Kent · England
Sand mastic for sash & case windows in Cobham, Kent
We cover Cobham for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Draughts and rain around sash boxes
- Gaps round a timber door in stone or brick
- Patchy fillers round a sash window
Sand mastic in Cobham
Old sand mastic cracks, crumbles and falls out over time, leaving gaps round the window. We rake it out and renew it and tidies the surround. If you’re dealing with window mastic to renew ahead of painting and a silicone bead on a sash window that spoils the look, we can put it right, on tenement windows, stone surrounds and brick reveals alike.
Homes in small places like Cobham often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
Each job carries a 12-month guarantee, large or small.
- Location
- Cobham (DA12)
- Region
- Kent
- Guarantee
- One year on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
When to call us in Cobham
Some old mastic was never deep enough. Mastic that’s too thin cracks and drops out so we make sure the new mastic is the right thickness.
Any of these means the joints need attention:
- Gaps round a timber door in stone or brick
- Modern sealant on a period surround
- Tired mastic found when preparing windows for paint
- Gaps where the frame meets the masonry
If you look after a building such as Cobham Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Before booking anyone
- Whether they’re fully insured
- Whether VAT is included
- How long to leave it before use
- How long the guarantee is
Also in Cobham
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too in Cobham and across Kent. Several sites can go on one quote, and we are fully insured.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Windows and doors in Cobham
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Cobham College (about 0.2 miles south-west) are a reminder that the area around Cobham 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.
If you let a flat or house near Sole Street station, any sash windows need sound mastic to keep draughts and rain out. Homes close to Parish Church of St Mary Magdalene include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in.
Cobham is about 3 miles south of Gravesend, in Kent. Anywhere in DA12, our applicators can take on sand mastic. Across Kent, we cover 922 places, Cobham among them. London is on our list too, about 23 miles from Cobham.
Here we cover the DA12 postcode area for sand mastic. Streets in the area include The Street, Lawrence Drive and Cobhambury Road, all of which we cover. If you’re just outside Cobham, we cover Upper Bush (2 miles south-east), Lower Bush (2 miles south-east), Cuxton (2 miles south-east), North Halling (3 miles south-east) and Upper Halling (3 miles south). Within a short drive, we also cover Maidstone (10 miles south-east), Sittingbourne (15 miles east), Dartford (8 miles north-west), Sevenoaks (12 miles south-west), Gravesend (3 miles north) and Tonbridge (14 miles south).
Near you in Cobham
We work in homes and buildings around Thamesview School, The Ship Inn and Jeskyns, among other places. The nearest railway station is Sole Street station, about 1.2 miles south-west. Other landmarks nearby include Rochester Castle (4.3 miles east) and Gravesham Community Hospital (3.9 miles north-west). For a walk, there’s Gad's Hill and Ranscombe Farm.
When something else is needed
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Masonry that needs repairing
- Putty and glazing repairs
- Whether work needs listed building consent
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
Where we work in Cobham
- Period & listed homes
- Tenement windows
- Timber door frames
- Brick reveals
- Sash and case windows
- Stone surrounds
Why deal with it now?
New mastic over crumbling mastic will not hold. Raking out and preparing the joint gives it a sound base so the new work lasts. Older cottages and farmhouses around Cobham can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we’ll explain what it covers.
Why book with us
- A 12-month guarantee on all work
- Arbo and Everbuild products
- 4.9 on Google from 180+ five-star reviews
- We’re fully insured
Take a look at what affects the cost or what customers say.
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
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 like Cobham needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Before we arrive
- Move anything stored near the joints
- Keep children and pets away from the work area
- Mention any tricky access
Get a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we will talk you through the work before giving you a price.
Related advice
Quotes for sand mastic in Cobham
The price is agreed before any work begins. It takes into account:
- The size of the job
- When we can work, for business premises
- Whether there’s mould to deal with
- Whether old sealant or filler has to be cut out
What it costs depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before work begins.
Helping us quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- The problem you’ve noticed
- The type of property
- The rough size of the job
- Pictures of the joints, sent by email
For sand mastic in Cobham, call 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
FAQs for Cobham
Do you cover smaller places like Cobham?
Yes. Cobham is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you help a landlord with a rental near Sole Street station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Do you do commercial work?
Yes. We have worked for hotels, offices and other businesses.
How long will you be here?
It depends on the size of the job, but most jobs take a few hours per window, depending on the condition of the joints. We’ll give you a better idea when we quote.
How long does sand mastic take to go off?
The surface skins quite quickly, then hardens over a longer period. The weather and joint depth both affect it.
Will you leave a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Where do you work from?
Our base is Crawley. We work across South East England, London and Scotland.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.