN13 postcode area, we cover sand mastic for homes and businesses. Our Kent coverage runs to 922 places, Riverhead among them. We also work in London, around 19 miles away.
Work in TN13 and TN14 is quoted and booked the same way as anywhere else. Whether your property is on London Road, Hamlin Road and Witches Lane or anywhere close by, we can help. Neighbouring places we cover for sand mastic include Dunton Green (1 mile north), Bessels Green (1 mile south-west), Sevenoaks (1 mile east), Chipstead (1 mile west) and Kippington (1 mile south). Further out, we also cover Maidstone (15 miles east), Dartford (11 miles north), Royal Tunbridge Wells (11 miles south), Gravesend (14 miles north-east), Tonbridge (8 miles south-east) and Northfleet (13 miles north-east).
What’s near Riverhead
Locally, jobs take us to homes and businesses close to The Beehive Public House, Trinity School and Montreal Park, among other places. The closest station to Riverhead is Sevenoaks station, roughly 0.8 miles south-east. Other landmarks nearby include Kemsing Castle Bank (3 miles north-east) and Sevenoaks Museum (1.4 miles south-east). Not far away are Dryhill Nature Reserve and Betsom's Hill.
Quotes for sand mastic in Riverhead
Jobs vary more than people expect. What affects the quote:
- The product the joint needs
- How many areas need sealing
- Mould in or behind the old joints
- How easy the joints are to reach
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 we start.
Asking for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- A few photos by email, if you can
- If it’s domestic, commercial or a hotel
- What’s wrong with the joints now
- Roughly how big the job is
We quote each job on its own, so the first step is telling us about yours. Simply phone 0345 464 0079 or drop us an email and describe the job.
Riverhead: your questions answered
Will you come out to Riverhead?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is Riverhead in your area for sand mastic?
Yes. Our work covers London and the South East, and Riverhead is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
How long does the job take?
It depends on the size of the job, but as a guide it takes a few hours per window, depending on the condition of the joints. We will tell you when we quote.
Is it possible to take out silicone and use sand mastic instead?
In most cases. We remove the silicone and clean the joint, then point it with sand mastic.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
How long does sand mastic take to harden?
The surface skins quite quickly, then hardens over a longer period. Timing depends on the weather and the joint.
Can you quote for more than one area?
Yes. Several rooms, windows or areas can go on one quote.
When it is not the sealant
Before you book, it’s worth knowing the limits too:
- Masonry that needs repairing
- Planning or listed building consent (your local planning authority decides)
- Sash cords, weights and draught-proofing of the sashes
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly.
Surfaces we seal
- Sash and case windows
- Brick reveals
- Stone surrounds
- Timber door frames
- Period & listed homes
- Tenement windows
Different surfaces, different methods
Sash and case windows
A sash window’s box frame sits in the masonry opening. The gap round it is pointed with sand mastic.
Period and listed homes
Period homes look their best with traditional materials, and sand mastic is one of them.
Looking after it afterwards
After the cure time, these simple habits help:
- Find out about consent before window work on a listed home
- Plan mastic work ahead of painting
- 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.
Sound mastic protects the frame. Once it fails, water can sit against the timber and timber that stays wet can rot.