Greater London · England
External & façade joints in Hayes, Greater London
External mastic for Hayes and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Joints pointed up with cement by mistake
- Gaps where render, brick and frames meet
- Moss and dirt in joints with no sealant left
Landlord and commercial work in Hayes
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
For anyone letting property in or around Hayes, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
External mastic for homes and businesses in Hayes
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Porous or awkward surfaces are primed where the sealant needs it, and we don’t skip that step. If you have panel joints letting water in and sealant pulling away from one side of the joint, we can help, on copings & trims, joints between brick and frames and concrete & block alike.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall.
Your job is guaranteed for a year, as with all our work.
- Place
- Hayes (BR4, BR2)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Walls and rooflines in Hayes
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Bromley Palace (about 2 miles north) are a reminder that the area around Hayes has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
For landlords with property near Hayes (Kent) station, split movement joints are easy to miss on a rental until damp shows inside. For site and facilities teams at buildings such as Hawes Down Primary School, larger buildings have long runs of movement joint that eventually need resealing. If you live in an older home near St Mary the Virgin, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Hayes is about 2 miles south of Bromley, in Greater London. Whether you are in the middle of Hayes or further out, external mastic is available for homes and businesses alike. Hayes is one of 764 places in Greater London where we work. London is on our list too, about 10 miles from Hayes.
Postcode districts we cover here for external mastic: BR4 and BR2. We cover properties on Hawes Lane, Crest Road and Keswick Road and the roads around them. Other places close to Hayes include West Wickham (1 mile west), Coney Hall (1 mile west), Bromley Common (1 mile north-east), Nash (1 mile south) and Eden Park (2 miles north-west). We also work in nearby towns such as London (10 miles north-west), City of Westminster (12 miles north-west), Marylebone (12 miles north-west), Kensington (12 miles north-west), St Pancras (12 miles north-west) and Shoreditch (11 miles north).
Landmarks near Hayes
We work in homes and buildings around Coney Hall Recreation Ground, New Inn and Hayes School, among other places. There’s a railway station in Hayes itself: Hayes (Kent) station. Nearby you’ll also find National Psychosis Unit (1.6 miles west) and Bethlem Museum of the Mind (1.1 miles east). For a walk, there’s Summer Hill and Hutchinson's Bank.
DIY versus a professional finish
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
How we quote for external mastic
There’s no set price list. What we look at:
- How much old sealant there is and how hard it is to remove
- Access and height
- How much there is to do
- Whether there’s mould to deal with
A failed joint rarely gets cheaper to fix by waiting. If you’re not sure whether it needs doing, call 0345 464 0079 or email us for an honest opinion and a quote.
Helping us quote
What to tell us when you ask for a quote:
- Where the property is
- Access, such as stairs, a lift or height
- Any previous sealing or DIY work
- The type of property
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. Whenever you’re ready, ring 0345 464 0079 or email us.
Aftercare tips
After the cure time, these simple habits help:
- Leave the joints unpainted unless we have said otherwise
- Do not let climbing plants root in the sealant
- Keep movement joints as flexible joints, not mortar
- Tell anyone working on the walls about the movement joints
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established so early resealing is worth it.
Why deal with it now?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. In a flat in Hayes, 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: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Why Hayes customers choose us
- Anti-fungal sanitary silicone in wet areas
- Arbo and Everbuild products
- Approved under the ARBOMaster scheme
- Full insurance on every job
Take a look at what affects the cost and what customers say.
Different surfaces, different methods
Concrete and blockwork
The face of concrete or block is often dusty, so preparation is key. A primer goes on where the product requires one before sealing.
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. We reseal them with an exterior sealant suited to the material.
Towns and villages near Hayes
Also in Hayes
How it works
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours for a handful of joints, longer for a whole elevation. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Tell us about any water getting in
- Move anything stored near the joints
How to get a quote
Asking for a quote is easy: tell us what needs doing and where and its rough size. A few photos by email make the job easier to understand.
Related advice
Questions from Hayes
Is Hayes in your area for external mastic?
Yes, Hayes is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or email us with a few details of the job.
Do you work for landlords with property near Hayes (Kent) station?
Yes, we work for letting agents and landlords. You can call 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Do you have insurance?
Yes. We are fully insured for domestic and commercial work.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you do not need to watch us work.
Where is Mr Mastic based?
We’re a Crawley-based firm. We work across South East England, London and Scotland.
How long will you be here?
As a guide, most jobs take a few hours for a handful of joints, longer for a whole elevation. Bigger jobs take longer, and we’ll tell you how long to expect.
Why is there a gap in my brick wall?
Walls move with heat, cold and moisture, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We’ll tell you how long to leave the joint.