Greater London · England
Window Mastic in St George's Fields
Window mastic for St George's Fields, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Black, perished sealant on frames
- Gaps between the frame and the inside reveal
- Rain getting in at the frame or under the sill
St George's Fields: your questions answered
Can you do window mastic in St George's Fields?
Yes. We work across London and the South East, and St George's Fields is part of that. You can ring 0345 464 0079 or drop us an email and tell us what needs doing, and we will give you a clear quote.
Is parking an issue for window mastic in St George's Fields?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Is the work guaranteed?
Yes, with our 12-month guarantee. A yearly look at the joints helps them last.
Will resealing my frames help with draughts?
If the draught is coming in around the frame, yes. If it’s through the window’s own seals or a hinge, that is a different fix, and we will say so.
Do you seal inside as well as outside?
Yes. The outside joint keeps the weather out, and the inside joint stops draughts and finishes the reveal. We do one or both.
Is it worth trying it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Can you do several jobs on one visit?
Yes, and it often makes sense. Doing several areas at once is usually more efficient.
How long before the joint can be used?
Cure times vary by product and the temperature. We tell you how long to leave it before we go.
About our window mastic in St George's Fields
A cold draught around a closed window often comes from the frame edge. A new joint stops the air getting through. If the draught is through the window seals instead, we will tell you. If you have mastic that has split away from the wall and old mastic that has gone black or come away, we can help, on window sills, patio & French doors and uPVC windows alike.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Where
- St George's Fields (SE1, SE11, SE17)
- Region
- Greater London
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Places near St George's Fields
What else we do in St George's Fields
Why it’s worth doing now in St George's Fields
Failed mastic is not a reason to replace sound windows. Where the frames are sound, new mastic normally deals with draughts and leaks at the edges. If we find failed glass units or worn seals, we will tell you. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we will go through it with you.
Why choose Mr Mastic in St George's Fields
- 180+ five-star Google reviews
- Anti-fungal silicone where joints get wet
- Fully insured
- We never seal over old sealant
Take a look at what affects the cost and our reviews.
Landlords, agents and businesses in St George's Fields
For anyone letting property in or around St George's Fields, several properties can be quoted together. Send us the addresses and the work at each.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Windows and doors in St George's Fields
Historic houses like Benjamin Franklin House (about 1.1 miles north-west) are a reminder that the area around St George's Fields has older buildings as well as new. Where a home is older, 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.
St George's Fields is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Managing a site like St George's Cathedral Catholic Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
St George's Fields is about 1 mile west of London, in Greater London. For window mastic in and around St George's Fields, it’s easy to get a quote: please ring 0345 464 0079 or drop us an email. We are based in Crawley and cover Greater London. St George's Fields is one of 764 towns and villages in Greater London where we work.
Work in SE1, SE11 and SE17 is quoted and booked the same way as anywhere else. If you need window mastic at a property on York Road, Spur Road and Bear Lane or a nearby road, we can help. St George's Fields sits on or near the A300 and A302. We also cover Elephant and Castle (1 mile south-east), Newington Butts (1 mile south-east), Vauxhall (1 mile south-west), Lambeth (1 mile south-west) and Westminster (1 mile west). We also work in nearby towns such as Kensington (4 miles west), Walthamstow (7 miles north-east), Hoxton (3 miles north), Hampstead (5 miles north-west), Ruislip (14 miles west) and Brompton (3 miles west).
Around St George's Fields
Around St George's Fields, our work takes us to homes and buildings near The Duke Of Clarence Public House, London School of Musical Theatre and Lambeth Palace Library, among other places. You will also find Notre Dame Roman Catholic Girls' School (less than half a mile south-west) and Geraldine Mary Harmsworth Park (within half a mile south-west). There’s a railway station in St George's Fields itself: Elephant & Castle station. Nearby you’ll also find Baynard's Castle (0.9 miles north) and General Lying-In Hospital (0.5 miles west). For a walk, there’s Bellenden Road Nature Garden and St. James's Park Lake.
Quotes for window mastic in St George's Fields
You will get a clear quote before any work starts. It takes into account:
- The size of the job
- Working hours on commercial sites
- How many areas need sealing
- Mould in or behind the old joints
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Asking for a quote
There’s no need for technical detail. Just tell us:
- Whether it has been sealed before
- A few pictures by email, if you can
- Roughly how big the job is
- Any access issues, like height or stairs
To get a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. We’ll give you a clear price before any work starts.
How it works
When we get to you, 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 morning for a couple of windows and a door. In St George's Fields, 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 start by checking each window and door with you.
- The old mastic is cut out and the surfaces cleaned back.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Every joint is checked before we leave.
How to prepare
- Let us know about parking restrictions
- Mention if the joints have been sealed before
- Try not to wet indoor joints just before the visit
Ask for a quote
Asking for a quote is easy: let us know the job and the location and its rough size. Photos by email help us understand the job.
Related advice
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
How to look after the new joints
A little care helps the new joints last. We recommend:
- Keep paint off silicone joints
- Make sure the drainage slots are not blocked
- Keep paint and stain on wooden frames in good order
- Ventilate rooms so frames do not stay wet inside
Keep sill grooves and drainage slots clear, so rain drains out rather than building up at the sealant.
Signs to watch for: split or missing mastic, gaps, damp patches inside or black mould on the reveal. Any of these is worth a call.
What we are called out for in St George's Fields
Joints that are too thin or too deep fail early. A thin smear across a wide gap has nothing to it, and a gap filled solid cannot flex. Backing rod sets the right depth.
Most people get in touch after spotting something like this:
- Gaps where the sill meets the wall
- Rain getting in at the frame or under the sill
- Gaps between the frame and the inside reveal
- Sealant in the wrong colour for the frame
For landlords with property near Elephant & Castle station, renewing tired window mastic between tenants heads off draught and damp complaints.
What your quote should include
- Is VAT in the price?
- Whether they seal over old material or remove it
- What preparation is included
- Whether you can choose the colour