Greater London · England
Window & door mastic in Waterloo, Greater London
We cover Waterloo for mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Damp patches on the reveal after heavy rain
- Rushed sealant from a window installation
- Black, perished sealant on frames
Leave it or put it right?
Working on frames from a ladder with a sealant gun is not easy, especially on upper floors. A professional job is cut out properly, backed where needed and finished neatly, using a product chosen for the frame and wall. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Waterloo, the repair is bigger than the sealant job would have been.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Ask us for a quote and we’ll explain what it covers.
Why Waterloo customers choose us
- Colour agreed with you before we start
- A 12-month guarantee on all work
- Homes, businesses and hotels
- More than 20 years in sealant work
Read what affects the cost and what customers say.
Window mastic in Waterloo
Whether it’s one leaking patio door or every frame on the house, the work is priced before anything is done. To get one, ring 0345 464 0079 or email us with the number of frames and any access details. We work on uPVC windows, window sills and aluminium frames, and common reasons people get in touch are gaps where the sill meets the wall and draughty joints inside around the window.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease generally says who is responsible for the windows, so it’s worth checking before booking, and access in Waterloo is something to talk through when you book.
We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.
- Place
- Waterloo (SE1, SE11, WC2N)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Also near Waterloo
Also in Waterloo
How it works
There’s no need to move everything out, only the area right around the joints. We protect the rest, and the job takes anything from an hour or two to a full day, depending on how many frames there are for a typical job. In Waterloo, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We check each frame and agree which ones need doing.
- The old mastic is cut out and the surfaces cleaned back.
- We fit backing rod in deep gaps so the sealant is the right depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Finally we tidy up and check each joint.
Preparing for the visit
- Mention any sign-in or site rules at work premises
- Mention any leaks or damp you’ve noticed
- Let us know about earlier repairs to the joints
Get a quote
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we will talk you through the work and give you a clear price.
Read more
Common questions in Waterloo
Is parking a problem for a job in Waterloo?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Do you cover Waterloo for window mastic?
Yes. Our work covers London and the South East, and Waterloo is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job.
Are you insured?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
Is there any odour?
Possibly a little. It fades as the sealant cures.
Where are you based?
We work from Crawley. Our applicators cover Waterloo.
Is the work guaranteed?
Yes. Our one-year guarantee covers every job, inside or out.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We explain the product when we quote.
What does window mastic cost?
Size, access and the old material all affect the cost. Call for a quick quote and we will talk you through it.
Can I do it myself?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Window mastic in Waterloo: local notes
Historic houses like Benjamin Franklin House (about 0.7 miles north-west) are a reminder that the area around Waterloo 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. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near Christ Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For site and facilities teams at buildings such as Oasis Academy Johanna, its window and door frames need their mastic kept sound, just like a home’s. For landlords with property near London Waterloo station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Waterloo is about 1 mile west of London, in Greater London. Every kind of property in Waterloo is covered for window mastic. The work is guaranteed for a year. 764 places in Greater London are on our list, from the larger towns to small villages.
Our applicators cover all of SE1, SE11 and WC2N for window mastic. Whether your property is on York Road, Spur Road and Bear Lane or a nearby road, our applicators can take on the job. Waterloo is on the A301 and A302, which makes it straightforward to reach. We also cover the places around Waterloo: South Bank (1 mile north-west), Bankside (1 mile north-east), Adelphi (1 mile north-west), Temple (1 mile north) and Charing Cross (1 mile north-west). Within a short drive, we also cover Kensington (4 miles west), Walthamstow (7 miles north-east), Hoxton (3 miles north-east), Hampstead (5 miles north-west), Ruislip (14 miles west) and Orpington (12 miles south-east).
What’s near Waterloo
In Waterloo, that means homes and buildings near Jubilee Gardens, Oasis Academy South Bank and Lambeth Palace Library. You’ll also find The Duke of Sussex pub (under half a mile east) and Oasis Academy South Bank (under half a mile south). Waterloo has its own railway station: London Waterloo station. A little further out are Gabriel's Wharf (0.5 miles north) and Baynard's Castle (0.9 miles north-east). For a walk, there’s Ludgate Hill and Bellenden Road Nature Garden.
For landlords and businesses
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will give you a quote.
Housing providers, facilities teams and property managers book us too in Waterloo and across Greater London. We can quote a run of properties together.
How the job changes by surface
uPVC windows
We clean the frame edge carefully so the plastic is not marked, then the sealant goes in between frame and wall.
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the threshold joint takes a lot of water. Each is cleaned, backed where deep and resealed.
Honest limits
New sealant can’t fix everything, and we will tell you before any work starts. It won’t solve:
- Worn gaskets, brush seals or a door that has dropped
- Rotten timber, which needs a joiner first
- A failed sealed unit that has misted up
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think before booking.
Joints and surfaces we work on
- Window sills
- Aluminium frames
- Composite doors
- uPVC windows
- Patio & French doors
- Timber windows & doors
What affects the cost of window mastic
There’s no set price list, because jobs vary so much. What we look at:
- The amount of work
- Working hours on commercial sites
- Whether old sealant or filler has to be cut out
- Whether there’s mould to deal with
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Helping us quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Where the job is, and your postcode
- A few photos by email, if you can
- Whether it has been sealed before
- What’s wrong with the joints now
If you are in Waterloo and need window mastic, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before any work starts.