Essex · England
External Mastic in High Ongar
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in High Ongar and across Essex. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Movement joints filled with mortar instead of sealant
- Moss and dirt in joints with no sealant left
- Gaps where render, brick and frames meet
External mastic for homes and businesses in High Ongar
For buildings in High Ongar, we reseal external joints of all kinds, from brick movement joints to cladding panels. The preparation is the same whatever the wall: clean, sound faces and a controlled depth. Typical jobs include moss and dirt in joints with no sealant left and old sealant gone brittle and cracked, across façade panels, render & cladding joints and brickwork movement joints.
Somewhere as small as High Ongar, homes and farm buildings often face open ground, so walls and rooflines take the full force of wind and rain. Joints on those walls need a sealant that moves with the building and stays in place.
You get a one-year guarantee, the same in High Ongar as everywhere else we work.
- Place
- High Ongar (CM5)
- Wider area
- Essex
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Landlords, agents and businesses in High Ongar
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.
We also work for property managers and facilities teams in High Ongar and across Essex. Several sites can go on one quote, and we’re fully insured for the work.
Why it’s worth doing now in High Ongar
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost around the joint, so the problem grows beyond the joint itself. Around High Ongar, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Leaving a failed joint usually makes the job bigger, not smaller, because water and mould keep working on it. If you’re unsure, phone 0345 464 0079 or send us an email for an honest opinion and a quote.
What you get with us
- Colour picked to suit the job
- Anti-fungal silicone where joints get wet
- A choice of colours where the product allows
- Domestic, commercial and hotel work
Take a look at what affects the cost or customer reviews.
High Ongar: your questions answered
Can you do external mastic in High Ongar?
Yes, High Ongar is within the area we cover. We work across 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.
What guarantee comes with external mastic in High Ongar?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Do you work for landlords and businesses?
Yes. As well as homeowners, we work for landlords, agents, businesses and hotels.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Is it OK to fill a movement joint with cement?
No. Mortar locks the joint solid, so the wall cracks somewhere else instead. It needs a flexible sealant over backing rod.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Where are you based?
Our base is Crawley. We work across South East England, London and Scotland.
How long does the job take?
That depends on the amount of work, but most jobs take a few hours to a few days, depending on the length of joint and the access. We’ll tell you when we quote.
How we quote for external mastic
The price is agreed before any work begins. It’s based on:
- The product the joint needs
- When we can work, for business premises
- How easy the joints are to reach
- The number of rooms or windows
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- The problem you’ve noticed
- The type of property
- The address or postcode of the job
- Access, such as stairs, a lift or height
We quote each job on its own. Just ring 0345 464 0079 or drop us an email with the details, and pictures are welcome.
When to call us in High Ongar
UV, rain and frost all age exterior sealant. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
If you can see any of these, it’s time to have the joints looked at:
- Movement joints with cracked, split or missing sealant
- Gaps where render, brick and frames meet
- Rigid filler in a joint that should flex
- Panel joints letting water in
For site and facilities teams at buildings such as High Ongar Primary School, larger buildings have long runs of movement joint that eventually need resealing.
What to look for in a quote
- Whether all the old sealant comes out first
- Which colour the sealant will be
- Whether the sealant suits the joint
- How much experience the applicator has
What the job involves on each 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.
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. That movement goes into the joint, so the sealant in it must stay soft and stretchy.
Places near High Ongar
What else we do in High Ongar
High Ongar buildings and the weather
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In the older streets around Church of St Mary the Virgin, older walls, gutters and the joints where extensions meet them need a flexible sealant.
High Ongar is about 6 miles north of Brentwood, in Essex. If you need external mastic in High Ongar, it’s easy to get a quote: please ring 0345 464 0079 or email us. We cover Essex from our Crawley base, High Ongar included. Our area takes in 644 places across Essex, large and small. We also work in Chelmsford, around 10 miles away.
We work across the CM5 postcode area for external mastic. That includes homes and businesses on The Street, Mill Lane and Millfield. If you are just outside High Ongar, we cover Chipping Ongar (1 mile west), Shelley (1 mile north-west), Norton Mandeville (1 mile north-east), King Street (1 mile east) and Greensted (2 miles west). We also work in nearby towns such as Chelmsford (10 miles east), Basildon (12 miles south-east), Harlow (8 miles north-west), Brentwood (6 miles south), Billericay (9 miles south-east) and Loughton (9 miles south-west).
Local landmarks in High Ongar
In High Ongar, that means homes and buildings near Red Lion Public House and The Ongar Academy. Other landmarks nearby include Willingale Doe (3.7 miles north-east).
What sealant work cannot fix
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Movement that is more than a sealant joint can take
- Rising or penetrating damp from elsewhere in the wall
- Cracks in the bricks or render themselves, away from the joints
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think before you book.
Where we work in High Ongar
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Façade panels
- Brickwork movement joints
- Concrete & block
What happens on the day
Once we are on site, we compare the joints with what we discussed. 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. Somewhere like High Ongar needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Let us know if you’ve seen damp or leaks
- On commercial sites, let us know about site rules
- Let us know about stairs, lifts or work at height
Getting a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. When it suits you, call 0345 464 0079 or email us.