Greater London · England
Nine Elms Window Mastic
Professional window mastic in and around Nine Elms, with every bit of old sealant taken out first.
- Water coming in at the bottom corners of a door
- Gaps between the frame and the inside reveal
- Hard, cracked sealant around windows
Surface by surface
Timber windows & doors
Timber moves with moisture as well as heat, so a flexible sealant is essential. The paint or stain needs to be sound where the sealant meets it.
Patio & French doors
Patio and French doors have the longest joints on most houses. The threshold and the bottom corners take the most water, so they get particular care.
Window mastic for homes and businesses in Nine Elms
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re fully insured ARBOMaster approved applicators, and we give a 12-month guarantee on the work. Typical jobs include mastic that has split away from the wall and mastic that’s falling out in pieces, on window sills, aluminium frames and timber windows & doors.
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 Nine Elms.
Whatever the size of the job, you get the same one-year guarantee in Nine Elms and across Greater London.
- Location
- Nine Elms (SW1V, SW8, SW11)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
When it isn’t the sealant
Before booking, it’s worth knowing the limits:
- A sash or casement that won’t close properly
- Penetrating damp from a failed cavity tray or render
- Rotten timber, which needs a joiner first
If you’re not sure, just ring 0345 464 0079 or email us and we will give you a straight answer.
What we seal
- uPVC windows
- Timber windows & doors
- Aluminium frames
- Patio & French doors
- Window sills
- Composite doors
Nine Elms homes and the weather
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. With historic houses such as Carlyle's House (about 1.1 miles west) nearby, there’s older building stock in the area around Nine Elms 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.
As a London address, Nine Elms can be tricky for parking: let us know about parking bays, permits or a driveway. For an older house near a landmark such as All Saints, the joint between an old wall and a newer frame is usually the first place rain gets in. For landlords with property near Battersea Park station, renewing tired window mastic between tenants heads off draught and damp complaints.
Nine Elms is about 1 mile south of Victoria, in Greater London. We provide window mastic to homeowners, landlords and businesses in Nine Elms and nearby. Our area takes in 764 places across Greater London, from the larger towns to small villages.
Our applicators cover all of the SW1V, SW8 and SW11 postcode area for window mastic. Window mastic is available to properties on Cupar Road, Ponton Road and Macduff Road. You’ll find Nine Elms on the A3212 and A3216, so it’s easy for us to get to. We also cover the places around Nine Elms: Pimlico (1 mile north-east), Victoria (1 mile north), South Lambeth (1 mile east), Chelsea (1 mile north-west) and Kennington (1 mile east). Larger places within reach include Kensington (3 miles north-west), St Pancras (3 miles north), Shoreditch (4 miles north-east), Walthamstow (9 miles north-east), Hoxton (4 miles north-east) and Whitechapel (4 miles north-east).
Landmarks near Nine Elms
We work in homes and buildings around Pimlico Academy, Sir Simon Milton Westminster UTC and Lambeth Palace Library, among other places. Nearby too are Pimlico Gardens (0.5 miles north-east) and The King William IV pub (within half a mile north-east). Nine Elms has its own railway station: Battersea Park station. Nearby you’ll also find Harrods (1.5 miles north-west) and Royal Hospital Chelsea (0.7 miles north-west). Open spaces near Nine Elms include Battersea Park Lake and Campden Hill.
Keeping the joints in good condition
Looking after new joints is easy:
- Keep drainage slots and sill grooves clear
- Wipe condensation off the frames
- Avoid harsh chemicals near the mastic
- Repaint timber before it’s bare
Most silicone sealants will not take paint, so mention any painting plans before we start. There are paintable sealants for joints that need it.
Wet, windy weather is when failed mastic shows itself, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
Why act early in Nine Elms
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. A reseal is a much smaller job. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Nine Elms, the repair is bigger than a sealant job.
Leaving a failed joint usually makes the job bigger, not smaller. If you’re not sure whether it needs doing, phone 0345 464 0079 or send us an email for an honest opinion and a quote.
Why Nine Elms customers choose us
- Experience in homes, commercial sites and hotels
- We are fully insured
- Trusted Arbo and Everbuild sealants
- An ARBOMaster approved applicator
Take a look at our cost guide or our reviews.
Common questions in Nine Elms
Is parking an issue for window mastic in Nine Elms?
Parking in Nine Elms, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Do you work for landlords with property near Battersea Park station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or drop us an email and tell us about the property, and we will send you a clear quote.
What should I tell you?
Just the basics: the address or postcode, what’s wrong and any access issues. After that, simply phone 0345 464 0079 or send us an email.
How many windows can you do in a day?
That depends on the number of frames, how they’re reached and the state of the old mastic. We will tell you how long your job needs when we quote.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
Can you do upstairs windows?
Normally, yes. We plan safe access before the job.
Where do you work from?
Our base is in Crawley, and we work across South East England, London and Scotland.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
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How the visit works
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and clear up. Most jobs take a few hours for a few frames, or a day or more for a whole house. 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.
- We start by checking each window and door with you.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Finally we tidy up and check each joint.
How to prepare
- Mention any leaks or damp you’ve noticed
- For indoor joints, keep the area dry beforehand if you can
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
We quote each job on its own, so the first step is telling us about yours. Just ring 0345 464 0079 or email us with the details and send photos if you have them.
Advice
How we quote for window mastic
For a quick quote, just ask. What matters most is:
- The number of rooms or windows
- Which sealant suits the joint
- Whether old sealant or filler has to be cut out
- Access and height
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Helping us quote
Photos help, but a description is a good start. Try to tell us:
- Access, such as stairs, a lift or height
- Any previous sealing or DIY work
- How many joints, rooms or windows are involved
- What’s wrong with the joints now
If you are in Nine Elms and need window mastic, call 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before any work starts.
DIY versus a professional finish
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
If you are 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 doesn’t work out, we can still put it right.