Greater London · England
Window & door mastic in Crofton Park, Greater London
Window and door frames in Crofton Park need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Mastic that has split away from the wall
- White mastic on grey or black frames
- Draughts coming in around windows and doors
DIY versus a professional finish
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
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.
Window mastic in Crofton Park
Whether it’s one leaking patio door or every frame on the house, you will get a clear quote before work begins. Just ring 0345 464 0079 or email us and tell us how many frames there are and how they’re reached for window mastic in Crofton Park. If you have water coming in at the bottom corners of a door and whistling draughts around closed windows, we can put it right.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, which is when draughts and damp patches appear in homes in Crofton Park.
Every job is covered by a one-year guarantee, wherever you are in Greater London.
- Location
- Crofton Park (SE4, SE6, SE23)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Towns and villages near Crofton Park
Also in Crofton Park
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Air rooms to keep condensation down around windows
- Keep drainage slots and sill grooves clear
- Wash the frames with mild soapy water
- Keep paint off silicone joints
Most silicone sealants won’t take paint, so mention any painting plans before we start. 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 early resealing is worth it.
How the job changes by surface
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the threshold joint takes a lot of water. We prepare and reseal every joint, backing the deep ones.
Composite doors
A composite door generally sits in a plastic outer frame, and the joint around it is sealed like a window. We match the colour to the frame.
What affects the quote in Crofton Park
We quote each job individually. These are the things that affect it:
- The type of sealant required
- The old material and how stubborn it is
- The size of the job
- When we can work, for business premises
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part.
Asking for a quote
To help us quote quickly, please include:
- Where the property is
- The problem you’ve noticed
- Photos by email, if that is easy
- The type of property
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
How it works
The work is kept neat and contained to the joints we’re treating, so you can carry on as normal. Expect the work to take anything from an hour or two to a full day, depending on how many frames there are, and we tell you how long to leave it before we go. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- First we look at every frame and agree the list.
- The old mastic is cut out and the surfaces cleaned back.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
Preparing for the visit
- Move anything stored near the joints
- Mention any parking rules near the property
- Mention any sign-in or site rules at work premises
Get a quote
If you’re in Crofton Park and need window mastic, ring 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.
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Common questions in Crofton Park
Is parking an issue for window mastic in Crofton Park?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
I let a flat near Crofton Park station. Can you help?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we’ll send you a clear quote.
Will it make a mess?
Tidy work is part of the job. We protect what’s around the joints.
Can you match the sealant to my frames?
Yes, we choose a colour to suit the frame. Anthracite grey, black, brown and white cover most frames, with clear as an option.
Do you work on first-floor windows?
Yes, as long as they can be reached safely. Let us know about access when you ask for a quote so we can plan the job.
Can I add another job to the visit?
Yes, and it often makes sense. Doing several areas at once is normally more efficient.
Do you have insurance?
Yes. Mr Mastic is fully insured.
Can resealing stop a draught around my window?
Yes, where the draught is at the frame edge. We find where the air is coming from before we reseal.
Signs you need window mastic in Crofton Park
Mastic ages in the weather. Sunlight dries the surface out, until it loses its stretch and starts to crack.
The problems people normally mention when they call are:
- Old mastic that has gone black or come away
- Whistling draughts around closed windows
- Rushed sealant from a window installation
- Sealant in the wrong colour for the frame
If you look after a building such as Stillness Infant School, its window and door frames need their mastic kept sound, just like a home’s.
Questions to ask before you book
- Is the old sealant removed completely?
- Who turns up on the day
- What happens if the job turns out different
- How long the guarantee is
What window mastic looks like in Crofton Park
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Queen's House (about 2.4 miles north-east) are a reminder that the area around Crofton Park has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
As a London address, Crofton Park can be tricky for parking: let us know about parking bays, permits or a driveway. If you let a flat or house near Crofton Park station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Crofton Park is about 1 mile south of New Cross, in Greater London. Jobs in Crofton Park get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 764 places across Greater London.
Every address in SE4, SE6 and SE23 is covered for window mastic. Whether your property is on Ivy Road, Nash Road and Lindal Road or anywhere close by, our applicators can take on the job. Other places close to Crofton Park include Brockley (1 mile north-west), Ladywell (1 mile east), Honor Oak (1 mile west), Forest Hill (1 mile south-west) and Nunhead (1 mile north-west). We also work in nearby towns such as London (4 miles north-west), City of Westminster (7 miles north-west), Marylebone (7 miles north-west), Kensington (8 miles north-west), St Pancras (6 miles north-west) and Shoreditch (5 miles north).
Near you in Crofton Park
Typical jobs here are in homes near Blythe Hill Tavern, Prendergast Ladywell School and Blythe Hill Fields and the streets around them. There’s a railway station in Crofton Park itself: Crofton Park station. Other landmarks nearby include University Hospital Lewisham (0.7 miles east) and Horniman Museum and Gardens (1.4 miles south-west). For a walk, there’s One Tree Hill and Knight's Hill.
When something else is needed
We will always be straight with you, so here’s what new sealant will not do:
- Condensation trapped between the panes
- Damp coming through the wall itself rather than the frame joint
- Faulty window hardware
If in doubt, call 0345 464 0079 or email us and we’ll say what we think.
Surfaces we seal
- Aluminium frames
- Patio & French doors
- Window sills
- uPVC windows
- Timber windows & doors
- Composite doors