Greater London · England
Islington Sand Mastic
Sand mastic across Islington and nearby, with old sealant always removed completely and a 12-month guarantee.
- Mastic that needs renewing before redecorating
- Silicone on a period window that looks wrong
- Mastic dropping out of the joint
About our sand mastic in Islington
Across Islington, we renew sand mastic around sash and case windows. Every joint is cleaned out and filled by hand, finished to suit the masonry. Common call-outs are for patchy fillers round a sash window and a silicone bead on a sash window that spoils the look, on stone surrounds, tenement windows and period & listed homes.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, which is when draughts and damp patches appear in homes in Islington.
All of our work is guaranteed for twelve months, in Islington and everywhere else we cover.
- Place
- Islington (N1, N7, NW1, EC1V)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Quotes for sand mastic in Islington
Call for a quick quote. What matters most is:
- The product the joint needs
- Access and height
- The number of rooms or windows
- Mould in or behind the old joints
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
Helping us quote
Before you ask for a quote, have a think about:
- The type of property
- The address or postcode of the job
- Roughly how big the job is
- Any access issues, like height or stairs
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved and give you a clear quote.
DIY versus a professional finish
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Honest limits
To be straight with you, some problems need a different trade:
- Putty and glazing repairs
- Whether work needs listed building consent
- Sashes that need overhauling
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think.
Where we work in Islington
- Stone surrounds
- Tenement windows
- Brick reveals
- Timber door frames
- Sash and case windows
- Period & listed homes
Islington questions
Can you help a landlord with a rental near Essex Road station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before work begins.
Is Islington in your area for sand mastic?
Yes. Our work covers London and the South East, and Islington is part of that. You can phone 0345 464 0079 or send us an email and tell us what needs doing.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
How long does the job take?
It depends on the size of the job, but as a guide it takes anything from a few hours to a full day, depending on how many windows. We’ll tell you when we quote.
Can I add another job to the visit?
Yes. Just list everything you need and you will get one quote.
Do the sealants smell?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
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.
Is it possible to take out silicone and use sand mastic instead?
Yes, we do this often. All the old silicone is removed first so the mastic can sit properly.
Sand mastic in Islington: local notes
Historic houses like Dr Johnson's House (about 1.6 miles south) are a reminder that the area around Islington has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. In a converted house or block, who looks after the windows depends on the lease, so check that before you book.
In the older streets around St Mary's Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Islington is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Islington is about 3 miles north-east of City of Westminster, in Greater London. If you need sand mastic in Islington, it’s easy to get a quote: please ring 0345 464 0079 or drop us an email. We cover Greater London from our Crawley base. Islington is one of 764 towns and villages in Greater London where we work for sand mastic.
Here we cover the N1, N7, NW1 and EC1V postcode area for sand mastic. Whether your property is on Gibson Square, Old Royal Free Square and Cloudesley Square or a nearby road, our applicators can take on the job. Islington sits on or near the B515 and A5203. We also cover the places around Islington: Pentonville (1 mile south), Angel (1 mile south), Barnsbury (1 mile north-west), Clerkenwell (1 mile south) and Lower Holloway (1 mile north-west). We also work in nearby towns such as London (3 miles south), City of Westminster (3 miles south-west), Kensington (5 miles south-west), Walthamstow (5 miles north-east), Hampstead (3 miles west) and Ruislip (13 miles west).
Near you in Islington
Typical jobs here are in homes near Islington Green School, The King's Head Public House and Pilsudski Institute of London and the streets around them. You’ll also find Barnard Park (within half a mile south-west) and St Mary's CofE Primary School (less than half a mile east). Islington has its own railway station: Essex Road station. Other landmarks nearby include King's College Hospital Charity (0.7 miles north-west) and Montfichet's Tower (1.7 miles south). Open spaces near Islington include Barnsbury Wood and Ludgate Hill.
What happens on the day
Once we are on site, we check the joints match what you told us. 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. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
How to prepare
- Try not to wet indoor joints just before the visit
- Tell us if parking is tricky
- Keep pets and children clear of the area while we work
Ask for a quote
For sand mastic in Islington, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you’ll get a clear quote before any work starts.
Read more
For landlords and businesses
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can go on one quote.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Towns and villages near Islington
More services for Islington
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Inspect the joints round the windows every year or so
- Have rotten timber repaired before new mastic goes in
- Avoid heavy scraping on the mastic joint
- Don’t paint over the new mastic
Don’t touch or press the mastic while it hardens. It skins over quickly, but takes longer to harden fully.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry so early renewal protects both.
Common problems we fix in Islington
Scraping and sanding before painting can loosen old mastic. Many people find it crumbling when they prepare the windows, which is a good time to renew it.
Common reasons people contact us include:
- Cement or filler used on old window joints that has cracked
- Gaps between timber frames and stone or brick
- Gaps round a timber door in stone or brick
- Mastic dropping out of the joint
Letting a property close to Essex Road station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about.
What your quote should include
- Whether all the old sealant comes out first
- What guarantee comes with the work
- What product goes in the joint
- Whether you can choose the colour