Greater London · England
St Luke's Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in St Luke's, with a 12-month guarantee on every job. Call for a quick quote.
- Mastic round period door frames that has failed
- Open joints round the window box
- Wind and rain getting in round a sash window
Sand mastic in St Luke's, done properly
If your home is listed or in a conservation area, check with your local planning authority whether consent is needed for work to windows. Like-for-like sand mastic is often the preferred finish. We are often asked to deal with weathered mastic on the most exposed windows and cement or filler used on old window joints that has cracked, on period & listed homes, stone surrounds and tenement windows.
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 St Luke's.
The work is covered for a year after we finish. If there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Location
- St Luke's (N1, EC1V, EC2A)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Why act early in St Luke's
Cement-based fillers and modern sealants do not always suit a period surround. Sand mastic matches what was there and that can be important for listed homes. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in St Luke's, the repair is bigger than a sealant job.
We don’t show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we’ll talk you through it.
What you get with us
- 4.9 on Google from 180+ five-star reviews
- Homes, businesses and hotels
- 20+ years of sealant experience
- Tidy, careful work
Take a look at our cost guide or what customers say.
Places near St Luke's
What else we do in St Luke's
St Luke's questions
I let a flat near Old Street station. Can you help?
Yes, we work for letting agents and landlords. Just call 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear quote.
Do you cover St Luke's for sand mastic?
Yes. We work across London and the South East, and St Luke's is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job.
What does sand mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote.
Do I need to be at home?
We need access to the joints, so we will agree that with you when we book. Indoors, that generally means someone at home.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can I choose the sealant colour?
We will suggest a colour to suit the surroundings. The choice depends on the product the joint needs.
Can sand mastic be painted?
Traditional guidance is not to paint over sand mastic. If you’re redecorating the window, ask us first and we will advise.
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Do you need sand mastic in St Luke's?
Some old mastic was never deep enough. A thin layer does not hold well so we make sure the new mastic is the right thickness.
Keep an eye out for any of the following:
- Window mastic to renew ahead of painting
- Mastic worn away on windows facing the weather
- Mastic round period door frames that has failed
- Silicone on a period window that looks wrong
Schools such as St Luke's CofE Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Comparing quotes
- What guarantee comes with the work
- How the colour is chosen
- How hidden problems are handled
- Which sealant they’ll use, and why
What sealant work can’t fix
We’d rather tell you now than do work that will not last, so these are the limits:
- Sashes that need overhauling
- Cracked or broken glass
- Planning or listed building consent (your local planning authority decides)
If in doubt, ring 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Timber door frames
- Period & listed homes
- Sash and case windows
- Stone surrounds
- Brick reveals
- Tenement windows
What affects the quote in St Luke's
Every job gets its own quote. This is what makes a difference:
- When we can work, for business premises
- The amount of work
- How many rooms, windows or areas are involved
- Access and height
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Asking for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- If it’s domestic, commercial or a hotel
- How we’d reach the joints
- Any previous sealing or DIY work
- Pictures of the joints, sent by email
If you’re in St Luke's and need sand mastic, call 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
What happens on the day
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours for a single window, longer for several. In St Luke's, 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.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- Let us know about parking restrictions
- Keep children and pets away from the work area
Getting a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved and give you a clear quote.
Related advice
St Luke's homes and the weather
With historic houses such as Mansion House (about 0.8 miles south) nearby, there’s older building stock in the area around St Luke's 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.
St Luke's is in London, so parking needs planning: let us know about parking bays, permits or a driveway. If you live in an older home near Jewin Welsh Presbyterian Chapel, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
St Luke's is about 2 miles north of London, in Greater London. St Luke's gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. St Luke's is one of 764 towns and villages in Greater London where we work for sand mastic.
Work in N1, EC1V and EC2A works the same way as everywhere else we cover. If you need sand mastic at a property on Long Lane, City Road and Moor Lane or anywhere close by, our applicators can take on the job. Main roads around St Luke's include the A1 and A501, which makes travel easy. Other places close to St Luke's include Finsbury (1 mile south), Barbican Estate (1 mile south), Shoreditch (1 mile east), Hoxton (1 mile north-east) and City of London (1 mile south). Within a short drive, we also cover City of Westminster (3 miles west), Kensington (5 miles west), Walthamstow (5 miles north-east), Hampstead (4 miles north-west), Ruislip (14 miles west) and Brompton (4 miles south-west).
Landmarks near St Luke's
In St Luke's, that means homes and buildings near Barts Health Archives, Charterhouse Square School and The Masque Haunt pub, among other places. Nearby too are St Mary-at-Hill (1.1 miles south), Central Foundation Boys' School (less than half a mile east) and Artillery Ground (under half a mile south-east). There’s a railway station in St Luke's itself: Old Street station. Nearby you’ll also find Gabriel's Wharf (1.3 miles south-west) and Montfichet's Tower (0.9 miles south-west). Green spaces nearby include St. James's Park Lake and Barnsbury Wood.
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Keep sills and gutters clear so water drains away
- Go gently near the mastic when preparing windows
- Get any rot dealt with first
- Keep modern sealant off the mastic
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall, so renewing it early is worth it.