Greater London · England
Park Royal Sand Mastic
Window and door surrounds in Park Royal need attention? We remove the old material, prepare the joints and seal them properly.
- Window mastic to renew ahead of painting
- Mastic dropping out of the joint
- Silicone on a period window that looks wrong
Common questions in Park Royal
I let a flat near Harlesden station. Can you help?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before work begins.
Can parking be tricky for a visit in Park Royal?
Parking in Park Royal, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Do you do commercial work?
Yes. Larger jobs can be planned room by room or area by area to suit the site.
Can you do several jobs on one visit?
Yes, we can. More than one area can go on one quote.
How long will you be here?
As a guide, most jobs take a few hours per window, depending on the condition of the joints. Larger jobs naturally take longer, and we will say how long yours will take.
Will it make a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Do you hold any approvals?
Yes. We are an ARBOMaster approved applicator.
Where is Mr Mastic based?
We are based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Sand mastic in Park Royal, done properly
We work across Park Royal renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand, finished to suit the masonry. We work on sash and case windows, timber door frames and brick reveals, and common reasons people get in touch are mastic that needs renewing before redecorating and open joints round the window box.
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 Park Royal.
The work is covered for a year after we finish. If anything is not right with it, call 0345 464 0079 or send us an email.
- Where
- Park Royal (NW10, W3, W5)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to Park Royal
Other services in Park Royal
Honest limits
We will not take on work that will not last, so these are the limits:
- Whether work needs listed building consent
- Masonry that needs repairing
- Timber that has rotted
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly.
What we seal
- Stone surrounds
- Sash and case windows
- Timber door frames
- Period & listed homes
- Brick reveals
- Tenement windows
For landlords and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
For anyone letting property in or around Park Royal, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and pictures by email help.
What happens on the day
On the day, we start by going over the job with you, so you know exactly what we are doing. We protect the surfaces around the joints before work begins. The work normally takes a few hours for a single window, longer for several. For a job in Park Royal, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
How to prepare
- For business premises, tell us about site rules or sign-in
- Mention if the joints have been sealed before
- Try not to wet indoor joints just before the visit
Getting a quote
To get 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 price before any work starts.
Advice
Frames and glazing around Park Royal
With historic houses such as Pitzhanger Manor (about 2 miles south-west) nearby, there’s older building stock in the area around Park Royal 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. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Homes close to St Gabriel's Church include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. Managing a site like West Twyford Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Park Royal is about 1 mile south-west of Harlesden, in Greater London. Wherever you are in the NW10 postcode area, we can carry out sand mastic at your property. 764 places in Greater London are on our list, from the larger towns to small villages. We also work in London, around 8 miles away.
Jobs for sand mastic in NW10, W3 and W5 is quoted and booked the same way as anywhere else. Streets in the area include Dukes Road, Abbey Road and Grieg Road, all of which we cover. Neighbouring places we cover for sand mastic include West Twyford (1 mile north-west), Hanger Hill (1 mile south-west), Stonebridge (1 mile north), Stonebridge Park (1 mile north) and Old Oak Common (1 mile east). Further out, we also cover London (8 miles east), City of Westminster (5 miles east), Marylebone (5 miles east), Kensington (4 miles south-east), St Pancras (7 miles east) and Shoreditch (8 miles east).
Near you in Park Royal
Typical jobs here are in homes near St. Raphael's Edible Garden, Grand Junction Arms and The Ellen Wilkinson School for Girls and the streets around them. Other local landmarks include Library for Iranian Studies (1.5 miles south) and The Ellen Wilkinson School for Girls (1.1 miles south-west). The closest station to Park Royal is Harlesden station, about 0.8 miles north-east. Well-known places in the area include London Designer Outlet (2 miles north) and London Transport Museum Depot (1.7 miles south). For a walk, there’s Castlebar Hill and Kew Gardens Lake.
Surface by surface
Period and listed homes
Period homes look their best with traditional materials, and sand mastic is one of them.
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We can do one window or several.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
What happens if it’s left?
Draughts round a sash window are not always the sashes. Open mastic joints round the box can let air in, and renewing the mastic closes them. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Park Royal, 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, ring 0345 464 0079 or email us for an honest opinion and a quote.
Why choose Mr Mastic in Park Royal
- ARBOMaster approved applicator
- Neat joints and a tidy finish
- Quality sealants from Arbo and Everbuild
- We never seal over old sealant
Take a look at how sealant jobs are priced and our reviews.
What we are called out for in Park Royal
Most of it is simply age. Even well-laid mastic needs renewing in time, depending on exposure and upkeep.
These are the problems we’re asked about most:
- Draughts and rain around sash boxes
- Failed mastic on an exposed elevation
- Cement or filler used on old window joints that has cracked
- Mastic that needs renewing before redecorating
As a London address, Park Royal can be tricky for parking: let us know about parking bays, permits or a driveway.
Questions to ask before you book
- Whether VAT is included
- What the cure time is
- How the colour is chosen
- What guarantee comes with the work