Greater London · England
Peaks Hill Window Mastic
Window mastic in Peaks Hill from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Untidy mastic left by window fitters
- Draughts coming in around windows and doors
- Mastic that has split away from the wall
How we handle window mastic in Peaks Hill
Most frames have an outside joint and an inside one. Outside, the mastic keeps rain out; inside, the joint between frame and plaster stops draughts and tidies the reveal. We seal one or both, depending on what’s needed. We work on window sills, uPVC windows and timber windows & doors, and the jobs we see most are whistling draughts around closed windows and mastic that’s falling out in pieces.
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.
The work is covered for a year after we finish. If anything isn’t right with it, phone 0345 464 0079 or email us.
- Place
- Peaks Hill (CR8, SM6)
- Region
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
DIY sealant or a professional job?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
How we quote for window mastic
The quote reflects the job in front of us. We look at:
- The product the joint needs
- How many rooms, windows or areas are involved
- Any mould that needs treating
- Working hours on commercial sites
The cost reflects the work involved, not a rough estimate. That is why we ask a few questions first.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- Where the job is, and your postcode
- The rough size of the job
- Access, such as stairs, a lift or height
- What the problem is, such as mould, gaps, leaks or cracking
We don’t publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or drop us an email.
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
We work for landlords and letting agents as well as homeowners. Resealing between tenancies keeps a property looking cared for.
Leave it or put it right?
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’ll tell you. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble for homes in Peaks Hill.
The cost depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before work begins.
Why Peaks Hill customers choose us
- 4.9 on Google from 180+ five-star reviews
- Tidy, careful work
- Fully insured
- An ARBOMaster approved applicator
Take a look at our cost guide or customer reviews.
How it works
Once we are on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take a few hours for a few frames, or a day or more for a whole house. In Peaks Hill, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away, along with any loose debris.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- On commercial sites, let us know about site rules
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
Want a quote for window mastic? Please ring 0345 464 0079 or email us and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Advice
How the job changes by surface
Timber windows & doors
Timber moves with moisture as well as heat, so the joint must stay flexible. The paint or stain needs to be sound where the sealant meets it.
Patio & French doors
Patio and French doors have the longest joints on most houses. The threshold and the bottom corners take the most water, so we pay close attention there.
Frames and glazing around Peaks Hill
In a converted house or block, who looks after the windows depends on the lease, so check that before you book. Historic houses like Addington Palace (about 4 miles east) are a reminder that the area around Peaks Hill 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’s traditional sand mastic.
For site and facilities teams at buildings such as Coloma Convent Girls' School, its window and door frames need their mastic kept sound, just like a home’s. Peaks Hill is in London, so parking needs planning: let us know about parking bays, permits or a driveway. Rented homes near Purley station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Peaks Hill is about 1 mile north-west of Purley, in Greater London. Homes, rented property, offices and hotels in Peaks Hill is covered for window mastic. The work is guaranteed for a year. Our Greater London coverage runs to 764 places, Peaks Hill among them. You can also see our page for London, about 11 miles away.
Our applicators cover all of CR8 and SM6 for window mastic. Whether your property is on Furze Lane, Birch Lane and Plough Lane or a nearby road, our applicators can take on the job. With the A2022 close by, Peaks Hill is simple for us to get to for window mastic. Nearby, we also carry out window mastic in Russell Hill (1 mile north), Roundshaw (1 mile north), Woodcote (1 mile south-west), Purley (1 mile south-east) and Woodcote Green (1 mile west). Within a short drive, we also cover London (11 miles north), City of Westminster (12 miles north), Marylebone (12 miles north), Kensington (11 miles north), St Pancras (13 miles north) and Shoreditch (13 miles north).
What’s near Peaks Hill
Locally, jobs take us to homes and businesses close to Carshalton Park, Margaret Roper Catholic Primary School and The Foxley Hatch pub, among other places. For rail, the closest station is Purley station, roughly 0.8 miles south-east. A little further out are St George's Walk (2.4 miles north-east) and Croydon Airport Visitor Centre (1 mile north-east). Open spaces near Peaks Hill include Duppas Hill and Roundshaw Downs.
Questions from Peaks Hill
Is parking a problem for a job in Peaks Hill?
Parking in Peaks Hill, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Can you do window mastic in Peaks Hill?
Yes. We work across London and the South East, and Peaks Hill is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job.
Can new sealant go over the old?
No, because it fails. The old sealant always comes out first, so the new sealant bonds properly.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
Is it messy?
We keep the work tidy. Nearby surfaces are protected.
Do you have insurance?
Yes, we are fully insured for domestic and commercial work.
Can landlords and businesses book you?
Yes. We work for householders, landlords, letting agents, businesses and hotels.
How long should I leave it?
That depends on the sealant used, so follow the cure time we give you when we finish.
Aftercare tips
After the cure time, these simple habits help:
- Wash the frames with mild soapy water
- Check the mastic once a year
- Don’t paint over the silicone
- Ventilate rooms so frames don’t stay wet inside
On timber frames, keep the paintwork in good order, since wood that gets wet swells and shrinks more. Paint up to the joint, not over the silicone.
A failed joint lets water into the wall a little at a time. You might not see it until plaster blows or a damp patch appears inside. Catching it early keeps the fix to a reseal.