Kent · England
Sand mastic for sash & case windows in Gravesend, Kent
Problem with your window and door surrounds in Gravesend? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Mastic round period door frames that has failed
- Draughts and rain around sash boxes
- Mastic dropping out of the joint
What affects the cost of sand mastic
The price is agreed before any work begins. It takes into account:
- The type of sealant required
- When we can work, for business premises
- How many rooms, windows or areas are involved
- Whether the work is at height
A failed joint rarely gets cheaper to fix by waiting. If you’re not sure whether it needs doing, call 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
What we need to know
When you call or email, these details help:
- Where the job is, and your postcode
- The rough size of the job
- What the problem is, such as mould, gaps, leaks or cracking
- If it’s domestic, commercial or a hotel
Want a quote for sand mastic? Please call 0345 464 0079 or send us an email with a few details. We will explain what we’d do and give you a clear price before work begins.
Sand mastic in Gravesend, done properly
Silicone on a period window often looks wrong and doesn’t suit the building. Sand mastic is the traditional choice, and we can replace one with the other. If you have patchy fillers round a sash window and gaps where the frame meets the masonry, we can put it right.
In a town like Gravesend, older houses sit alongside newer estates, with windows of every age. All of them depend on a sound bead of mastic between frame and wall.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Where
- Gravesend (DA12, DA11)
- Wider area
- Kent
- Cover
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Towns and villages near Gravesend
More services for Gravesend
Questions from Gravesend
Does the coastal weather in Gravesend affect outside sealant?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. It’s worth checking the walls that face the sea first.
I let a flat near Gravesend station. Can you help?
Yes. We work for landlords and agents as well as householders, and several properties can be quoted together. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
What’s sand mastic made of?
It’s the traditional filler for the joint round timber windows and doors. It combines sand with a linseed-oil-based binder.
Can I do it myself?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Will it make a mess?
Tidy work is part of the job. We protect what’s around the joints, and we clear up when we’re done.
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.
Which is right for my windows, sand mastic or modern sealant?
We’ll help you decide. Sand mastic suits many period homes, and modern sealants suit newer frames.
Is there any odour?
Sometimes, a little. Any smell clears as the sealant cures.
What happens if it’s left?
Silicone might seem the quicker option, but it can look wrong on a period surround. Sand mastic suits the building and finishes neatly against the masonry. Black mould and gaps in sealant do not fix themselves, and in a busy home in Gravesend they get worse with every use. Now is the easy time to put it right.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
Why book with us
- 20+ years of sealant experience
- 12-month guarantee on every job
- 180+ five-star Google reviews
- We never seal over old sealant
See our cost guide or our reviews.
DIY sealant or a professional job?
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, then guaranteed for a year.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so just mention it when you contact us.
Frames and glazing around Gravesend
Gravesend is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. Historic houses like Cobham College (about 2.9 miles south) are a reminder that the area around Gravesend has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Managing a site like Whitehill Primary 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 Christ Church Milton, frames set in older brick or stone need a sealant that suits the wall as well as the frame. For landlords with property near Gravesend station, any sash windows need sound mastic to keep draughts and rain out.
Gravesend is about 9 miles north-west of Gillingham, in Kent. Every kind of property in Gravesend can book us for sand mastic. Every job comes with our one-year guarantee. Our Kent coverage runs to 922 places, Gravesend among them. There’s also a page for London, roughly 21 miles from Gravesend.
Work in DA12 and DA11 is quoted and booked the same way as anywhere else. If you need sand mastic at a property on Christ Church Road, Hillside Drive and Laurel Avenue or anywhere close by, we can help. With the A2 and A226 close by, Gravesend is easy for our applicators to reach for sand mastic. We also cover the places around Gravesend: Windmill Hill (1 mile north-west), Milton-next-Gravesend (1 mile north-east), Denton (1 mile east), Singlewell or Ifield (1 mile south) and Northfleet (1 mile west). We also work in nearby towns such as Maidstone (13 miles south-east), Dartford (7 miles west), Sevenoaks (13 miles south-west), Swanley (9 miles west), Kings Hill (11 miles south) and Foley Park (12 miles south-east).
Near you in Gravesend
Typical jobs here are in homes near Northfleet Urban Country Park, St John's Catholic Comprehensive and St John's Catholic Comprehensive. For rail, the closest station is Gravesend station, roughly 0.9 miles north-west of the centre. Other landmarks nearby include Gravesham Museum (0.9 miles north-west) and Stone Castle (4.5 miles west). Green spaces nearby include Sawyers Lake and Gad's Hill.
Different surfaces, different methods
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We work on single windows or whole elevations.
Timber door frames
A neat sand mastic joint round a front door suits a period home.
How the visit works
We keep the work tidy and contained to the joints we’re treating. Expect the work to take anything from a few hours to a full day, depending on how many windows, and we explain the cure time before we leave. For a job in Gravesend, we need access to where the work is and somewhere nearby to park. If the job is outside, mention gates, side access and anything above ground floor.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Plan for the work area to be out of bounds to pets and children
- On commercial sites, let us know about site rules
Get a quote
For a quote, phone 0345 464 0079 or send us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Read more
Aftercare tips
Joint life depends on how it’s used and looked after. We suggest:
- Avoid patching sand mastic with silicone
- Ask the planning authority about consent for listed or conservation-area homes
- Make sure water runs off the sill
- Check the mastic when you check the paintwork
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
When something else is needed
New sealant can’t fix everything, and we’ll tell you before any work starts. Sealant will not put right:
- Damaged stone surrounds
- Decisions on consent for listed homes
- Rotten sashes, sills or window boxes (a joiner’s job)
If you’re not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer.
Joints and surfaces we work on
- Timber door frames
- Brick reveals
- Period & listed homes
- Stone surrounds
- Tenement windows
- Sash and case windows