Kent · England
Folkestone Sand Mastic
Sand mastic in Folkestone from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Draughty sash windows at the surround
- Modern sealant on a period surround
- Gaps round a timber door in stone or brick
Aftercare tips
To keep the joints looking good and working properly:
- Keep modern sealant off the mastic
- Inspect the joints round the windows every year or so
- Make sure water runs off the sill
- Get any rot dealt with first
Check the mastic when you check the paintwork. Catching cracks early keeps repairs small.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall so early renewal protects both.
How we handle sand mastic in Folkestone
If your home is listed or in a conservation area, check with your local planning authority if consent is needed before window work. Sand mastic is often favoured as a like-for-like material. Typical jobs include gaps round a timber door in stone or brick and draughty sash windows at the surround, on tenement windows, timber door frames and brick reveals.
In a town like Folkestone, older houses sit alongside newer estates, with windows of every age. In every case, the joint between frame and wall is what keeps water out.
You get a 12-month guarantee, the same in Folkestone as everywhere else we work.
- Location
- Folkestone (CT20, CT19, CT21)
- Wider area
- Kent
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Different surfaces, different methods
Sash and case windows
Sash windows are where we do most sand mastic work. Each joint round the box is raked out and renewed.
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It suits older brickwork.
For landlords and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Why it’s worth doing now in Folkestone
Filling over old, loose mastic doesn’t last. Raking out and preparing the joint gives it a sound base so the new work lasts. Black mould and gaps in sealant do not fix themselves, and in a busy home in Folkestone they get worse with every use. Replacing the sealant now is the simplest fix.
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or email us.
What you get with us
- More than 20 years in sealant work
- Tidy, careful work
- Rated 4.9 stars on Google
- Full insurance on every job
Take a look at what affects the cost and what customers say.
Common problems we fix in Folkestone
Most of it is simply age. Even well-laid mastic needs renewing in time, depending on exposure and upkeep.
Most people get in touch when they notice something like this:
- Gaps round a timber door in stone or brick
- Modern sealant on a period surround
- Mastic that needs renewing before redecorating
- Mastic worn away on windows facing the weather
Letting a property close to Folkestone Central station? Then any sash windows need sound mastic to keep draughts and rain out.
Questions to ask before booking
- How the surfaces are prepared before sealing
- How long to leave it before use
- Whether all the old sealant comes out first
- What the quote includes, VAT included or not
The process
Every visit runs the same way: we check the joints, protect the area around them, do the work and tidy away. Most jobs take a few hours for a single window, longer for several. A visit in Folkestone needs access to the work and a place to park close by. If the job is outside, mention gates, side access and anything above ground floor.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Before we arrive
- Let us know about stairs, lifts or work at height
- Clear items away from the joints we are working on
- Keep pets and children clear of the area while we work
How to get a quote
We do not publish a price list, because every job is different. Instead, we give you a clear quote for your job. To get started, ring 0345 464 0079 or email us.
Read more
Common questions in Folkestone
I let a flat near Folkestone Central station. Can you help?
Yes, rental work is part of what we do. You can call 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before any work starts.
Can you do sand mastic in Folkestone?
Yes. Our work covers London and the South East, and Folkestone is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
Is there any odour?
Sometimes, a little. It fades as the sealant cures.
How long does the job take?
A typical job takes a few hours for a single window, longer for several, including preparation and clearing up. Your quote will say how long we expect yours to take.
Should I use sand mastic or silicone?
We’ll help you decide. Sand mastic suits many period homes, and modern sealants suit newer frames.
What does sand mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote.
When will the new mastic be hard?
Not right away. It skins first and hardens fully later, and we will tell you what to expect.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
More services for Folkestone
Windows and doors in Folkestone
Folkestone is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. Historic houses like Acrise Place (about 3.9 miles north) are a reminder that the area around Folkestone 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.
For site and facilities teams at buildings such as Stella Maris Catholic Primary School, larger buildings have plenty of frames, and the mastic around each one ages. In the older streets around United Reformed Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Folkestone is in Kent. From the centre of Folkestone to the outskirts, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Our area takes in 922 places across Kent, large and small. Our Chelmsford page covers work nearby, about 54 miles away.
Our applicators cover all of CT20, CT19 and CT21 for sand mastic and the streets around it. That includes homes and businesses on Christ Church Road, Middelburg Square and Station Road. With the A259 and A260 close by, Folkestone is simple for us to get to for sand mastic. Nearby, we also carry out sand mastic in Cheriton (1 mile west), Sandgate (1 mile south-west), Hawkinge (2 miles north), Arpinge (2 miles north-west) and Seabrook (2 miles west). Within a short drive, we also cover Ashford (14 miles west), Canterbury (14 miles north), Dover (7 miles north-east), Deal (13 miles north-east), Hythe (4 miles west) and Tower Hamlets (7 miles north-east). Folkestone is one of the larger places we cover in Kent.
What’s near Folkestone
We work in homes and buildings around The Park Inn Hotel, Lower Leas Coastal Park and The Harvey Grammar School, among other places. Folkestone has its own railway station: Folkestone Central station. Well-known places in the area include Folkestone Museum (0.7 miles south-east) and Folkestone Castle (1 mile north). The countryside around Folkestone includes Sugar Loaf Hill.
What affects the quote in Folkestone
Call for a quick quote. The main things that affect it are:
- Whether old sealant or filler has to be cut out
- How much there is to do
- The type of sealant required
- How many rooms, windows or areas are involved
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all play a part.
What we need to know
To help us quote quickly, please include:
- The problem you’ve noticed
- Pictures of the joints, sent by email
- Any access issues, like height or stairs
- Where the property is
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work and give you a clear price.