Greater London · England
Window Mastic in New Charlton
Problem with your window and door frames in New Charlton? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Cracked or shrunken mastic around the frame
- Gaps between the frame and the inside reveal
- Leaking joints at the ends of sills
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too in New Charlton and across Greater London. We can quote a run of properties together, and we are fully insured.
We work for landlords and letting agents as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.
Window mastic in New Charlton
Homes in New Charlton have every kind of window: uPVC, aluminium, timber and composite, plus patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. We work on window sills, timber windows & doors and aluminium frames, and the jobs we see most are cracked internal joints between frame and plaster and untidy mastic left by window fitters.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, which is when draughts and damp patches appear in homes in New Charlton.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- New Charlton (SE7, SE18, E16)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Frames and glazing around New Charlton
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. 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.
For an older house near a landmark such as St Catherine Labouré, frames set in older brick or stone need a sealant that suits the wall as well as the frame. For site and facilities teams at buildings such as Royal Greenwich Trust School, larger buildings have plenty of frames, and the mastic around each one ages.
New Charlton is about 2 miles north-east of Greenwich, in Greater London. Across the SE7 area, our applicators can take on window mastic. Across Greater London, we cover 764 places, New Charlton among them. You can also see our page for London, roughly 6 miles from New Charlton.
Here we cover the SE7, SE18 and E16 postcode area for window mastic. We cover properties on Floyd Road, Priolo Road and Hasted Road. We also cover Charlton (1 mile south-east), Westcombe Park (1 mile south-west), Woolwich (1 mile east), Vanbrugh Park Estate (1 mile south-west) and Maze Hill (2 miles south-west). Larger places within reach include London (6 miles west), City of Westminster (8 miles west), Marylebone (8 miles west), Kensington (10 miles west), St Pancras (7 miles west) and Shoreditch (5 miles north-west).
Around New Charlton
Around New Charlton, our work takes us to homes and buildings near Thames Barrier Park, Thorntree Primary School and The Victoria pub, among other places. New Charlton has its own railway station: Charlton station. Nearby you will also find Charlton Athletic Museum (under half a mile south) and Greenwich Castle (1.9 miles south-west). Green spaces nearby include Gilbert's Pit.
The process
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, do the work and tidy away. Most jobs take a morning for a couple of windows and a door. In a London area like New Charlton, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
How to prepare
- Keep children and pets away from the work area
- Mention any sign-in or site rules at work premises
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work.
Read more
Towns and villages near New Charlton
What else we do in New Charlton
New Charlton: your questions answered
Can you do window mastic in New Charlton?
Yes, New Charlton is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and tell us what needs doing, and we will send you a clear quote.
Can parking be tricky for a visit in New Charlton?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
How long before the joint can be used?
That depends on the sealant used, so please follow the time we give you when we finish.
Is the new sealant paintable?
It depends on the sealant. Some hybrid sealants can be painted; silicone cannot. Tell us if you’re decorating and we will choose accordingly.
Can you do the inside joint as well?
Yes. Inside, the joint between frame and plaster is sealed neatly.
Will there be a smell?
It depends on the product. Some products have a noticeable smell, others very little.
Can new sealant go over the old?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Can resealing stop a draught around my window?
If the draught is coming in around the frame, yes. If it’s through the window’s own seals or a hinge, that’s a different fix, and we will say so.
When it isn’t the sealant
We will not take on work that will not last, so these are the limits:
- Faulty window hardware
- Rotten timber, which needs a joiner first
- Worn gaskets, brush seals or a door that has dropped
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly.
Where we work in New Charlton
- Patio & French doors
- Timber windows & doors
- Aluminium frames
- Window sills
- Composite doors
- uPVC windows
Aftercare tips
Good habits help new joints last longer. A few tips:
- Avoid blasting the frames with a pressure washer
- Keep solvents and bleach off the sealant
- Ventilate rooms so frames do not stay wet inside
- Keep paint and stain on wooden frames in good order
Most silicone sealants will not take paint, so mention any painting plans before any work starts. We can use a paintable sealant where that matters.
Wet, windy weather is when failed mastic shows itself, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Do you need window mastic in New Charlton?
Frames are never completely still. Sun on a frame makes it expand, and it contracts again overnight, while the masonry beside it stays put. A sealant that cannot keep up eventually tears.
Any of these means the joints need attention:
- Draughty joints inside around the window
- Old mastic that has gone black or come away
- Cracked or shrunken mastic around the frame
- Draughts coming in around windows and doors
As a London address, New Charlton can be tricky for parking: let us know about parking bays, permits or a driveway.
What to look for in a quote
- Whether you can choose the colour
- How the surfaces are prepared before sealing
- What guarantee comes with the work
- What insurance they hold
Why deal with it now?
Once mastic fails, rain can get between the frame and the wall. Over time that can mean damp patches, damaged plaster and rotting timber. A reseal is a much smaller job. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Combining jobs into one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
Why us?
- Full insurance on every job
- Colour picked to suit the job
- Over 20 years’ experience
- White, clear, grey or another colour, product permitting
Take a look at what affects the cost and what customers say.