Kent · England
Sand mastic for sash & case windows in Northwood, Kent
Sand mastic in Northwood from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Mastic round period door frames that has failed
- Mastic worn away on windows facing the weather
- Gaps between timber frames and stone or brick
Aftercare tips
Simple care keeps the joints in good condition. We recommend:
- Find out about consent before window work on a listed home
- Renew mastic before redecorating the windows
- Avoid patching sand mastic with silicone
- Look over the window mastic once a year
Check the mastic when you check the paintwork. Small cracks are easier to deal with early.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall, so renewing it early is worth it.
Sand mastic for homes and businesses in Northwood
Sand mastic does not last for ever and gaps open up round the frame. We rake it out and renew it and tidies the surround. Typical jobs include mastic worn away on windows facing the weather and old cement repairs round a window that have failed, across sash and case windows, tenement windows and stone surrounds.
In smaller places like Northwood, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. Each frame material needs the right sealant against the right wall.
Every job is covered by a 12-month guarantee, wherever you are in Kent.
- Location
- Northwood (CT12, CT10, CT11)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Frames and glazing around Northwood
Northwood 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. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Schools such as Dame Janet Primary Academy are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. Rented homes near Ramsgate station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Northwood is about 1 mile north-west of Ramsgate, in Kent. Every kind of property in Northwood is covered for sand mastic, old or new, large or small. Every job comes with our 12-month guarantee. Northwood is one of 922 places in Kent we cover. Our Chelmsford page covers work nearby.
All of CT12, CT10 and CT11 is within our area for sand mastic. Sand mastic is available to properties on Gwyn Road, Coxes Lane and Roman Road and the roads around them. With the A254 and A256 close by, Northwood is simple for us to get to for sand mastic. Close by, we work in Ramsgate (1 mile south-east), Upton (1 mile east), St Lawrence (1 mile south), St Peter's (1 mile north-east) and Broadstairs (1 mile north-east). Further out, we also cover Canterbury (15 miles west), Dover (15 miles south), Deal (9 miles south), Herne Bay (12 miles west), Walmer (10 miles south) and Wincheap (15 miles west).
Local landmarks in Northwood
In Northwood, that means homes and buildings near The Derby Arms, The Charles Dickens School and The Royal Harbour Academy. The closest station to Northwood is Ramsgate station, about 0.8 miles south. Nearby you will also find Westwood Cross (0.5 miles north-west) and Ramsgate Museum (1.4 miles south-east). The countryside around Northwood includes Sandwich and Pegwell Bay.
Your questions about sand mastic in Northwood
Will you come out to Northwood?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is sand mastic in a coastal place like Northwood any different?
Near the sea, outside joints face more wind, rain and salt than they would inland, so the choice of sealant and the preparation matter even more. Walls facing the sea are generally the first to need attention.
Can you replace silicone on a period window with sand mastic?
Often, yes. With the silicone removed and the joint cleaned, sand mastic is applied by hand.
Can I add another job to the visit?
Yes. More than one area can go on one quote.
Will the old sealant be removed?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
What does sand mastic cost?
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.
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.
What is sand mastic?
Sand plus a binder based on linseed oil. It’s built up in the joint by hand and shaped to suit the surround.
When it is not the sealant
Sealant isn’t the answer to every problem, and we’ll tell you before we start. It won’t solve:
- Masonry that needs repairing
- Broken panes
- Sashes that rattle, stick or won’t open
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think before you book.
Surfaces we seal
- Tenement windows
- Stone surrounds
- Brick reveals
- Period & listed homes
- Timber door frames
- Sash and case windows
The process
Once we’re on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours per window, depending on the condition of the joints. Parking around Northwood is normally easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Preparing for the visit
- Let us know about parking restrictions
- Mention any leaks or damp you’ve noticed
- Clear items away from the joints we’re working on
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work and send you a clear quote.
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Nearby places to Northwood
Also in Northwood
Surface by surface
Brick reveals
Loose mastic comes out and deep gaps are packed before the new mastic goes in.
Stone surrounds
Old stone surrounds are often uneven, so the gap isn’t the same all the way round. We shape it by hand to follow the stone.
What we’re called out for in Northwood
Over the years, sand mastic weathers. It dries out, cracks and loses its grip from the frame or the masonry.
The most common problems we see are:
- A silicone bead on a sash window that spoils the look
- Mastic round period door frames that has failed
- Patchy fillers round a sash window
- Mastic dropping out of the joint
For an older house near a landmark such as St Mark's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What your quote should include
- How hidden problems are handled
- What product goes in the joint
- Whether all the old sealant comes out first
- What guarantee comes with the work
How we quote for sand mastic
Every job gets its own quote. This is what makes a difference:
- How many areas need sealing
- How much old sealant there is and how hard it is to remove
- Working hours on commercial sites
- How easy the joints are to reach
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re unsure, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
Asking for a quote
There’s no need for technical detail. It helps if you can tell us:
- How we’d reach the joints
- Roughly how big the job is
- A few photos by email, if you can
- If someone has resealed it before
Need a quote? Please phone 0345 464 0079 or drop us an email and tell us about the job. We will explain what we’d do and give you a clear quote before any work starts.
DIY sealant or a professional job?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.