Greater London · England
Sand Mastic in Kings Cross
Professional sand mastic in and around Kings Cross, with old sealant always removed completely and a 12-month guarantee.
- Wind and rain getting in round a sash window
- Window mastic to renew ahead of painting
- Weathered mastic on the most exposed windows
About our sand mastic in Kings Cross
A silicone bead around a sash window can look out of place and does not suit the building. Sand mastic gives a finish that matches the age of the house and we can swap the silicone for it. We work on period & listed homes, stone surrounds and brick reveals, and the jobs we see most are mastic worn away on windows facing the weather and cracked mastic round a front door frame.
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 Kings Cross.
Big or small, you get the same 12-month guarantee in Kings Cross and across Greater London.
- Where
- Kings Cross (NW1W, NW1, N1)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
When it is not the sealant
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Masonry that needs repairing
- Cracked or broken glass
- Whether work needs listed building consent
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Joints and surfaces we work on
- Brick reveals
- Sash and case windows
- Tenement windows
- Stone surrounds
- Period & listed homes
- Timber door frames
Windows and doors in Kings Cross
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Dr Johnson's House (about 1.2 miles south-east) nearby, there’s older building stock in the area around Kings Cross 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.
Rented homes near London Kings Cross station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out. For site and facilities teams at buildings such as Argyle Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Kings Cross is about 1 mile north-west of St Pancras, in Greater London. Homes, rented property, offices and hotels in Kings Cross can book us for sand mastic, old or new, large or small. Every job comes with our one-year guarantee. 764 places in Greater London are on our list, large and small.
Here we cover the NW1W, NW1 and N1 postcode area for sand mastic. Whether your property is on Euston Road, Duke's Road and Phoenix Road or a nearby road, we can help. Main roads around Kings Cross include the A501 and A4200, which makes travel easy. We also cover the places around Kings Cross: Somers Town (1 mile west), St Pancras (1 mile south-east), Euston (1 mile south-west), Bloomsbury (1 mile south) and Agar Town (1 mile north-west). Within a short drive, we also cover Kensington (4 miles south-west), Walthamstow (6 miles north-east), Whitechapel (3 miles east), Hampstead (3 miles north-west), Ruislip (13 miles west) and Brompton (3 miles south-west).
Around Kings Cross
We work in homes and buildings around The Fellow pub, Lewis Cubitt Park and Pilsudski Institute of London, among other places. You will also find Regent High School (0.5 miles north-west) and The Poor School (under half a mile east). There’s a railway station in Kings Cross itself: London Kings Cross station. Well-known places in the area include Sartorial Contemporary Art (less than half a mile south-east) and Brunswick Centre (under half a mile south). Open spaces near Kings Cross include St. James's Park Lake and Ludgate Hill.
FAQs for Kings Cross
Is Kings Cross in your area for sand mastic?
Yes, Kings Cross is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing.
Is parking an issue for sand mastic in Kings Cross?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Where is Mr Mastic based?
We’re a Crawley-based firm. Our area covers South East England, London and Scotland.
Is there any odour?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
Do you offer different sealant colours?
Usually, yes. White, clear and grey are common, and other colours are available, and we will agree it with you first.
How long does the job take?
It depends on the size of the job, but as a guide it takes a few hours per window, depending on the condition of the joints. We will tell you when we quote.
Do I need permission for sand mastic on a listed building?
Check with your local planning authority. They decide whether consent is needed.
I rent my home. Can I book you?
Of course. Ask your landlord first, and we can send them the quote if that helps.
Leave it or put it right?
If you’re redecorating, renew the mastic first. Painting over failed mastic doesn’t seal it, and the new mastic is traditionally left unpainted. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Kings Cross, the repair is bigger than a sealant job.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs. Ask us for a quote and we will explain what it covers.
Why book with us
- 20+ years of sealant experience
- Approved under the ARBOMaster scheme
- Quality sealants from Arbo and Everbuild
- 180+ five-star Google reviews
See our cost guide and our reviews.
Also near Kings Cross
Other services in Kings Cross
Should I try it myself first?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again.
How it works
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and clear up. Most jobs take a few hours per window, depending on the condition of the joints. In Kings Cross, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Mention any sign-in or site rules at work premises
- Let us know if you’ve seen damp or leaks
- Keep pets and children clear of the area while we work
Ask for a quote
Want a quote for sand mastic? Please call 0345 464 0079 or send us an email and tell us about the job. We will explain what we’d do and give you a clear price before any work starts.
Advice
Landlord and commercial work in Kings Cross
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will give you a quote.
We work for letting agents and landlords as well as homeowners. Sealant work between tenants keeps a property looking cared for.
What we’re called out for in Kings Cross
Rain on the window surround works into any crack and pushes it out. Exposed elevations usually fail first.
People normally contact us when they notice one of these:
- Mastic that needs renewing before redecorating
- Modern sealant on a period surround
- Patchy fillers round a sash window
- Mastic dropping out of the joint
If you live in an older home near Holy Cross Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Comparing quotes
- How the joint is cleaned and prepared
- What the cure time is
- What the quote includes, VAT included or not
- Whether the sealant suits the joint
What affects the quote in Kings Cross
Call for a quick quote. What matters most is:
- The amount of work
- Whether old sealant or filler has to be cut out
- Any working-time requirements on site
- The number of rooms or windows
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What to tell us for a quote
To make quoting easier, let us know:
- Whether it’s a home or a business
- How many joints, rooms or windows are involved
- The problem you’ve noticed
- Pictures of the joints, sent by email
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that’s easy.