Greater London · England
Sand mastic for sash & case windows in Finsbury Park, Greater London
Sand mastic for Finsbury Park and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Tired mastic found when preparing windows for paint
- Old cement repairs round a window that have failed
- Cracked mastic round a front door frame
Should I try it myself first?
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Sand mastic for homes and businesses in Finsbury Park
We work across Finsbury Park renewing sand mastic on sash windows and doors. Every joint is cleaned out and filled by hand for a neat, traditional finish. We work on sash and case windows, timber door frames and period & listed homes, and people most often call us about a silicone bead on a sash window that spoils the look and window mastic to renew ahead of painting.
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, letting in draughts and water.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Finsbury Park (N4, N7, N5)
- Region
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What sealant work cannot fix
To be straight with you, there are a few things sealant will not fix:
- Sashes that rattle, stick or won’t open
- Broken panes
- Masonry that needs repairing
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Timber door frames
- Period & listed homes
- Brick reveals
- Stone surrounds
- Sash and case windows
- Tenement windows
What we do, step by step
Once we are 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. In Finsbury Park, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- 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.
- We finish the mastic to a tidy line.
Getting ready for the visit
- Clear the area around the work
- Let us know about stairs, lifts or work at height
- Let us know about earlier repairs to the joints
Get a quote
Want a quote for sand mastic? Please phone 0345 464 0079 or email us with a few details. We will explain what we’d do and send you a clear quote before work begins.
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Questions from Finsbury Park
Do you cover Finsbury Park for sand mastic?
Yes, Finsbury Park is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Can you help a landlord with a rental near Finsbury Park station?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
What guarantee comes with the work?
Our 12-month guarantee applies on every job.
What is sand mastic?
A traditional pointing material made from sand and a linseed-oil-based binder for the joint between timber frames and masonry.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us, and we’re fully insured.
Do you offer different sealant colours?
Usually, yes. Sealants come in white, clear, grey and other colours, and we’ll agree it with you first.
Can I do it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
Are you fully insured?
Yes. We’re fully insured, with over 20 years’ experience in sealant work.
Also near Finsbury Park
Also in Finsbury Park
Finsbury Park homes and the weather
With historic houses such as Witanhurst (about 2.1 miles west) nearby, there’s older building stock in the area around Finsbury Park as well as newer homes. 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 booking.
If you live in an older home near St John the Evangelist, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Letting a property close to Finsbury Park station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about.
Finsbury Park is about 1 mile north of Highbury, in Greater London. Finsbury Park gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. 764 places in Greater London are on our list.
Here we cover the N4, N7 and N5 postcode area for sand mastic. If you need sand mastic at a property on Prah Road, Swan Lane and Moray Road or anywhere close by, we can help. Main roads around Finsbury Park include the A1201, which makes travel easy. If you’re just outside Finsbury Park, we cover Stroud Green (1 mile north-west), Nag's Head (1 mile south-west), Holloway (1 mile south-west), Crouch End (1 mile north-west) and Upper Holloway (1 mile west). Further out, we also cover London (5 miles south), City of Westminster (4 miles south-west), Marylebone (4 miles south-west), Kensington (6 miles south-west), St Pancras (3 miles south) and Shoreditch (3 miles south).
Local landmarks in Finsbury Park
Around Finsbury Park, our work takes us to homes and buildings near Stationers Park, The Sir George Robey pub and Woodberry Down School, among other places. Nearby too are Church of St Andrew (1 mile east) and Arts and Media School Islington (0.6 miles west). There’s a railway station in Finsbury Park itself: Finsbury Park station. Well-known places in the area include Arsenal Football Club Museum (0.8 miles south) and Montfichet's Tower (3.8 miles south). For a walk, there’s Highgate Hill and Railway Fields.
Do you need sand mastic in Finsbury Park?
Some old mastic was never deep enough. Mastic that is too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
Most people get in touch after spotting something like this:
- Gaps round a timber door in stone or brick
- Draughty sash windows at the surround
- Old cement repairs round a window that have failed
- Mastic worn away on windows facing the weather
For site and facilities teams at buildings such as Stroud Green Primary School, its window and door frames need their mastic kept sound, just like a home’s.
What your quote should include
- How the joint is cleaned and prepared
- How the colour is chosen
- Whether they seal over old material or remove it
- How long the guarantee is
How we quote for sand mastic
We don’t publish a price list. The quote depends on:
- The size of the job
- Mould in or behind the old joints
- When we can work, for business premises
- How many rooms, windows or areas are involved
Doing several joints on 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.
What we need to know
When you call or email, it’s useful to know:
- Whether it’s a home or a business
- How many joints, rooms or windows are involved
- What the problem is, such as mould, gaps, leaks or cracking
- A few photos by email, if you can
Every job is quoted individually. Simply ring 0345 464 0079 or email us and describe the job and send photos if you have them.
Why deal with it now?
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. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why Finsbury Park 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
- 20+ years of sealant experience
Take a look at our cost guide or customer reviews.
How the job changes by surface
Period and listed homes
Period homes look their best with traditional materials, and sand mastic is one of them.
Brick reveals
We rake out the old mastic and pack deep voids before the new mastic goes in.