South East England and London
Window Mastic in City of London
From the largest town to the smallest village in City of London, we can help with window mastic. Clear quotes up front, and a one-year guarantee.
Towns we cover in City of London
Mastic around window and door frames, sills and patio doors. Choose your town from the list to see local details, and get in touch for a quick quote.
Largest places
What else we do in City of London
- New-build mastic & snagging
- Gutter, fascia & soffit sealing
- Commercial & hotel sealant
- Floor & skirting joints
- Sand mastic for sash & case windows
- Glazing & conservatory sealant
- Fire-rated sealant
- Regrouting
- Remedial sealant & repairs
- Bathroom & kitchen resealing
- External & façade joints
Postcode areas we cover
About window mastic in City of London
A window frame and the wall around it expand and shrink at different rates. Heat and cold make frames grow and shrink against brick or render that hardly moves. So the sealant has to stretch and recover, which is why we use a low-modulus product. We work on patio & French doors, timber windows & doors and uPVC windows, and people most often call us about leaking joints at the ends of sills and gaps between the frame and the inside reveal.
Once we’re 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 for a handful of frames, longer for a whole house.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away.
- Frame and wall are cleaned and must be dry before sealing.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Pricing in City of London
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are not sure whether it needs doing, call 0345 464 0079 or send us an email and we will give you an honest view and a quote.
Why book with us
- White, clear, grey or another colour, product permitting
- Tidy, careful work
- Every job guaranteed for a year
- 20+ years of sealant experience
Getting a quote
We don’t publish a price list. Instead, we give you a clear quote for your job. To get started, call 0345 464 0079 or send us an email.
Local landmarks in City of London
Locally, jobs take us to homes and businesses close to Fashion Retail Academy, Prior Weston Primary School and Children's Centre and Barts Health Archives, among other places. Also close by are Golden Fleece pub (under half a mile south), St Alphage Garden (less than half a mile north), Central Foundation Boys' School (0.8 miles north) and St Mary-at-Hill (0.5 miles south-east). There’s a railway station in City of London itself: London Cannon Street station. Other landmarks nearby include Gabriel's Wharf (0.8 miles south-west) and London Mithraeum (less than half a mile south). Green spaces nearby include St. James's Park Lake and Barnsbury Wood.
- Local churches include St Olave Old Jewry (under half a mile east)
Windows and doors across City of London
City of London has everything from older homes with timber frames to newer ones with uPVC. Exposed walls are where window sealant normally fails first, wherever they are in City of London.
London and the South East have homes from every era, from period terraces to post-war new towns and new estates. Each needs the right sealant for its age and materials.
City of London: As a London address, City of London can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Managing a site like Fashion Retail Academy? Then its window and door frames need their mastic kept sound, just like a home’s.
Can I do it myself?
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.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
How the job changes by surface
Composite doors
A composite door generally sits in a plastic outer frame, so its perimeter joint is sealed much like a window. We match the colour to the frame.
uPVC windows
Some uPVC windows were sealed at fitting with a quick bead that never bonded. We cut it out, back any deep gaps and reseal properly.
Why act early?
A cracked joint around a frame lets rain into the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. Resealing now is a small job by comparison.
Comparing quotes
- The length of the guarantee
- What happens if they find a problem under the old sealant
- How the joint is cleaned and prepared
- Whether the sealant suits the joint
What sealant work cannot fix
A few problems are outside what sealant work can do:
- Worn gaskets, brush seals or a door that has dropped
- Soft or decayed wood in the frame
- Misting between the panes of a double-glazed unit (that needs a new unit)
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Check the mastic once a year
- Air rooms to keep condensation down around windows
- Do not paint over the silicone
- Repaint timber before it’s bare
Check the drainage slots in the frames aren’t blocked, so rain drains out rather than building up at the sealant.
Water trapped behind a failed joint can start rot in timber frames and sills. Rotten timber needs a joiner, not a sealant, so it pays to reseal before that happens.
City of London: your questions answered
How much does window mastic cost in City of London?
Every job is different, so each one gets its own quote. To get one, phone 0345 464 0079 or email us and let us know what needs doing and where.
I rent my home. Can I book you?
Yes, but check with your landlord or agent first. Landlords are often happy for the work to be arranged.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Do you work in City of London?
We do. City of London is part of the area we cover, and the service is the same as everywhere else.
What sealant do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
How long should I leave it?
It depends on the product. We tell you how long to leave it before we go.
Is there any odour?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.