Greater London · England
Window & door mastic in Green Street Green, Greater London
Mastic around window and door frames, sills and patio doors in Green Street Green, with a one-year guarantee on every job. Ask us for a quote.
- Cracked sealant at the sill ends
- White mastic on grey or black frames
- Hard, cracked sealant around windows
The process
We keep the work tidy and contained to the joints we’re treating, so you can carry on as normal. Expect the work to take 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 Green Street Green. It helps if you can point us to a visitor permit or a bay close to the door.
- We start by checking each window and door with you.
- We remove the old mastic and clean the frame and the wall.
- Where gaps are deep, backing rod goes in first.
- 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
- For business premises, tell us about site rules or sign-in
- Let us know about earlier repairs to the joints
- Move anything stored near the joints
Ask for a quote
For window mastic in Green Street Green, phone 0345 464 0079 or email us. Tell us what the problem is and where, and you will get a clear quote before we start.
Advice
Window mastic for homes and businesses in Green Street Green
Homes in Green Street Green have every kind of window: from uPVC casements to timber and aluminium, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. If you have black, perished sealant on frames and hard, cracked sealant around windows, we can put it right, whatever the surface.
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, in Green Street Green as anywhere.
Whatever the size of the job, it’s backed by our 12-month guarantee.
- Location
- Green Street Green (BR6)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Landlords, agents and businesses in Green Street Green
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.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we’re fully insured.
Common questions in Green Street Green
Can you do window mastic in Green Street Green?
Yes, Green Street Green is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear quote.
Do you work for landlords with property near Chelsfield station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Can new sealant go over the old?
No. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
Is it messy?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
How much does window mastic cost in Green Street Green?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we’ll explain our choice.
How many windows can you do in a day?
A few frames take a few hours. We confirm the timing with your quote.
Is the work guaranteed?
Yes. Every job comes with our one-year guarantee, and we’re ARBOMaster approved applicators.
Also near Green Street Green
More services for Green Street Green
What window mastic looks like in Green Street Green
With historic houses such as Down House (about 2.1 miles south-west) nearby, there’s older building stock in the area around Green Street Green 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.
Managing a site like Green Street Green Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages. Green Street Green is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Green Street Green is about 2 miles south of Orpington, in Greater London. Every kind of property in Green Street Green can book us for window mastic, old or new, large or small. Every job comes with our 12-month guarantee. Our area takes in 764 places across Greater London, from the larger towns to small villages. For nearby work, see our London page.
Work in BR6 is quoted and booked the same way as anywhere else. We cover properties on Vine Road, Laxey Road and Shire Lane and the roads around them. Neighbouring places we cover for window mastic include Farnborough (1 mile north-west), Hazelwood (1 mile south-west), Crofton (2 miles north), Downe (2 miles south-west) and Farthing Street (2 miles west). Larger places within reach include London (13 miles north-west), City of Westminster (15 miles north-west), Marylebone (15 miles north-west), St Pancras (15 miles north-west), Shoreditch (14 miles north-west) and Hoxton (15 miles north-west).
Landmarks near Green Street Green
Around Green Street Green, our work takes us to homes and buildings near Queens Head pub and Hewitt's Chalk Bank and the streets around them. Green Street Green’s nearest station is Chelsfield station, roughly 0.9 miles east. Other landmarks nearby include Orpington Hospital (0.8 miles north-east) and Crofton Roman Villa (1.5 miles north). For a walk, there’s Summer Hill and Downe Bank Nature Reserve.
What we are called out for in Green Street Green
Plenty of failed mastic was poorly applied in the first place. Sealant run over dust, wet brick or loose mortar didn’t grip properly, and it lets go sooner than it should.
These are the problems we’re asked about most:
- Cracked sealant at the sill ends
- Water coming in at the bottom corners of a door
- Gaps between the frame and the inside reveal
- Whistling draughts around closed windows
In the older streets around St Mary's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What to look for in a quote
- Who turns up on the day
- How the colour is chosen
- What guarantee comes with the work
- Whether VAT is included
How to look after the new joints
Aftercare is simple:
- Do not use solvent cleaners on the joint
- Avoid blasting the frames with a pressure washer
- Wash the frames with mild soapy water
- Make sure the drainage slots aren’t blocked
Keep the new mastic undisturbed while it cures, for as long as we advise. Keep jet washers away from the frames.
On timber windows, water behind the joint can lead to rot. Rotten timber needs a joiner, not a sealant, so early resealing is worth it.
When it isn’t the sealant
We won’t take on work that will not last, so these are the limits:
- A failed sealed unit that has misted up
- Penetrating damp from a failed cavity tray or render
- Faulty window hardware
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think.
Surfaces we seal
- Timber windows & doors
- Window sills
- Composite doors
- Patio & French doors
- uPVC windows
- Aluminium frames
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
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.
Why deal with it now?
A cracked joint around a frame lets rain into the wall. Over time that can mean damp patches, damaged plaster and rotting timber. Resealing now is a small job by comparison. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or send us an email and we will talk you through it.
Why us?
- One-year guarantee on every job
- Homes, businesses and hotels
- Full insurance on every job
- A choice of colours where the product allows
Take a look at how sealant jobs are priced or our reviews.