Medway · England
Sand mastic for sash & case windows in Grange, Medway
Professional sand mastic in and around Grange, with old sealant always removed completely and a 12-month guarantee.
- Patchy fillers round a sash window
- Modern sealant on a period surround
- Cracked mastic round a front door frame
Sand mastic in Grange
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. Typical jobs include open joints round the window box and cracked mastic round a front door frame, across sash and case windows, timber door frames and brick reveals.
In a village or hamlet like Grange, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Location
- Grange (ME7, ME8)
- Region
- Medway
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
When it isn’t the sealant
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Planning or listed building consent (your local planning authority decides)
- Sash cords, weights and draught-proofing of the sashes
- Decayed frames that need repair
If you’re not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.
Where we work in Grange
- Brick reveals
- Timber door frames
- Period & listed homes
- Sash and case windows
- Tenement windows
- Stone surrounds
Leave it or put it right?
Silicone might seem the quicker option, but it can look wrong on a period surround. Sand mastic is the traditional material and finishes neatly against the masonry. Older cottages and farmhouses around Grange can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we will explain what it covers.
Why us?
- Sanitary silicone with an anti-fungal additive in wet areas
- Every job guaranteed for a year
- An ARBOMaster approved applicator
- Tidy, careful work
Read what affects the cost or customer reviews.
Quotes for sand mastic in Grange
Your quote is based on your job. We look at:
- Whether there’s mould to deal with
- Access and height
- Which sealant suits the joint
- How many areas need sealing
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
What we need to know
To help us quote quickly, let us know:
- Access, such as stairs, a lift or height
- Where the property is
- Whether it’s a home or a business
- How many joints, rooms or windows are involved
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. When it suits you, ring 0345 464 0079 or send us an email.
What we are called out for in Grange
Water gets into small cracks in the mastic and pushes it out. Windows facing the weather tend to go first.
Any of these means the joints need attention:
- Mastic dropping out of the joint
- Cracked mastic round a front door frame
- Draughts and rain around sash boxes
- Tired mastic found when preparing windows for paint
In the older streets around Church of St Mary Magdalen, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before you book anyone
- Who turns up on the day
- What the cure time is
- What preparation is included
- Whether they’re fully insured
Windows and doors in Grange
Grange is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is 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.
Managing a site like Woodlands Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. Rented homes near Gillingham (Kent) station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Grange is about 1 mile north of Gillingham, in Medway. Wherever you are in the ME7 postcode area, we cover sand mastic for homes and businesses. Grange is one of 68 places in Medway we cover for sand mastic. We also work in Chelmsford, around 25 miles away.
Every address in ME7 and ME8 is within our area for sand mastic. If you need sand mastic at a property on Grange Road, Lower Featherby Road and Odo Rise or a nearby road, we can help. Close by, we work in Lower Twydall (1 mile south-east), Twydall (1 mile south), Gillingham (1 mile south), Darland (2 miles south-west) and Hale (2 miles south-west). Within a short drive, we also cover Chatham (3 miles south-west), Rochester (4 miles west), Strood (4 miles west), Park Wood (3 miles south), Lordswood (4 miles south-west) and Hoo St Werburgh (3 miles north).
Around Grange
We work in homes and buildings around The Robert Napier School, Our Lady of Gillingham Church and Riverside Country Park. Also close by are The Hastings Arms (under half a mile north-west) and The Robert Napier School (1.1 miles south-west). For rail, the closest station is Gillingham (Kent) station, roughly 1.3 miles west. Other landmarks nearby include Huguenot Museum (3.3 miles west) and Pentagon Shopping Centre (2.4 miles west). For a walk, there’s Bishop Saltings.
The process
At the end, we look at the finished work together and explain the cure time. The work normally takes a few hours per window, depending on the condition of the joints, depending on how much there is to do. Somewhere like Grange needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Keep pets and children clear of the area while we work
- Tell us about any water getting in
- Move anything stored near the joints
Ask for a quote
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
Read more
Grange questions
Do you work for landlords with property near Gillingham (Kent) station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear quote.
Does the coastal weather in Grange affect outside sealant?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. The right product, a clean joint and the right depth all help it cope.
Should I use sand mastic or silicone?
We will help you decide. Period homes often look best with sand mastic, and modern sealants suit newer frames.
What exactly is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status.
Where do you work from?
Our base is in Crawley, and we work across South East England, London and Scotland.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Do you come to Grange?
Yes. We are based in Crawley and work across South East England, London and Scotland, and that includes Grange.
Places near Grange
More services for Grange
Landlord and commercial work in Grange
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Looking after it afterwards
Simple care keeps the joints in good condition. We recommend:
- Ask us before painting near the mastic
- Inspect the joints round the windows every year or so
- Check with your local planning authority if your home is listed
- Avoid patching sand mastic with silicone
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.