Greater London · England
Window Mastic in Cranham
Window mastic for Cranham and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- White mastic on grey or black frames
- Hard, cracked sealant around windows
- Gaps between the frame and the inside reveal
How we quote for window mastic
For a quick quote, just ask. What matters most is:
- The product the joint needs
- The size of the job
- Any working-time requirements on site
- Mould in or behind the old joints
Doing several joints on one visit is usually more efficient than separate visits. We will give you a clear price for the lot.
What to tell us for a quote
To help us quote quickly, please include:
- If it’s domestic, commercial or a hotel
- What’s wrong with the joints now
- How we’d reach the joints
- Where the property is
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll explain what’s involved.
Window mastic in Cranham, done properly
Homes in Cranham have every kind of window: uPVC, aluminium, timber and composite, along with patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. Typical jobs include draughts coming in around windows and doors and sealant in the wrong colour for the frame, across patio & French doors, uPVC windows and composite doors.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, which is when draughts and damp patches appear in homes in Cranham.
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
- Cranham (RM14)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
For landlords and businesses
We work for landlords and agents as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Different surfaces, different methods
Window sills
Every drop off the glass ends up on the sill, so the sill ends and the joint under the frame are vital. They’re cut out and resealed with exterior sealant.
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
When to call us in Cranham
Every frame moves through the day. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the brick or render around it hardly moves. A sealant that cannot keep up eventually tears.
People usually contact us after spotting one of these:
- Rain getting in at the frame or under the sill
- Black, perished sealant on frames
- Gaps between the frame and the inside reveal
- Gaps where the sill meets the wall
For site and facilities teams at buildings such as Hall Mead School, the mastic around its windows and doors needs looking after like any other building’s.
Questions to ask before booking
- How the surfaces are prepared before sealing
- Whether VAT is included
- Whether all the old sealant comes out first
- What happens if the job turns out different
Honest limits
Sealant is not the answer to every problem, and we’ll tell you before work begins. It will not solve:
- Rotten timber, which needs a joiner first
- Worn gaskets, brush seals or a door that has dropped
- A sash or casement that will not close properly
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly.
Joints and surfaces we work on
- Composite doors
- Aluminium frames
- Window sills
- Timber windows & doors
- uPVC windows
- Patio & French doors
Your questions about window mastic in Cranham
I let a flat near Upminster station. Can you help?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear price.
Do you cover Cranham for window mastic?
Yes. We work across London and the South East, and Cranham is part of that. You can ring 0345 464 0079 or email us and tell us what needs doing.
Do you work for hotels and businesses?
Yes. We’ve worked for hotels, offices and other businesses.
Can you do upstairs windows?
Yes, in most cases. We plan safe access before the job.
Do you remove the old sealant?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Should I try DIY first?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
Can resealing stop a draught around my window?
Yes, where the draught is at the frame edge. We check where the draught is before we start.
Is there any odour?
It depends on the product. Some smell for a while, some hardly at all.
Also near Cranham
Other services in Cranham
How it works
You don’t need to clear the whole room or building, only the area right around the joints. Everything nearby is protected, and the job takes a few hours for a few frames, or a day or more for a whole house for a typical job. In a London area like Cranham, 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.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any previous sealing or DIY attempts
- Plan for the work area to be out of bounds to pets and children
Get a quote
Want a quote for window mastic? Please call 0345 464 0079 or send us an email with a few details. We’ll explain what we’d do and give you a clear price before work begins.
Related advice
Cranham homes and the weather
With historic houses such as Hare Hall (about 3 miles north-west) nearby, there’s older building stock in the area around Cranham as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking.
If you let a flat or house near Upminster station, renewing tired window mastic between tenants heads off draught and damp complaints. If you live in an older home near St Luke's Cranham, the joint between an old wall and a newer frame is generally the first place rain gets in.
Cranham is about 2 miles east of Hornchurch, in Greater London. We provide window mastic to homeowners, landlords and businesses in Cranham and nearby, as part of our work across Greater London. Across Greater London, we cover 764 places, Cranham among them. Chelmsford is on our list too, about 15 miles from Cranham.
We cover every part of the RM14 postcode area for window mastic and the streets around it. If you need window mastic at a property on Avon Road, Moor Lane and Front Lane or anywhere close by, we can help. Neighbouring places we cover for window mastic include Upminster (1 mile west), Puddle Dock (1 mile east), Upminster Bridge (1 mile west), North Ockendon (2 miles south-east) and Emerson Park (2 miles north-west). Larger places within reach include Shoreditch (15 miles west), Walthamstow (13 miles west), Hoxton (15 miles west), Whitechapel (15 miles west), Orpington (14 miles south-west) and Plaistow (11 miles west).
Landmarks near Cranham
We work in homes and buildings around The James Oglethorpe Primary School, The Crumpled Horn pub and St. Andrew's Park. For rail, the closest station is Upminster station, about 0.7 miles west of the centre. Other landmarks nearby include The Mercury Mall (3.7 miles west) and Upminster Tithe Barn Museum of Nostalgia (0.6 miles north-west). For a walk, there’s Cranham Brickfields.
Why act early in Cranham
A cracked joint around a frame lets rain into the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. A reseal is a much smaller job. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Cranham, the repair is bigger than a sealant job.
The cost reflects the work involved, not a rough estimate. That’s why we ask about the job first and agree the price before starting.
Why us?
- Rated 4.9 stars on Google
- A choice of colours where the product allows
- Sanitary silicone with an anti-fungal additive in wet areas
- More than 20 years in sealant work
Take a look at how sealant jobs are priced and what customers say.