Greater London · England
Roxbourne Window Mastic
Professional window mastic in and around Roxbourne, with every bit of old sealant taken out first and a 12-month guarantee.
- Old mastic that has gone black or come away
- Cracked sealant at the sill ends
- Cracked internal joints between frame and plaster
Window mastic in Roxbourne
The new joint does not have to be white. We can seal in white, brown, anthracite grey, black or clear, so the bead blends with the window rather than framing it. We work on composite doors, timber windows & doors and uPVC windows, and people most often call us about untidy mastic left by window fitters and mastic that’s falling out in pieces.
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.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Location
- Roxbourne (HA5, HA2, HA4)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Why it’s worth doing now in Roxbourne
Choosing the product is half the job. Interior caulk and bathroom silicone are not made for exterior frame joints. A low-modulus exterior sealant keeps its stretch through hot and cold weather. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble for homes in Roxbourne.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Why choose Mr Mastic in Roxbourne
- Arbo and Everbuild products
- Experience in homes, commercial sites and hotels
- A 12-month guarantee on all work
- Sanitary silicone with an anti-fungal additive in wet areas
Nearby places to Roxbourne
More services for Roxbourne
Can I do it myself?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
How the job changes by surface
Aluminium frames
Coated aluminium needs a compatible sealant, and acetoxy silicones aren’t used, as they can attack some metals. We use a neutral-cure product.
Window sills
Masonry sills can have joints where water gets in, and the joint under the frame can let rain run behind. Those are sealed with a product suited to stone or concrete.
Honest limits
Some problems need a builder, plumber or other trade rather than us:
- A sash or casement that will not close properly
- Draughts through the window seals rather than the frame
- A frame that has rotted at the joint
If you’re not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Timber windows & doors
- Patio & French doors
- Window sills
- uPVC windows
- Aluminium frames
- Composite doors
Questions from Roxbourne
Do you cover Roxbourne for window mastic?
Yes, Roxbourne is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or drop us an email and let us know what needs doing, and we will send you a clear quote.
I let a flat near South Ruislip station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we will send you a clear quote.
How do I get a quote for window mastic in Roxbourne?
Every job is different, so each one gets its own quote. For a quick quote, call 0345 464 0079 or email us and tell us what needs doing and where.
Will there be a smell?
Some sealants have a smell while they cure. Ventilation helps.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
How long will my window job take?
A handful of frames is a short visit. We confirm the timing with your quote.
Do I have to be there?
That depends on where the joints are. For work indoors, someone needs to let us in, and for outside work we’ll agree access with you when we book.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
How the visit works
The work is kept neat and contained to the area we’re working on. Expect the work to take anything from an hour or two to a full day, depending on how many frames there are, and we explain the cure time before we leave. In Roxbourne, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Getting ready for the visit
- For business premises, tell us about site rules or sign-in
- Mention any leaks or damp you’ve noticed
- Clear items away from the joints we are working on
Getting a quote
We do not publish a price list, as no two jobs are quite the same. Instead, we send you a clear quote for your job. To arrange one, phone 0345 464 0079 or send us an email.
Related advice
Work for landlords, hotels and businesses
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
If you manage several properties in or around Roxbourne, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
Windows and doors in Roxbourne
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Roxbourne is in London, so parking needs planning: let us know about parking bays, permits or a driveway. Schools such as The Moriah Jewish Day School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Roxbourne is about 1 mile east of Ruislip, in Greater London. Across the HA5 area, our applicators can take on window mastic. Roxbourne is one of 764 places in Greater London we cover. Our London page covers work nearby (13 miles or so).
Postcode districts we cover here for window mastic: HA5, HA2 and HA4. If you need window mastic at a property on Kings Road, The Avenue and Torbay Road or a nearby road, we can help. If you are just outside Roxbourne, we cover Rayners Lane (1 mile east), Eastcote (1 mile north-west), North Harrow (1 mile north-east), South Ruislip (1 mile south) and Pinner (1 mile north). Further out, we also cover London (13 miles south-east), City of Westminster (11 miles south-east), Marylebone (11 miles east), Kensington (9 miles south-east), St Pancras (12 miles east) and Shoreditch (14 miles east).
Around Roxbourne
In Roxbourne, that means homes and buildings near Heathfield School, Pinner High School and Venue 5 pub, among other places. The nearest railway station is South Ruislip station, roughly 1.4 miles south-west. A little further out are Heath Robinson Museum (1.2 miles north) and St. George's Shopping Centre (1.9 miles east). Not far away are Northala Fields and Islip Manor Meadows.
What we’re called out for in Roxbourne
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and the wood moves with damp as well as heat.
The problems people generally mention when they call are:
- Old mastic that has gone black or come away
- Leaking joints at the ends of sills
- Gaps between the frame and the inside reveal
- White mastic on grey or black frames
For an older house near a landmark such as St. Andrew’s Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before booking anyone
- Whether they’re fully insured
- Whether VAT is included
- Is the old sealant removed completely?
- Who does the work, and how experienced they are