Hertfordshire · England
Window & door mastic in Green Street, Hertfordshire
Professional window mastic in and around Green Street, with every bit of old sealant taken out first and a 12-month guarantee.
- Cracked sealant at the sill ends
- Old mastic that has gone black or come away
- Whistling draughts around closed windows
FAQs for Green Street
Can you do window mastic in Green Street?
Yes, Green Street is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or email us with a few details of the job, and we’ll send you a clear quote.
I let a flat near Elstree & Borehamwood station. Can you help?
Yes, rental work is part of what we do. You can call 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Can you quote for more than one area?
Yes. Just list everything you need and you will get one quote.
Is the work guaranteed?
Yes, for 12 months. Keeping drainage clear and checking the joints yearly helps them last.
Do you take out the old sealant first?
Yes, every time. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We’ll tell you how long to leave the joint before we leave.
Is it messy?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Do I have to be there?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you don’t need to watch us work.
Window mastic for homes and businesses in Green Street
A window frame and the wall around it expand and shrink at different rates. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. That is why the joint needs a flexible, low-modulus sealant rather than something rigid. If you have hard, cracked sealant around windows and cracked sealant at the sill ends, we can put it right, on patio & French doors, aluminium frames and uPVC windows alike.
Homes in small places like Green Street often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
We stand behind the work with a 12-month guarantee, so you are not left on your own once the job is done.
- Place
- Green Street (WD6)
- Wider area
- Hertfordshire
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
How long the joints last depends on use and care. We suggest:
- Paint up to the joint, not over it
- Don’t aim a pressure washer at the joints
- Do not use solvent cleaners on the joint
- Clear any debris from frame drain holes
Have a look at the joints once a year, ideally after winter. Cracks and lifting edges are easy to spot early.
Look out for the warning signs: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. Any of these is worth a call.
Window mastic in Green Street: local notes
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Wyllyotts Manor (about 3.7 miles north-east) are a reminder that the area around Green Street has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Schools such as Parkside Community Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. Rented homes near Elstree & Borehamwood station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Green Street is about 1 mile north of Borehamwood, in Hertfordshire. We provide window mastic to householders, landlords and businesses in Green Street and the surrounding area. We cover 381 towns and villages across Hertfordshire. There’s also a page for London, roughly 14 miles from Green Street.
Our applicators cover all of WD6 for window mastic. Local streets include Stapleton Road, Green Street and Cowley Hill, all of which we cover. Other places close to Green Street include Well End (1 mile south-east), Borehamwood (1 mile south), Shenley (1 mile north-west), Ridge (2 miles north-east) and Rowley Green (2 miles south-east). We also work in nearby towns such as Watford (5 miles west), Hemel Hempstead (10 miles north-west), St Albans (6 miles north-west), Welwyn Garden City (9 miles north), Harpenden (10 miles north) and Hoddesdon (12 miles north-east).
Landmarks near Green Street
Locally, jobs take us to homes and businesses close to The White Horse Public House and Hertswood Academy, among other places. The closest station to Green Street is Elstree & Borehamwood station, about 1.6 miles south of the centre. Nearby you will also find Hilfield Castle (3 miles south-west) and Shenley Hospital (1.6 miles north-west). Not far away are Darland's Lake and Arkley Lane and Pastures.
Towns and villages near Green Street
Also in Green Street
Quotes for window mastic in Green Street
You will get a clear quote before any work starts. It’s based on:
- Whether the work is at height
- Whether old sealant or filler has to be cut out
- Working hours on commercial sites
- Any mould that needs treating
Combining jobs into one visit generally makes better use of the time than several visits. You’ll get one clear quote for the whole job.
What we need to know
Photos help, but a description is a good start. Try to tell us:
- Where the job is, and your postcode
- If it’s domestic, commercial or a hotel
- How we’d reach the joints
- Any previous sealing or DIY work
To get a quote, call 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You will have a clear quote before work begins.
Common problems we fix in Green Street
Mastic ages in the weather. UV light hardens the outside of the bead, until it loses its stretch and starts to crack.
The problems people normally mention when they call are:
- Untidy mastic left by window fitters
- White mastic on grey or black frames
- Gaps between the frame and the inside reveal
- Mastic that has split away from the wall
If you live in an older home near St Michael and All Angels Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What your quote should include
- Whether the sealant suits the joint
- How the surfaces are prepared before sealing
- How the colour is chosen
- Whether VAT is included
Should I try it myself first?
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can be quoted together.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
How the visit works
At the end, we look at the finished work together and explain the cure time. The work normally takes most of a day for a typical house, less for a few frames, depending on how much there is to do. Somewhere like Green Street needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We start by checking each window and door with you.
- Next the failed sealant is cut away and the joint cleaned.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- We clear up and check every joint is fully closed.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- Tell us if parking is tricky
- Where the joints are inside, avoid wetting them before we arrive
Get a quote
We quote each job on its own. Simply call 0345 464 0079 or send us an email and describe the job and send pictures if you have them.
Related advice
Why deal with it now?
Working on frames from a ladder with a sealant gun isn’t easy, especially on upper floors. A professional job is cut out properly, backed where needed and finished neatly, in a sealant suited to the wall. Older cottages and farmhouses around Green Street can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we’ll go through it with you.
Why book with us
- Domestic, commercial and hotel work
- Anti-fungal sanitary silicone in wet areas
- Full insurance on every job
- We agree the colour with you first
Take a look at how sealant jobs are priced and what customers say.