Greater London · England
Rowley Green Window Mastic
Window mastic in Rowley Green from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Cracked or shrunken mastic around the frame
- Gaps between the frame and the inside reveal
- A bead that does not match the frame
Window mastic for homes and businesses in Rowley Green
Whether it’s one leaking patio door or every frame on the house, you’ll get a clear quote before we start. To get one, call 0345 464 0079 or email us with the number of frames and any access details. We work on composite doors, timber windows & doors and window sills, and people most often call us about rain getting in at the frame or under the sill and cracked sealant at the sill ends.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease generally says who is responsible for the windows, so it’s worth checking before booking, and access in Rowley Green is something to talk through when you book.
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.
- Place
- Rowley Green (EN5)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
For landlords and businesses
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can go on one quote.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
What we do, step by step
Good joint work is mostly preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it normally takes a morning for a couple of windows and a door. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Rowley Green. It helps if you can point us to a visitor permit or a bay close to the door.
- First we look at every frame and agree the list.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Every joint is checked before we leave.
Getting ready for the visit
- Clear items away from the joints we are working on
- Let us know if you’ve seen damp or leaks
- Mention any sign-in or site rules at work premises
Getting a quote
We don’t publish a price list. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or drop us an email.
Related advice
Rowley Green: your questions answered
Do you cover Rowley Green for window mastic?
Yes, Rowley Green is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
I let a flat near Elstree & Borehamwood station. Can you help?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before we start.
Can I add another job to the visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Do you have insurance?
Yes. We are fully insured for domestic and commercial work.
Should I try DIY first?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
When is the sealant fully cured?
It depends on the product. We tell you how long to leave it before we go.
Do you guarantee window mastic?
Yes, for 12 months. Keeping drainage clear and checking the joints yearly helps them last.
What information do you need?
Just the basics: where it is, what you’ve noticed and how we reach it. After that, simply call 0345 464 0079 or drop us an email.
Towns and villages near Rowley Green
More services for Rowley Green
Frames and glazing around Rowley Green
In a converted house or block, who looks after the windows depends on the lease, so check that before booking. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
As a London address, Rowley Green can be tricky for parking: let us know about parking bays, permits or a driveway. If you look after a building such as Saffron Green Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Rowley Green is about 1 mile east of Borehamwood, in Greater London. Homes, rented property, offices and hotels in Rowley Green can book us for window mastic, old or new, large or small. The work is guaranteed for a year. Rowley Green is one of 764 places in Greater London where we work. Our London page covers work nearby (13 miles or so).
Our applicators cover all of the EN5 postcode area for window mastic. Neighbouring places we cover for window mastic include Arkley (1 mile south-east), Well End (1 mile north-west), Borehamwood (1 mile west), Deacon's Hill (2 miles south-west) and High Barnet (2 miles east). Within a short drive, we also cover London (13 miles south-east), City of Westminster (10 miles south), Marylebone (10 miles south-east), Kensington (11 miles south), St Pancras (10 miles south-east) and Shoreditch (11 miles south-east).
What’s near Rowley Green
Locally, jobs take us to homes and businesses close to Barnet Gate Wood and Elstree University Technical College and the streets around them. The closest station to Rowley Green is Elstree & Borehamwood station, roughly 1.4 miles west of the centre. Nearby you will also find Hilfield Castle (3.8 miles west) and Barnet General Hospital (1.4 miles east). Open spaces near Rowley Green include Darland's Lake and Rowley Lodge Field.
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Different surfaces, different methods
Composite doors
An exposed front door gets wind-driven rain, and the top and bottom corners tend to fail first. Those corners get the most care.
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.
Do you need window mastic in Rowley Green?
Joints that are too thin or too deep fail early. A skim of sealant over a wide gap soon tears, and a gap filled solid cannot flex. That’s what backing rod is for.
Signs it’s time to call us include:
- Whistling draughts around closed windows
- A bead that doesn’t match the frame
- Water coming in at the bottom corners of a door
- Untidy mastic left by window fitters
Homes close to Holy Cross include some older properties, and the joint between an old wall and a newer frame is usually the first place rain gets in.
What to look for in a quote
- Are they insured?
- What guarantee comes with the work
- What preparation is included
- Whether you can choose the colour
What affects the quote in Rowley Green
You’ll get a clear quote before any work starts. It’s based on:
- How many rooms, windows or areas are involved
- Any working-time requirements on site
- Access and height
- Whether old sealant or filler has to be cut out
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you are unsure, ring 0345 464 0079 or send us an email and we will give you an honest view and a quote.
Helping us quote
To help us quote quickly, let us know:
- Roughly how big the job is
- Whether it’s a home or a business
- Any access issues, like height or stairs
- If someone has resealed it before
We quote each job on its own, so the first step is telling us about yours. Just ring 0345 464 0079 or drop us an email with the details and send photos if you have them.
Why it’s worth doing now in Rowley Green
A quick bead over the top of old mastic looks like an easy fix, but new sealant can’t bond to old, crumbling mastic. It soon lifts and the leak carries on behind it. The old mastic has to come out. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Rowley Green, the repair is bigger than a sealant job.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why choose Mr Mastic in Rowley Green
- Colour agreed with you before any work starts
- We leave the area clean and tidy
- Rated 4.9 stars on Google
- More than 20 years in sealant work
See how sealant jobs are priced and our reviews.