Greater London · England
External & façade joints in Park Royal, Greater London
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Park Royal and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Weathered mastic that no longer stretches
- Failed seals between different materials
- Weeds or debris growing in open joints
When something else is needed
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Adding movement joints to masonry that has none
- Cracking across the wall rather than at a joint
- Subsidence or other structural problems
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly before you book.
Where we work in Park Royal
- Joints between brick and frames
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
- Façade panels
About our external mastic in Park Royal
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it, and we do not skip that step. If you have joints where the bead has come unstuck and damp patches traced to an open external joint, we can help, whatever the surface.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so a leaking gutter joint or failed wall joint can affect more than one home. In a converted house in Park Royal, it’s worth checking who is responsible for the outside before booking.
Your job is guaranteed for a year, as with all our work.
- Place
- Park Royal (NW10, W3, W5)
- Region
- Greater London
- Cover
- One year on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Check external joints each spring
- Never let anyone fill a movement joint with mortar
- Fix overflowing gutters above sealed joints
- Wash walls gently around the sealant
Look over the joints once a year, ideally after winter. Watch for splits, edges coming away or growth in the joint.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage.
Work for landlords, hotels and businesses
We also work for property managers and facilities teams. Several sites can be quoted together.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
What external mastic looks like in Park Royal
In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Rented homes near Harlesden station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to St Gabriel's Church include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain. As a London address, Park Royal can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Park Royal is about 1 mile south-west of Harlesden, in Greater London. Anywhere in NW10, we can carry out external mastic at your property. Our area takes in 764 places across Greater London, from the larger towns to small villages. You can also see our page for London, roughly 8 miles from Park Royal.
All of NW10, W3 and W5 is covered for external mastic, from the main roads to the quietest streets. If you need external mastic at a property on Dukes Road, Abbey Road and Grieg Road or anywhere close by, we can help. Neighbouring places we cover for external 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). Within a short drive, 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
Locally, jobs take us to homes and businesses close to St. Raphael's Edible Garden, Grand Junction Arms and The Ellen Wilkinson School for Girls. You’ll also find 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 of the centre. Well-known places in the area include London Designer Outlet (2 miles north) and London Transport Museum Depot (1.7 miles south). The countryside around Park Royal includes Castlebar Hill and Kew Gardens Lake.
Your questions about external mastic in Park Royal
Is parking an issue for external mastic in Park Royal?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Can you do external mastic in Park Royal?
Yes, Park Royal is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and tell us what needs doing, and we’ll send you a clear quote.
Can you match the colour of my brickwork?
The sealant colour is picked to suit the wall so the joint blends in. Exterior sealants come in a good range of colours.
Can I do it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Where is Mr Mastic based?
We work from Crawley. We cover Park Royal and the rest of Greater London.
Do you have insurance?
Yes. Full insurance covers our work.
Will you leave a mess?
We keep the work tidy. Nearby surfaces are protected, and we clear up when we’re done.
What happens if it’s left?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That matters on brick, render and concrete, which can be weaker at the face. A stiffer product can damage the joint edge as it fails. In a flat in Park Royal, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why Park Royal clients choose us
- Colour agreed with you before any work starts
- We’re fully insured
- 12-month guarantee on every job
- Any old sealant cut out fully, not covered over
Read what affects the cost or what customers say.
How the job changes by surface
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. We seal the joint with a flexible exterior sealant so neither cracks the other.
Render joints
Render is weaker at the surface than brick, so a sealant that stretches easily protects the edges. We prime where the product needs it.
How it works
The work is kept neat and contained to the area we’re working on. Expect the work to take a few hours to a few days, depending on the length of joint and the access, and we tell you how long to leave it before we go. 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.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
How to prepare
- Mention any leaks or damp you’ve noticed
- Plan for the work area to be out of bounds to pets and children
- Mention any sign-in or site rules at work premises
Getting a quote
Every job is quoted individually, so the first step is telling us about yours. Just call 0345 464 0079 or send us an email with the details.
Related advice
Nearby places to Park Royal
Other services in Park Royal
How we quote for external mastic
Jobs vary more than people expect. What affects the quote:
- The type of sealant required
- Working hours on commercial sites
- The amount of work
- Access and height
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we’ll go through it with you.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- The address or postcode of the job
- What’s wrong with the joints now
- Whether it has been sealed before
- Roughly how big the job is
Need a quote? Please ring 0345 464 0079 or drop us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.