Kent · England
Guston Sand Mastic
Problem with your window and door surrounds in Guston? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Mastic worn away on windows facing the weather
- Gaps round a timber door in stone or brick
- Patchy fillers round a sash window
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
How we handle sand mastic in Guston
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. We work on brick reveals, timber door frames and sash and case windows, and the jobs we see most are a silicone bead on a sash window that spoils the look and old cement repairs round a window that have failed.
Outdoor sealant needs dry, clean surfaces, so work on frames around Guston is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Each job carries a 12-month guarantee, large or small.
- Place
- Guston (CT15)
- Region
- Kent
- Cover
- 12 months on all our work
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How the job changes by surface
Timber door frames
Sand mastic is used round timber door frames too. We renew it the same way as on windows.
Period and listed homes
Many older homes were built with sand mastic round the windows. On listed buildings, check with your planning authority first.
How to look after the new joints
To keep the joints looking good and working properly:
- Renew mastic before redecorating the windows
- Ask us before painting near the mastic
- Make sure water runs off the sill
- Take care around the mastic when scraping paint
Avoid painting over the new mastic, which is the traditional advice. Ask us before any decorating around it.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall so early renewal protects both.
Your questions about sand mastic in Guston
Does living near the coast affect sand mastic in Guston?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Can you help a landlord with a rental near Martin Mill 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.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Guston.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
How do I get a quote for sand mastic in Guston?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Can I paint the new mastic?
It’s traditionally left unpainted, as guidance on traditional windows advises. Talk to us before any painting near it.
Do you need sand mastic in Guston?
Timber frames move with the seasons. The movement cracks the mastic little by little.
These are the problems we’re asked about most:
- Silicone on a period window that looks wrong
- Draughty sash windows at the surround
- Gaps round a timber door in stone or brick
- Patchy fillers round a sash window
For an older house near a landmark such as Church of St Martin of Tours, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Questions to ask before you book
- Is the old sealant removed completely?
- Whether the sealant suits the joint
- What happens if they find a problem under the old sealant
- How the surfaces are prepared before sealing
Towns and villages near Guston
Other services in Guston
What happens if it’s left?
An open joint round the frame lets weather in. Left, water can reach the timber and the wall, so dealing with it now protects both. In a small place like Guston, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
The cost depends on the size of the job, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
What you get with us
- One-year guarantee on every job
- Domestic, commercial and hotel work
- ARBOMaster approved applicator
- Old sealant always removed completely
See what affects the cost and our reviews.
What we do, step by step
There isn’t much for you to do on the day. Show us the job and we will take it from there. The job generally takes anything from a few hours to a full day, depending on how many windows. Somewhere as small as Guston, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
How to prepare
- Keep pets and children clear of the area while we work
- Tell us about any previous sealing or DIY attempts
- Mention any tricky access
Get a quote
Asking for a quote is easy: tell us what needs doing and where. A few pictures by email make the job easier to understand.
Read more
Quotes for sand mastic in Guston
The price is agreed before any work begins. It’s based on:
- Whether the work is at height
- Working hours on commercial sites
- How many areas need sealing
- Any mould that needs treating
What you pay reflects the work, not a rough estimate. That is why we ask about the job first.
Helping us quote
When you call or email, these details help:
- How we’d reach the joints
- Where the job is, and your postcode
- What the problem is, such as mould, gaps, leaks or cracking
- If someone has resealed it before
If you are in Guston and need sand mastic, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you’ll get a clear quote before any work starts.
What sand mastic looks like in Guston
Guston is within about 2 miles of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Historic houses like Walmer Castle (about 4.7 miles north-east) are a reminder that the area around Guston 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.
For site and facilities teams at buildings such as Duke of York's Royal Military School, its window and door frames need their mastic kept sound, just like a home’s. If you let a flat or house near Martin Mill station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Guston is about 2 miles north-east of Dover, in Kent. Wherever you are in the CT15 postcode area, we cover sand mastic for homes and businesses. Our area takes in 922 places across Kent, large and small. For nearby work, see our Chelmsford page, about 54 miles away.
Here we cover the CT15 postcode area for sand mastic. Local streets include The Street, Chance Meadow and The Lane, all of which we cover. Other places close to Guston include East Langdon (1 mile north-east), Church Whitfield (1 mile north-west), West Cliffe (1 mile east), Martin Mill (2 miles north-east) and Charlton-in-Dover (2 miles south-west). Larger places within reach include Canterbury (14 miles north-west), Folkestone (8 miles south-west), Ramsgate (13 miles north), Broadstairs (15 miles north), Deal (5 miles north-east) and Hythe (12 miles south-west).
Landmarks near Guston
In Guston, that means homes and buildings near Connaught Park, St Edmund's Catholic School and Swingate Inn. The nearest railway station is Martin Mill station, about 1.6 miles north-east of the centre. Nearby you’ll also find Royal Victoria Hospital (1.9 miles south) and Dover Castle (1.8 miles south). Not far away are Dover Western Heights.