Greater London · England
Window Mastic in Cranford
Mastic around window and door frames, sills and patio doors for Cranford, backed by a 12-month guarantee. Call for a quick quote.
- Cracked internal joints between frame and plaster
- Water coming in at the bottom corners of a door
- Cracked or shrunken mastic around the frame
Window mastic in Cranford, done properly
Over two decades of sealing frames has taught us which products suit which walls. We’re ARBOMaster approved and fully insured, and we give a 12-month guarantee on the work. We work on composite doors, aluminium frames and window sills, and people most often call us about mastic that’s falling out in pieces and untidy mastic left by window fitters.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out.
You’re covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Location
- Cranford (TW4, TW5, UB3)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What happens if it’s left?
A quick bead over the top of old mastic looks like an easy fix, but new sealant cannot bond to old, crumbling mastic. It peels before long, and water still gets in behind. Proper resealing starts with removing the old joint. 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 Cranford, the repair is bigger than the sealant job would have been.
Doing several joints on one visit is usually more efficient than separate visits. We will give you a clear price for the lot.
Why choose Mr Mastic in Cranford
- Approved under the ARBOMaster scheme
- Sanitary silicone with an anti-fungal additive in wet areas
- Colour picked to suit the job
- Fully insured
Take a look at our cost guide or customer reviews.
Frames and glazing around Cranford
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you live in an older home near The Parish Church of the Good Shepherd, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Cranford is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Cranford is about 2 miles north of Feltham, in Greater London. Across the TW4 area, we can carry out window mastic at your property. Cranford is one of 764 places in Greater London we cover for window mastic. For nearby work, see our London page (14 miles or so).
We cover every part of the TW4, TW5 and UB3 postcode area for window mastic and the streets around it. Streets in the area include Ely Road, Park Lane and The Avenue, and we cover them all. If you’re just outside Cranford, we cover Hatton (1 mile south-west), Harlington (1 mile north-west), Heathrow (2 miles west), Feltham (2 miles south) and Sipson (2 miles north-west). Larger places within reach include London (14 miles east), City of Westminster (11 miles east), Marylebone (12 miles east), Kensington (9 miles east), St Pancras (13 miles east) and Shoreditch (15 miles east).
What’s near Cranford
Typical jobs here are in homes near Cranford Community College, The Queen's Head pub and Hounslow Heath, among other places. For rail, the closest station is Hayes & Harlington station, about 1.9 miles north. Other landmarks nearby include Hounslow Hospital (1.6 miles east) and Treaty Centre (2 miles east). The countryside around Cranford includes Garden Lake and Northala Fields.
When something else is needed
It helps to know what we cannot do:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- A sash or casement that won’t close properly
- A frame that has rotted at the joint
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly.
Where we work in Cranford
- uPVC windows
- Patio & French doors
- Composite doors
- Aluminium frames
- Window sills
- Timber windows & doors
Should I try it myself first?
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 doesn’t work out, we can still put it right.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Other services in Cranford
FAQs for Cranford
Is Cranford in your area for window mastic?
Yes. We work across London and the South East, and Cranford is part of that. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
Is parking a problem for a job in Cranford?
Parking in Cranford, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Can tenants book the work?
Yes, though it’s best to check with your landlord first. Landlords are often happy for the work to be arranged.
Can resealing stop a draught around my window?
It will if the frame joint is the problem. We find where the air is coming from before we reseal.
Do the sealants smell?
Some sealants have a smell while they cure, which fades as it sets. Ventilation helps.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Is it messy?
We keep the work tidy. We protect what’s around the joints, and the area is left clean when we finish.
How long should I leave it?
That depends on the sealant used, so please follow the time we give you.
Do you need window mastic in Cranford?
Joint shape matters as much as the product. A skim of sealant over a wide gap soon tears, while a joint packed solid cannot stretch. That’s what backing rod is for.
It’s worth asking for a quote if you see:
- Cracked sealant at the sill ends
- Rain getting in at the frame or under the sill
- Black, perished sealant on frames
- White mastic on grey or black frames
If you look after a building such as Cranford Primary School, the mastic around its windows and doors needs looking after like any other building’s.
What your quote should include
- The length of the guarantee
- Whether they seal over old material or remove it
- What the cure time is
- How the joint is cleaned and prepared
How we quote for window mastic
Every job gets its own quote. These are the things that affect it:
- The amount of work
- Access and height
- Working hours on commercial sites
- How many areas need sealing
A failed joint rarely gets cheaper to fix by waiting. If you are not sure whether it needs doing, call 0345 464 0079 or email us for an honest opinion and a quote.
Helping us quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Where the property is
- Any previous sealing or DIY work
- A few pictures by email, if you can
- How many joints, rooms or windows are involved
To get a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We will give you a clear price before any work starts.
Different surfaces, different methods
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We’ll tell you if that is what we find.
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We can talk through the options.
What we do, step by step
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a morning for a couple of windows and a door, and the area is left clean. For a job in Cranford, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- Tell us about any previous sealing or DIY attempts
- Where the joints are inside, avoid wetting them before we arrive
- Mention any tricky access
Getting 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 explain what’s involved and give you a clear quote.