Greater London · England
Sand mastic for sash & case windows in St Pancras, Greater London
Problem with your window and door surrounds in St Pancras? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Modern sealant on a period surround
- Old cement repairs round a window that have failed
- Open joints round the window box
What we can’t put right
We won’t take on work that will not last, so these are the limits:
- Broken panes
- Sash cords, weights and draught-proofing of the sashes
- Timber that has rotted
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly before booking.
Where we work in St Pancras
- Tenement windows
- Brick reveals
- Stone surrounds
- Sash and case windows
- Timber door frames
- Period & listed homes
Sand mastic in St Pancras, done properly
Traditional burnt sand mastic that sits naturally against stone and brick. It suits period and listed homes, where modern sealant can look out of place. Typical jobs include gaps between timber frames and stone or brick and wind and rain getting in round a sash window, across tenement windows, timber door frames and sash and case windows.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, letting in draughts and water.
We stand behind the work with a 12-month guarantee, so you’re not left on your own once the job is done.
- Place
- St Pancras (NW1W, W1T, N1)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
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 tidy away. Most jobs take anything from a few hours to a full day, depending on how many windows. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in St Pancras. 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.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Before we arrive
- Let us know about stairs, lifts or work at height
- Mention any parking rules near the property
- For business premises, tell us about site rules or sign-in
How to get a quote
To get a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We will give you a clear quote before any work starts.
Advice
Nearby places to St Pancras
Also in St Pancras
DIY sealant or a professional job?
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 doesn’t work out, we can still put it right.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
For landlords and businesses
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote, and we’re fully insured for the work.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can go on one quote.
Windows and doors in St Pancras
With historic houses such as Dr Johnson's House (about 0.9 miles south-east) nearby, there’s older building stock in the area around St Pancras as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
St Pancras is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Homes close to Lumen United Reformed Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
St Pancras is about 2 miles north-west of London, in Greater London. Homes, rented property, offices and hotels in St Pancras can book us for sand mastic. Every job comes with our 12-month guarantee. St Pancras is one of 764 places in Greater London where we work.
Jobs for sand mastic in NW1W, W1T and N1 is quoted and booked the same way as anywhere else. Whether your property is on Shoe Lane, Long Lane and City Road or a nearby road, our applicators can take on the job. You’ll find St Pancras on the A4 and A40, which makes it straightforward to reach with everything needed for sand mastic. Neighbouring places we cover for sand mastic include Bloomsbury (1 mile south-west), Kings Cross (1 mile north-west), Holborn (1 mile south-east), Clerkenwell (1 mile east) and Angel (1 mile north-east). Larger places within reach include Kensington (4 miles south-west), Walthamstow (6 miles north-east), Hampstead (3 miles north-west), Ruislip (13 miles west), Brompton (3 miles south-west) and Stockwell (4 miles south). St Pancras is one of the larger places we cover in Greater London.
Landmarks near St Pancras
We work in homes and buildings around Lincoln's Inn Fields, City Academy and Elizabeth Garrett Anderson School and the streets around them. Nearby too are Pilsudski Institute of London (within half a mile south-west) and Calthorpe Arms Public House (under half a mile south-east). St Pancras’s nearest station is London Kings Cross station, about 0.5 miles north-west. Nearby you will also find Montfichet's Tower (1.1 miles south-east) and Royal National Throat (within half a mile north). Green spaces nearby include Barnsbury Wood and Ludgate Hill.
Common problems we fix in St Pancras
Over the years, sand mastic weathers. It hardens, cracks and starts to come away on the stone or timber.
If you can see any of these, it’s time to have the joints looked at:
- Mastic dropping out of the joint
- Gaps round a timber door in stone or brick
- Patchy fillers round a sash window
- Gaps where the frame meets the masonry
If you let a flat or house near London Kings Cross station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Before you book anyone
- How hidden problems are handled
- When the joint can take water or movement
- The length of the guarantee
- Which colour the sealant will be
Common questions in St Pancras
Can you help a landlord with a rental near London Kings Cross station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before work begins.
Can you do sand mastic in St Pancras?
Yes. We work across London and the South East, and St Pancras is part of that. You can phone 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear price.
Where do you work from?
We’re a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Is it possible to take out silicone and use sand mastic instead?
In most cases. The silicone is cut out and the joint cleaned before the sand mastic goes in.
Can you work on commercial sites?
Yes. We’ve worked for hotels, offices and other businesses and we are fully insured.
Is there any odour?
It depends on the product. Some smell for a while, some hardly at all.
Can you seal over the old sealant?
No, it won’t last. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Quotes for sand mastic in St Pancras
You’ll get a clear quote before we start. It takes into account:
- How easy the joints are to reach
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
- Any working-time requirements on site
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. You’ll know the price before we begin.
What to tell us for a quote
There’s no need for technical detail. It helps if you can tell us:
- A few pictures by email, if you can
- Where the property is
- If it’s domestic, commercial or a hotel
- What’s wrong with the joints now
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job.
Why it’s worth doing now in St Pancras
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic will not stop the gaps, and the new mastic is traditionally left unpainted. 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 for homes in St Pancras.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why St Pancras customers choose us
- 4.9 on Google from 180+ five-star reviews
- Trusted Arbo and Everbuild sealants
- 20+ years of sealant experience
- We never seal over old sealant
See what affects the cost or our reviews.