Greater London · England
Sand mastic for sash & case windows in Lower Holloway, Greater London
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Lower Holloway, with a one-year guarantee on every job. Ask us for a quote.
- Silicone on a period window that looks wrong
- Tired mastic found when preparing windows for paint
- Draughty sash windows at the surround
About our sand mastic in Lower Holloway
Across Lower Holloway, 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 gaps round a timber door in stone or brick and mastic worn away on windows facing the weather, across timber door frames, tenement windows and brick reveals.
Many London homes are flats, with windows high above the street. Who looks after the outside of the frames can depend on the lease, so check that first.
All our work is covered by our one-year guarantee, wherever you are in Greater London.
- Where
- Lower Holloway (N7, N1, N5)
- Region
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. A few tips:
- Get any rot dealt with first
- Plan mastic work ahead of painting
- Don’t paint over the new mastic
- Avoid heavy scraping on the mastic joint
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
Windows and doors in Lower Holloway
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Witanhurst (about 2 miles north-west) nearby, there’s older building stock in the area around Lower Holloway as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you let a flat or house near Caledonian Road & Barnsbury station, cracked sand mastic around sash windows lets in the draughts tenants complain about. Homes close to St David include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. Managing a site like Sacred Heart Catholic Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Lower Holloway is about 2 miles north of St Pancras, in Greater London. Jobs in Lower Holloway get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Lower Holloway is one of 764 towns and villages in Greater London where we work.
Our applicators cover all of N7, N1 and N5 for sand mastic and the streets around it. That includes homes and businesses on Penn Road, Cliff Road and Lough Road. You will find Lower Holloway on the A5203, so it’s easy for us to get to with everything needed for sand mastic. We also cover the places around Lower Holloway: Barnsbury (1 mile south), Holloway (1 mile north), Nag's Head (1 mile north), Tufnell Park (1 mile north-west) and Islington (1 mile south-east). Further out, we also cover London (4 miles south), City of Westminster (3 miles south-west), Marylebone (3 miles south-west), Kensington (5 miles south-west), Walthamstow (5 miles north-east) and Whitechapel (3 miles south-east).
Near you in Lower Holloway
In Lower Holloway, that means homes and buildings near St Mary Magdalene Gardens, Musical Theatre Academy and St Mary Magdalene Academy and the streets around them. Nearby too are Vaughan Williams Memorial Library (1.6 miles south-west) and The Lamb Tavern Public House (less than half a mile west). The closest station to Lower Holloway is Caledonian Road & Barnsbury station, roughly 0.5 miles south of the centre. Other landmarks nearby include Arsenal Football Club Museum (0.6 miles north-east) and Montfichet's Tower (2.6 miles south). The countryside around Lower Holloway includes Dartmouth Park Hill and Barnsbury Wood.
Leave it or put it right?
Not every draught comes from the sashes themselves. Gaps between the frame and the wall can be just as bad and new mastic seals them. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble for homes in Lower Holloway.
Combining jobs into one visit usually makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
Why Lower Holloway clients choose us
- A 12-month guarantee on all work
- Sanitary silicone with an anti-fungal additive in wet areas
- We leave the area clean and tidy
- Rated 4.9 stars on Google
Read our cost guide and what customers say.
Work for landlords, hotels and businesses
Failed sealant is one of the commonest items on a check-out report. Several properties can be quoted together.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
Places near Lower Holloway
More services for Lower Holloway
What happens on the day
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and tidy away. It normally takes a few hours for a single window, longer for several. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Lower Holloway. It helps if you can point us to a visitor permit or a bay close to the door.
- First we agree which joints need doing.
- 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
- Clear items away from the joints we are working on
- Let us know about earlier repairs to the joints
- Keep children and pets away from the work area
How to get a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work and send you a clear quote.
Advice
How the job changes by surface
Sash and case windows
On a sash window, the mastic joint shows on the outside, so a neat, even finish matters.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair so it’s worth checking responsibilities.
Can I do it myself?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Lower Holloway questions
Is Lower Holloway in your area for sand mastic?
Yes. Our work covers London and the South East, and Lower Holloway is part of that. You can ring 0345 464 0079 or drop us an email and let us know what needs doing.
Can you help a landlord with a rental near Caledonian Road & Barnsbury station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.
Can you seal over the old sealant?
No, because it fails. The old sealant always comes out first, so the new sealant bonds properly.
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.
What should I tell you?
A short description and the location, with pictures by email if possible. If we need more, we’ll ask.
When will the new mastic be hard?
A skin forms quite soon, but full hardening takes longer. We’ll explain what to expect before we leave.
Do you guarantee sand mastic work?
Our 12-month guarantee applies on every job.
Where do you work from?
We are based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
What affects the quote in Lower Holloway
The price is agreed before any work begins. It’s based on:
- The amount of work
- Whether old sealant or filler has to be cut out
- Access and height
- How many rooms, windows or areas are involved
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first and agree the price before starting.
Asking for a quote
When you call or email, these details help:
- Roughly how big the job is
- The address or postcode of the job
- Whether it’s a home or a business
- The problem you’ve noticed
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. Whenever you’re ready, phone 0345 464 0079 or send us an email.