Greater London · England
Window & door mastic in North Greenwich, Greater London
Our applicators work in North Greenwich on mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly.
- Gaps between the frame and the inside reveal
- Black, perished sealant on frames
- Mastic that has split away from the wall
About our window mastic in North Greenwich
Whether it’s one leaking patio door or every frame on the house, the work is priced before anything is done. Just ring 0345 464 0079 or email us and tell us how many frames there are and how they’re reached for window mastic in North Greenwich. Typical jobs include gaps between the frame and the inside reveal and rushed sealant from a window installation, on timber windows & doors, uPVC windows and aluminium frames.
Many London homes are flats, with windows high above the street. Who looks after the outside of the frames can depend on the lease, so check that first, and access in North Greenwich is something to talk through when you book.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Where
- North Greenwich (E14, SE8, SE10)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Why deal with it now?
Draughts and leaks don’t always mean new windows. Where the frames are sound, new mastic generally deals with draughts and leaks at the edges. Problems with the glass or gaskets are for a window company, and we’ll say so. 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.
Doing several joints on one visit normally makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Why choose Mr Mastic in North Greenwich
- Quality sealants from Arbo and Everbuild
- ARBOMaster approved applicator
- 20+ years of sealant experience
- Experience in homes, commercial sites and hotels
Read our cost guide or what customers say.
What we are called out for in North Greenwich
Older frames were often sealed with products that set hard. Once it’s rigid, every bit of frame movement pulls at it, and a gap opens along one edge.
Keep an eye out for any of the following:
- Damp patches on the reveal after heavy rain
- Cracked internal joints between frame and plaster
- Gaps left after new windows were fitted
- Old mastic that has gone black or come away
In the older streets around Church of St Nicholas, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Questions to ask before you book
- How the joint is cleaned and prepared
- What the quote includes, VAT included or not
- When the joint can take water or movement
- Which sealant they’ll use, and why
What happens on the day
We keep the work tidy and contained to the area we are working on, so you can get on with your day. The job usually takes a morning for a couple of windows and a door, and we tell you how long to leave it before we go. In a London area like North Greenwich, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Let us know about stairs, lifts or work at height
- Clear items away from the joints we are working on
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email photos if that is easy.
Advice
Honest limits
It helps to know what we can’t do too:
- Penetrating damp from a failed cavity tray or render
- Faulty window hardware
- A frame that has rotted at the joint
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
Where we work in North Greenwich
- Composite doors
- Aluminium frames
- Window sills
- Timber windows & doors
- Patio & French doors
- uPVC windows
Places near North Greenwich
Also in North Greenwich
Aftercare tips
A little care helps the new joints last. We recommend:
- Keep jet washers away from the mastic
- Air rooms to keep condensation down around windows
- Keep paint and stain on wooden frames in good order
- Check the mastic once a year
Keep sill grooves and drainage slots clear, so water can run away instead of sitting against the joint.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. Resealing closes it.
Can I do it myself?
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 fails, we can still redo it.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly.
What window mastic looks like in North Greenwich
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
For site and facilities teams at buildings such as Harbinger Primary School, larger buildings have plenty of frames, and the mastic around each one ages. For landlords with property near Greenwich station, renewing tired window mastic between tenants heads off draught and damp complaints.
North Greenwich is about 1 mile north-west of Greenwich, in Greater London. North Greenwich gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 764 places across Greater London, from the larger towns to small villages.
Every address in E14, SE8 and SE10 is covered for window mastic, from the main roads to the quietest streets. That includes homes and businesses on Creek Road, Wynan Road and Undine Road and the roads around them. If you’re just outside North Greenwich, we cover Isle of Dogs (1 mile south-east), Millwall (1 mile west), Cubitt Town (1 mile north-east), Deptford (1 mile south-west) and Greenwich (1 mile south-east). We also work in nearby towns such as London (3 miles west), City of Westminster (6 miles west), Marylebone (6 miles west), Kensington (8 miles west), St Pancras (5 miles north-west) and Shoreditch (4 miles north-west).
Landmarks near North Greenwich
In North Greenwich, that means homes and buildings near Laban Centre, Canary Wharf College 3 and St. Paul's, among other places. Other local landmarks include Mudchute Park and Farm (under half a mile north-east) and The Ferry House Public House (less than half a mile south-east). North Greenwich’s nearest station is Greenwich station, about 0.8 miles south. Other landmarks nearby include Old Royal Naval College (0.7 miles south-east) and Greenwich Castle (1.1 miles south-east). Open spaces near North Greenwich include Sue Godfrey Nature Park and Tower Hill.
How we quote for window mastic
We quote each job individually. These are the things that affect it:
- How many areas need sealing
- The size of the job
- Whether there’s mould to deal with
- Access and height
What you pay reflects the work, not guesswork. That’s why we ask about the job first and give you a clear price before we start.
What to tell us for a quote
There’s no need for technical detail. Just tell us:
- The rough size of the job
- The address or postcode of the job
- Photos by email, if that’s easy
- Any previous sealing or DIY work
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. Whenever you’re ready, phone 0345 464 0079 or email us.
Questions from North Greenwich
Do you cover North Greenwich for window mastic?
Yes. Our work covers London and the South East, and North Greenwich is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we will give you a clear price.
I let a flat near Greenwich station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear quote.
Are you insured?
Yes, we’re fully insured.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Will resealing my frames help with draughts?
Yes, if the air is getting in around the frame. If it’s through the window’s own seals or a hinge, that’s a different fix, and we will say so.
How much does window mastic cost in North Greenwich?
Size, access and the old material all affect the cost. Call for a quick quote and we will talk you through it.
Does someone need to be in?
We need access to the joints, so we will agree that with you when we book. Indoors, that usually means someone at home.
Do you work for hotels and businesses?
Yes. Larger jobs can be planned room by room or area by area to suit the site.