Medway · England
Sand mastic for sash & case windows in North Street, Medway
Window and door surrounds in North Street need attention? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Old cement repairs round a window that have failed
- Crumbling sand mastic round a window
- Gaps round a timber door in stone or brick
Sand mastic in North Street, done properly
For a listed home or one in a conservation area, ask your local planning authority whether consent is needed for work to windows. Sand mastic is often favoured as a like-for-like material. If you have old sand mastic that has cracked, crumbled or fallen out and modern sealant on a period surround, we can help.
Around North Street, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Place
- North Street (ME3)
- Wider area
- Medway
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
How we quote for sand mastic
We do not publish a price list, because no two jobs are the same. What we look at:
- How many rooms, windows or areas are involved
- The type of sealant required
- Access and height
- Working hours on commercial sites
What you pay reflects the work, not guesswork. That is why we ask a few questions first.
Asking for a quote
You do not need to know the technical terms. Just tell us:
- Roughly how big the job is
- Pictures of the joints, sent by email
- Whether it’s a home or a business
- The address or postcode of the job
We don’t publish a price list. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or send us an email.
Landlords, agents and businesses in North Street
In hotels, rooms out of use cost money, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.
Letting agents often deal with us directly. Tell us the address, the job and how access works.
Leave it or put it right?
Gaps round a sash window let in rain and draughts. Water can get to the frame and the masonry so renewing it early protects the window. Older cottages and farmhouses around North Street can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
What it costs depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before we start, so you know where you stand.
Why us?
- 4.9 on Google from 180+ five-star reviews
- Anti-fungal silicone where joints get wet
- We never seal over old sealant
- ARBOMaster approved applicator
Read our cost guide and what customers say.
Also near North Street
More services for North Street
Frames and glazing around North Street
North Street is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. 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.
Letting a property close to Gillingham (Kent) station? Then any sash windows need sound mastic to keep draughts and rain out.
North Street is about 5 miles north of Gillingham, in Medway. If you need sand mastic in North Street, please phone 0345 464 0079 or send us an email for a quick quote. We’re based in Crawley and cover Medway. Our area takes in 68 places across Medway. There’s also a page for Chelmsford, about 21 miles away.
Jobs for sand mastic in ME3 works the same way as everywhere else we cover. If you’re just outside North Street, we cover Tunbridge Hill (1 mile south-west), Kingsnorth (1 mile south), Stoke (1 mile north-east), Fenn Street (1 mile north-west) and Sharnal Street (1 mile west). Within a short drive, we also cover Gillingham (5 miles south), Chatham (7 miles south-west), Rochester (6 miles south-west), Rainham (5 miles south), Strood (6 miles south-west) and Luton (6 miles south-west).
Landmarks near North Street
In North Street, that means homes and buildings near The White Horse pub, among other places. North Street’s nearest station is Gillingham (Kent) station, about 4.2 miles south-west. Nearby you will also find Medway Maritime Hospital (4.9 miles south-west) and Upnor Castle (4 miles south-west). Not far away are Bishop Saltings.
Keeping the joints in good condition
A little care helps the new joints last. We recommend:
- Ask a joiner to look at soft timber first
- Do not run silicone over sand mastic
- Clear gutters so water does not pour onto the windows
- Go gently near the mastic when preparing windows
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger.
What we do, step by step
When we arrive, we start by going over the job with you, so there are no surprises. Surfaces next to the work are protected before any work begins. Most jobs take a few hours per window, depending on the condition of the joints. In a small place like North Street, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- Mention if the joints have been sealed before
- Move anything stored near the joints
- Tell us if parking is tricky
Get a quote
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. Photos by email help us understand the job.
Read more
DIY versus a professional finish
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Your questions about sand mastic in North Street
Does the coastal weather in North Street affect outside sealant?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. Walls facing the sea are normally the first to need attention.
Is North Street within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can landlords and businesses book you?
Yes, we do. Domestic, commercial and hotel work are all part of what we do, and we are fully insured.
What’s sand mastic made of?
A traditional pointing material made from sand and a linseed-oil-based binder, used between timber frames and stone or brick.
Should I try DIY first?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Do I need to be at home?
That depends on where the joints are. Inside work needs someone to give us access, and for outside work we will agree access with you when we book.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Can I add another job to the visit?
Of course. Doing several areas at once is normally more efficient, so mention them when you ask for a quote.
When to call us in North Street
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows.
It’s worth asking for a quote if you see:
- Draughty sash windows at the surround
- Cement or filler used on old window joints that has cracked
- Gaps where the frame meets the masonry
- Mastic round period door frames that has failed
If you live in an older home near Church of St Peter and St Paul, 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
- How the colour is chosen
- When the joint can take water or movement
- Whether VAT is included