Greater London · England
Window & door mastic in Southfields, Greater London
We cover Southfields for mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly and a one-year guarantee.
- Hard, cracked sealant around windows
- Draughts coming in around windows and doors
- Black, perished sealant on frames
Southfields homes and the weather
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. Historic houses like Fulham Palace (about 1.9 miles north-west) are a reminder that the area around Southfields has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Southfields is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Homes close to St John the Divine include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Southfields is about 2 miles north-east of Wimbledon, in Greater London. For window mastic in and around Southfields, it’s easy to get a quote: please phone 0345 464 0079 or email us. We cover Greater London from our Crawley base. Southfields is one of 764 places in Greater London where we work. There’s also a page for London, roughly 6 miles from Southfields.
Every address in SW18, SW19 and SW17 is covered for window mastic. Local streets include Burr Road, Acuba Road and Mount Road, and we cover them all. We also cover the places around Southfields: Earlsfield (1 mile south-east), Wandsworth (1 mile north), Summerstown (1 mile south), Battersea (2 miles north-east) and Clapham Junction (2 miles north-east). Within a short drive, we also cover London (6 miles north-east), City of Westminster (5 miles north), Marylebone (5 miles north), Kensington (4 miles north), St Pancras (6 miles north-east) and Shoreditch (7 miles north-east).
Around Southfields
In Southfields, that means homes and buildings near Old Sergeant pub, Southfields Academy and Wandsworth School, among other places. There’s a railway station in Southfields itself: Earlsfield station. Nearby you’ll also find Royal Hospital for Neuro-disability (1 mile west) and Wimbledon Lawn Tennis Museum (1.2 miles south-west). Open spaces near Southfields include Henman Hill and Wandle Meadow Nature Park.
How we handle window mastic in Southfields
A cold draught around a closed window often comes from the frame edge. Resealing that joint can make a room feel noticeably less draughty and quietens the whistle on windy days. Where the air is getting in through the window itself, we will say so. If you’re dealing with untidy mastic left by window fitters and draughts coming in around windows and doors, we can put it right.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
Your job is guaranteed for a year, as with all our work.
- Where
- Southfields (SW18, SW19, SW17)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
The process
On the day, there’s very little for you to do. Show us the job and we will take it from there. The work itself takes a morning for a couple of windows and a door, including the tidy-up. In Southfields, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Preparing for the visit
- Keep pets and children clear of the area while we work
- For business premises, tell us about site rules or sign-in
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
Asking for a quote is easy: tell us what needs doing and where. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.
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Southfields questions
I let a flat near Earlsfield station. Can you help?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before we start.
Can parking be tricky for a visit in Southfields?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you guarantee window mastic?
Yes. All our work carries a 12-month guarantee, and we are ARBOMaster approved applicators.
Will resealing my frames help with draughts?
In many cases. The gap between frame and wall is a common source of draughts, and sealing the inside and outside joints closes that path.
How many windows can you do in a day?
The work takes a morning for a couple of windows and a door. Access and the amount of old mastic make the biggest difference.
How long should I leave it?
That depends on the sealant used, so please follow the time we give you.
How do I get a quote for window mastic in Southfields?
Size, access and the old material all affect the cost. Ask us for a quote.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that usually means someone at home.
What affects the quote in Southfields
Your quote is based on your job. We take into account:
- When we can work, for business premises
- How many areas need sealing
- Mould in or behind the old joints
- How much old sealant there is and how hard it is to remove
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs. Ask us for a quote and we will explain what it covers.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- How many joints, rooms or windows are involved
- What the problem is, such as mould, gaps, leaks or cracking
- The type of property
- A few pictures by email, if you can
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we’ll talk you through the work.
When to call us in Southfields
Plenty of failed mastic was poorly applied in the first place. Mastic laid onto dusty, damp or crumbling surfaces didn’t grip properly, so it comes away long before its time.
Signs it’s time to call us include:
- Untidy mastic left by window fitters
- Rain getting in at the frame or under the sill
- Hard, cracked sealant around windows
- A bead that does not match the frame
Letting a property close to Earlsfield station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Before booking anyone
- How long the guarantee is
- Whether they seal over old material or remove it
- Whether the sealant suits the joint
- Which colour the sealant will be
Honest limits
Before you book, it’s worth knowing the limits too:
- Rotten timber, which needs a joiner first
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Damp problems in the wall away from the window
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly before you book.
Where we work in Southfields
- Aluminium frames
- Window sills
- Patio & French doors
- Composite doors
- uPVC windows
- Timber windows & doors
Towns and villages near Southfields
Other services in Southfields
What the job involves on each surface
Timber windows & doors
Soft or rotten wood can’t be sealed successfully. If we find rot, we’ll tell you before going ahead, as a joiner will need to deal with it.
Window sills
Every drop off the glass ends up on the sill, so the joints at each end and underneath matter. They’re cut out and resealed with exterior sealant.
How to look after the new joints
How long the joints last depends on use and care. We suggest:
- Walk round the house once a year and look at the joints
- Don’t use solvent cleaners on the joint
- Make sure the drainage slots aren’t blocked
- Use gentle cleaners on frames and sealant
Try not to touch the new joint while it cures, for as long as we advise. Do not point a pressure washer at the joints.
On timber windows, water behind the joint can lead to rot. Rotten timber needs a joiner, not a sealant, so it pays to reseal before that happens.
DIY versus a professional finish
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
If you’ve already had a go yourself, that is fine. We cut it out and start again.