Greater London · England
Sand mastic for sash & case windows in Holborn, Greater London
Specialist sand mastic for Holborn: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Mastic round period door frames that has failed
- A silicone bead on a sash window that spoils the look
- Weathered mastic on the most exposed windows
How we handle sand mastic in Holborn
Sand mastic does not last for ever and gaps open up round the frame. Renewing it closes the gap and tidies the surround. Typical jobs include old sand mastic that has cracked, crumbled or fallen out and a silicone bead on a sash window that spoils the look, on period & listed homes, brick reveals and tenement windows.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. The mastic around them dries out and cracks with age, letting in draughts and water.
A one-year guarantee comes as standard, so you are covered after we’ve gone.
- Where
- Holborn (WC1X, WC1N, EC1R)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
FAQs for Holborn
Can you help a landlord with a rental near Farringdon station?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or send us an email and tell us about the property, and we will send you a clear quote.
Is Holborn in your area for sand mastic?
Yes. Our work covers London and the South East, and Holborn is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we will send you a clear quote.
Do I have to be there?
We need access to the joints, so we’ll agree that with you when we book. For inside work, that normally means someone being in.
What guarantee comes with the work?
Every job comes with our 12-month guarantee.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status.
Will it make a mess?
Tidy work is part of the job. Nearby surfaces are protected, and we clear up when we are done.
Are you fully insured?
Yes, we are fully insured.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We explain the product when we quote.
Leave it or put it right?
Before painting the windows, it pays to renew the mastic. Painting over failed mastic does not seal it, and the new mastic is traditionally left unpainted. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Holborn, the repair is bigger than a sealant job.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or drop us an email.
Why book with us
- 12-month guarantee on every job
- Old sealant always removed completely
- An ARBOMaster approved applicator
- Anti-fungal silicone where joints get wet
Take a look at what affects the cost or our reviews.
Landlords, agents and businesses in Holborn
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Nearby places to Holborn
Other services in Holborn
How the job changes by surface
Stone surrounds
Sand mastic sits naturally against stone. It finishes to look like part of the surround.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair, so check who is responsible first.
Frames and glazing around Holborn
Historic houses like Dr Johnson's House (about 0.4 miles south-east) are a reminder that the area around Holborn has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
Holborn is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Homes close to St Alban's Church include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Letting a property close to Farringdon station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Holborn is about 2 miles north-west of London, in Greater London. If you need sand mastic in Holborn, please call 0345 464 0079 or drop us an email for a quick quote. We cover Greater London from our Crawley base, Holborn included. Our area takes in 764 places across Greater London, from the larger towns to small villages.
Work in WC1X, WC1N and EC1R works the same way as everywhere else we cover. You will find streets such as Shoe Lane, Drury Lane and New Square. You’ll find Holborn 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 Farringdon (1 mile east), St Pancras (1 mile north-west), Clare Market (1 mile south), Smithfield (1 mile east) and Temple Bar (1 mile south). We also work in nearby towns such as Kensington (4 miles west), Walthamstow (6 miles north-east), Hampstead (4 miles north-west), Ruislip (13 miles west), Brompton (3 miles south-west) and Stockwell (4 miles south).
Around Holborn
Locally, jobs take us to homes and businesses close to The Yorkshire Grey pub, British Library of Political and Economic Science and City Academy and the streets around them. Other local landmarks include Elizabeth Garrett Anderson School (0.9 miles north) and Lincoln's Inn Fields (within half a mile south-west). Holborn has its own railway station: Farringdon station. Other landmarks nearby include Montfichet's Tower (0.7 miles south-east) and Brunswick Centre (0.5 miles north-west). For a walk, there’s Barnsbury Wood and Ludgate Hill.
What happens on the day
When we arrive, we start by going over the job with you. We protect the surfaces around the joints before any work begins. The work usually takes 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 Holborn. It helps if you can point us to a visitor permit or a bay close to the door.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Before we arrive
- Let us know about stairs, lifts or work at height
- Let us know if you’ve seen damp or leaks
- Clear items away from the joints we are working on
Ask for a quote
Getting a quote is simple: tell us what needs doing and where. A few photos by email make the job easier to understand, and we will take it from there.
Read more
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
If you’re 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 does not work out, we can still put it right.
Looking after it afterwards
So the new joints stay in good condition:
- Inspect the joints round the windows every year or so
- Go gently near the mastic when preparing windows
- Sort the mastic before the decorators arrive
- Clear gutters so water doesn’t pour onto the windows
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall so early renewal protects both.
When it isn’t the sealant
We will always be straight with you, so here’s what sealant can’t fix:
- Decisions on consent for listed homes
- Rotten sashes, sills or window boxes (a joiner’s job)
- Sash cords, weights and draught-proofing of the sashes
If you’re not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer.
Where we work in Holborn
- Period & listed homes
- Timber door frames
- Brick reveals
- Stone surrounds
- Tenement windows
- Sash and case windows