Greater London · England
Farthing Street Window Mastic
Mastic around window and door frames, sills and patio doors for homeowners, landlords and businesses in Farthing Street. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Cracked sealant at the sill ends
- Mastic that’s falling out in pieces
- A bead that doesn’t match the frame
How the job changes by surface
Timber windows & doors
Timber moves with moisture as well as heat, so the joint must stay flexible. We seal onto sound, dry paintwork or timber.
Patio & French doors
Door frames take knocks and movement every time the doors are used. A flexible sealant copes with that.
Window mastic for homes and businesses in Farthing 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. So the sealant has to stretch and recover, which is why we use a low-modulus product. Typical jobs include mastic that has split away from the wall and gaps where the sill meets the wall, across composite doors, patio & French doors and aluminium frames.
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.
We guarantee the work for a year. If something is not right with it in that time, tell us and we’ll put it right.
- Place
- Farthing Street (BR6)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Common questions in Farthing Street
Is Farthing Street in your area for window mastic?
Yes, Farthing Street is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Is parking a problem for a job in Farthing Street?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
How long before the joint can be used?
Cure times vary by product and the temperature. We tell you how long to leave it before we go.
Is it worth trying it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few photos.
Are you fully insured?
Yes. We are fully insured, and we’ve been doing sealant work for more than 20 years.
Can resealing stop a draught around my window?
Yes, if the air is getting in around the frame. If it’s coming through the window seals, we’ll tell you.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses.
Common problems we fix in Farthing Street
Sills take more water than any other part of a window, so the sill ends and the joint below the frame are common leak points. Failed sealant there lets rain into the wall or behind the frame.
Look out for these signs:
- Rushed sealant from a window installation
- Leaking joints at the ends of sills
- Mastic that’s falling out in pieces
- Cracked internal joints between frame and plaster
Rented homes near Orpington station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
Before booking anyone
- Is VAT in the price?
- How the joint is cleaned and prepared
- Whether all the old sealant comes out first
- What insurance they hold
Frames and glazing around Farthing Street
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. In a converted house or block, who looks after the windows depends on the lease, so check that before booking.
If you live in an older home near St Mary's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For site and facilities teams at buildings such as Downe Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Farthing Street is about 4 miles south-west of Orpington, in Greater London. Homes, rented property, offices and hotels in Farthing Street can book us for window mastic. The work is guaranteed for a year. We cover 764 towns and villages across Greater London. London is on our list too, about 12 miles from Farthing Street.
All of BR6 is covered for window mastic. We cover properties on Farthing Street, New Road Hill and Orange Court Lane and the roads around them. Other places close to Farthing Street include Downe (1 mile south-east), Leaves Green (1 mile south-west), Hazelwood (1 mile south-east), Keston (1 mile north-west) and Farnborough (1 mile north-east). We also work in nearby towns such as London (12 miles north-west), City of Westminster (15 miles north-west), Marylebone (15 miles north-west), Kensington (15 miles north-west), St Pancras (14 miles north-west) and Shoreditch (14 miles north-west).
Local landmarks in Farthing Street
Typical jobs here are in homes near Darrick Wood School, South Park and The Queens Head pub. The nearest railway station is Orpington station, roughly 2.6 miles north-east of the centre. Well-known places in the area include Princess Royal University Hospital (1.4 miles north) and Crofton Roman Villa (2.5 miles north-east). Not far away are Betsom's Hill and West Kent Golf Course nature reserve.
How to look after the new joints
Looking after new joints is easy:
- Keep jet washers away from the mastic
- Keep timber frames painted
- Avoid harsh chemicals near the mastic
- Clear any debris from frame drain holes
Silicone cannot normally be painted, so if you’re planning to paint the frames or walls, tell us beforehand. There are paintable sealants for joints that need it.
Water trapped behind a failed joint can start rot in timber frames and sills. Once wood has rotted, it needs repair before it can be sealed, so it pays to reseal before that happens.
The process
We work through the job in order: 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. In a London area like Farthing Street, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
How to prepare
- Move anything stored near the joints
- Mention any leaks or damp you’ve noticed
- Mention any tricky access
Getting a quote
Need a quote? Please call 0345 464 0079 or send us an email and tell us about the job. We’ll explain what we’d do and give you a clear quote before we start.
Related advice
For landlords and businesses
We also work for property managers and facilities teams in Farthing Street and across Greater London. Several sites can be quoted together.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
Nearby places to Farthing Street
More services for Farthing Street
Honest limits
Some problems need a builder, plumber or other trade rather than us:
- Soft or decayed wood in the frame
- Broken hinges, locks or handles
- Condensation trapped between the panes
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think before booking.
Joints and surfaces we work on
- Aluminium frames
- Patio & French doors
- Window sills
- uPVC windows
- Composite doors
- Timber windows & doors
What happens if it’s left?
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. Resealing now is a small job by comparison. In a flat in Farthing Street, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Homes and businesses are quoted the same way: 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 will explain what it covers.
Why us?
- Trusted Arbo and Everbuild sealants
- ARBOMaster approved applicator
- We never seal over old sealant
- 4.9 on Google from 180+ five-star reviews