Greater London · England
Dollis Hill Window Mastic
Mastic around window and door frames, sills and patio doors in Dollis Hill, with a one-year guarantee on every job. Ask us for a quote.
- Cracked sealant at the sill ends
- Damp patches on the reveal after heavy rain
- Cold air getting in at the frame edge
About our window mastic in Dollis Hill
Every window and door frame has a gap around it, and mastic is what closes it. Once that seal fails, wind and rain find the gap. The old mastic is removed and the joint resealed with a flexible exterior sealant. If you have whistling draughts around closed windows and damp patches on the reveal after heavy rain, we can put it right, whatever the surface.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease normally says who is responsible for the windows, so it’s worth checking before booking, and access in Dollis Hill is something to talk through when you book.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Where
- Dollis Hill (NW2, NW10, NW9)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Dollis Hill questions
Do you cover Dollis Hill for window mastic?
Yes, Dollis Hill is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we’ll send you a clear quote.
Can you help a landlord with a rental near Brent Cross West station?
Yes, rental work is part of what we do. 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.
Are you ARBOMaster approved?
Yes. We are approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
What should I tell you?
The location, the problem and the rough size of the job. If you can, email a few pictures.
How long will my window job take?
Allow most of a day for a typical house, less for a few frames. Access and how stubborn the old mastic is affect the time most.
Can you get sealant to suit coloured frames?
Yes, in most cases. Tell us the frame colour when you get in touch and we’ll match it as closely as we can.
How much does window mastic cost in Dollis Hill?
Every job is different, so each one gets its own quote. To get one, call 0345 464 0079 or send us an email and tell us what needs doing and where.
Can I do it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
How it works
Good joint work is mostly preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. In total, it normally takes most of a day for a typical house, less for a few frames. In a London area like Dollis Hill, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- Try not to wet indoor joints just before the visit
- Let us know about stairs, lifts or work at height
- Let us know about earlier repairs to the joints
Get a quote
For a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. We will give you a clear quote before any work starts.
Read more
Should I try it myself first?
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 fails, we can still redo it.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Towns and villages near Dollis Hill
What else we do in Dollis Hill
Aftercare tips
A little care helps the new joints last. Our advice:
- Walk round the house once a year and look at the joints
- Do not paint over the silicone
- Keep paint and stain on wooden frames in good order
- Don’t aim a pressure washer at the joints
Most silicone sealants will not take paint, so if you are planning to paint the frames or walls, tell us beforehand. We can use a paintable sealant where that matters.
A small gap around a frame only grows. As the old mastic shrinks further, more air gets through, and heat escapes around the frame. Resealing closes it.
When to call us in Dollis Hill
Plenty of failed mastic was poorly applied in the first place. Sealant run over dust, wet brick or loose mortar didn’t grip properly, so it comes away long before its time.
If you can see any of these, it’s time to have the joints looked at:
- Gaps where the sill meets the wall
- Damp patches on the reveal after heavy rain
- Mastic that’s falling out in pieces
- Draughty joints inside around the window
Homes close to Church of St Michael include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before booking anyone
- Which sealant they’ll use, and why
- What insurance they hold
- Whether they seal over old material or remove it
- How long to leave it before use
Work for landlords, hotels and businesses
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Letting agents and landlords in Dollis Hill can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for.
When it isn’t the sealant
In fairness, there are a few things sealant won’t fix:
- A failed sealed unit that has misted up
- Soft or decayed wood in the frame
- Damp problems in the wall away from the window
If you’re not sure, just call 0345 464 0079 or email us and we will give you a straight answer.
Where we work in Dollis Hill
- Window sills
- uPVC windows
- Patio & French doors
- Composite doors
- Timber windows & doors
- Aluminium frames
What window mastic looks like in Dollis Hill
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Heath House (about 2.3 miles east) are a reminder that the area around Dollis Hill has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
As a London address, Dollis Hill can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. If you let a flat or house near Brent Cross West station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Dollis Hill is about 1 mile north-east of Neasden, in Greater London. For window mastic in and around Dollis Hill, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We cover Greater London from our Crawley base, Dollis Hill included. Our Greater London coverage runs to 764 places, Dollis Hill among them. London is on our list too, about 7 miles from Dollis Hill.
Every address in NW2, NW10 and NW9 is covered for window mastic, from the main roads to the quietest streets. Whether your property is on Brook Road, Lane Close and Crest Road or a nearby road, we can help. We also cover Staples Corner (1 mile north-east), Neasden (1 mile south-west), Cricklewood (1 mile south-east), Willesden (1 mile south) and Brent Cross (1 mile north-east). We also work in nearby towns such as London (7 miles south-east), City of Westminster (5 miles south-east), Marylebone (5 miles south-east), Kensington (5 miles south), St Pancras (6 miles south-east) and Shoreditch (7 miles east).
Landmarks near Dollis Hill
Around Dollis Hill, our work takes us to homes and buildings near Woodfield School, The Crown Public House and Gladstone Park. Dollis Hill has its own railway station: Brent Cross West station. Nearby you’ll also find Brent Cross Shopping Centre (1 mile north-east) and St Andrew's Hospital (within half a mile south). Green spaces nearby include Darland's Lake and Parliament Hill.
Why it’s worth doing now in Dollis Hill
Resealing frames is a short job: the visit takes anything from an hour or two to a full day, depending on how many frames there are. Leave it until water is coming in and you may need plastering and decorating as well. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Dollis Hill, the repair is bigger than the sealant job would have been.
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why book with us
- Over 20 years’ experience
- White, clear, grey or another colour, product permitting
- Colour picked to suit the job
- We are fully insured
Take a look at our cost guide and customer reviews.