Greater London · England
Window Mastic in East Dulwich
Window mastic for East Dulwich, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Mastic that’s falling out in pieces
- Sealant in the wrong colour for the frame
- Gaps left after new windows were fitted
Window mastic in East Dulwich, done properly
Some gaps around frames are far deeper than they look. Filling it with sealant alone leaves a joint that cannot move properly, so deep gaps get backing rod first. The sealant then grips the two sides it should. If you are dealing with water coming in at the bottom corners of a door and a bead that doesn’t match the frame, we can help.
London has a lot of flats and conversions, where windows are often on upper floors. Who looks after the outside of the frames can depend on the lease, so check that first.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we’ll put it right.
- Where
- East Dulwich (SE5, SE22, SE15)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Do you need window mastic in East Dulwich?
A lot of older mastic was never designed to stay flexible. Once it has hardened, the frame’s movement tears it from the wall, leaving a hairline gap down one side.
Any of these means the joints need attention:
- Gaps between the frame and the inside reveal
- Cracked or shrunken mastic around the frame
- Black, perished sealant on frames
- Cold air getting in at the frame edge
Letting a property close to East Dulwich station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Comparing quotes
- The length of the guarantee
- Whether the sealant suits the joint
- How much experience the applicator has
- Are they insured?
Places near East Dulwich
More services for East Dulwich
How it works
Every visit runs the same way: we look at the joints together, protect the area around them, carry out the job and tidy away. It usually takes a morning for a couple of windows and a door. In East Dulwich, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- First we look at every frame and agree the list.
- The old mastic is cut out and the surfaces cleaned back.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- We clear up and check every joint is fully closed.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Mention any leaks or damp you’ve noticed
- Keep children and pets away from the work area
Ask for a quote
Want a quote for window mastic? Please ring 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Advice
Your questions about window mastic in East Dulwich
I let a flat near East Dulwich station. Can you help?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before any work starts.
Do you cover East Dulwich for window mastic?
Yes, East Dulwich is within the area we cover. We work across 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 send you a clear quote.
Can you seal over the old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Do you seal inside as well as outside?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We do one or both.
How do I get a quote for window mastic in East Dulwich?
Size, access and the old material all affect the cost. Ask us for a quote and we will talk you through it.
Can resealing stop a draught around my window?
Often, yes. The gap between frame and wall is a common source of draughts, and resealing inside and out closes it.
Can you quote for more than one area?
Yes. Just list everything you need.
Do you take out the old sealant first?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Quotes for window mastic in East Dulwich
Your quote is based on your job. We take into account:
- How much old sealant there is and how hard it is to remove
- Mould in or behind the old joints
- The number and length of the joints
- Working hours on commercial sites
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we will explain what it covers.
What we need to know
Photos help, but a description is a good start. Try to tell us:
- The rough size of the job
- The type of property
- Pictures of the joints, sent by email
- How we’d reach the joints
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we’ll talk you through the work before giving you a price.
Why act early in East Dulwich
Choosing the product is half the job. Interior caulk and bathroom silicone aren’t made for exterior frame joints. An exterior, low-modulus sealant stays flexible in sun and frost. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in East Dulwich, the repair is bigger than a sealant job.
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, call 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Why East Dulwich clients choose us
- We leave the area clean and tidy
- Rated 4.9 stars on Google
- An ARBOMaster approved applicator
- Any old sealant cut out fully, not covered over
When something else is needed
Sealant isn’t the answer to every problem, and we will tell you before work begins. Sealant will not put right:
- Worn gaskets, brush seals or a door that has dropped
- Faulty window hardware
- Misting between the panes of a double-glazed unit (that needs a new unit)
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think.
What we seal
- Aluminium frames
- Patio & French doors
- Timber windows & doors
- Window sills
- uPVC windows
- Composite doors
How the job changes by surface
Window sills
Every drop off the glass ends up on the sill, so the sill ends and the joint under the frame are vital. Each is cleaned out and resealed.
Timber windows & doors
Timber moves with moisture as well as heat, so a flexible sealant is essential. We seal onto sound, dry paintwork or timber.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Make sure the drainage slots are not blocked
- Air rooms to keep condensation down around windows
- Look round the frames every year or so
- Keep paint and stain on wooden frames in good order
Wipe the frames with soapy water when you clean the windows, and avoid solvent cleaners on the sealant.
Leaks usually show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.
Frames and glazing around East Dulwich
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. In a converted house or block, who looks after the windows depends on the lease, so check that before you book.
In the older streets around The Latter Rain Outpouring Revival Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Managing a site like Dog Kennel Hill School? Then larger buildings have plenty of frames, and the mastic around each one ages.
East Dulwich is about 3 miles south of London, in Greater London. Our applicators cover window mastic for homes and businesses in East Dulwich. Our Greater London coverage runs to 764 places, East Dulwich among them.
Our applicators cover all of SE5, SE22 and SE15 for window mastic and the streets around it. Whether your property is on Rye Lane, Wren Road and Adys Road or anywhere close by, our applicators can take on the job. East Dulwich is on the A2214 and A2215, so it’s easy for us to get to with everything needed for window mastic. We also cover Denmark Hill (1 mile north-west), Herne Hill (1 mile south-west), Dulwich Village (1 mile south), Camberwell (1 mile north) and Peckham (1 mile north-east). Larger places within reach include London (3 miles north), City of Westminster (5 miles north-west), Marylebone (5 miles north-west), Kensington (6 miles north-west), St Pancras (5 miles north) and Shoreditch (4 miles north).
Near you in East Dulwich
Locally, jobs take us to homes and businesses close to The Fox on the Hill pub, The Charter School East Dulwich and The Charter School. There’s a railway station in East Dulwich itself: East Dulwich station. Nearby you will also find House of Dreams Museum (under half a mile south-east) and Surrey Quays Shopping Centre (2.8 miles north-east). Not far away are Knight's Hill and Centre for Wildlife Gardening.