Hertfordshire · England
External Mastic in Essendon
Professional external mastic in and around Essendon, with old sealant always removed completely and a 12-month guarantee.
- Panel joints letting water in
- Joints with sealant missing in places
- Plants rooting in failed movement joints
Work for landlords, hotels and businesses
Failed sealant is one of the commonest items on a check-out report. Several properties can go on one quote.
Landlords and letting agents in Essendon can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
External mastic in Essendon
Short cuts in external joints show up within a season or two. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We take the old material out and do it properly. Typical jobs include joints where the bead has come unstuck and panel joints letting water in, across concrete & block, copings & trims and render & cladding joints.
Older homes in small places like Essendon may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water usually gets in.
Your job is guaranteed for a year, as with all our work.
- Where
- Essendon (AL9)
- Wider area
- Hertfordshire
- Cover
- 12 months on all our work
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Quotes for external mastic in Essendon
There’s no set price list, because no two jobs are the same. What we look at:
- The product the joint needs
- Whether there’s mould to deal with
- Access and height
- The old material and how stubborn it is
Doing several joints on one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. We will give you a clear quote for the lot.
What we need to know
There’s no need for technical detail. It helps if you can tell us:
- If it’s domestic, commercial or a hotel
- Whether it has been sealed before
- What the problem is, such as mould, gaps, leaks or cracking
- The rough size of the job
We quote each job on its own. Just call 0345 464 0079 or send us an email with the details and send photos if you have them.
The process
Before we leave, we go over the finished joints with you and tell you how long to leave it. The visit itself generally takes anything from a few hours to several days, depending on the building, depending on the size of the job. In a small place like Essendon, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by walking round the building and agreeing the joints and the access.
- 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
- For indoor joints, keep the area dry beforehand if you can
- Tell us if parking is tricky
- For business premises, tell us about site rules or sign-in
Get a quote
There’s no standard price list. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or send us an email.
Advice
Nearby places to Essendon
Other services in Essendon
Essendon: your questions answered
Do you work for landlords with property near Bayford station?
Yes, we work for landlords and agents. You can call 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Will you come out to Essendon?
Yes, Essendon is covered. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
Do you have insurance?
Yes. We are fully insured, and we can confirm the details when we quote.
Is it messy?
We keep the work tidy. We protect what’s around the joints.
Is it OK to fill a movement joint with cement?
No. A mortar-filled joint can’t move, so the wall cracks somewhere else instead. Use a flexible sealant with backing rod.
What sealant do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We’ll tell you what we are using and why.
How long before the joint can be used?
That depends on the sealant used, so follow the cure time we give you.
What sealant work can’t fix
Sealant is not the answer to every problem, and we’d rather say so up front. Sealant will not put right:
- Cracking across the wall rather than at a joint
- Adding movement joints to masonry that has none
- Damp that isn’t coming from the joint
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before booking.
Surfaces we seal
- Joints between brick and frames
- Concrete & block
- Copings & trims
- Façade panels
- Render & cladding joints
- Brickwork movement joints
Leave it or put it right?
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and doesn’t last so it’s worth doing right. In a small place like Essendon, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
The cost depends on the size of the job, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts, so you know where you stand.
Why book with us
- Anti-fungal silicone where joints get wet
- We leave the area clean and tidy
- A choice of colours where the product allows
- Colour picked to suit the job
Read our cost guide and what customers say.
Essendon buildings and the weather
With historic houses such as Hatfield House (about 2.4 miles west) nearby, there’s older building stock in the area around Essendon as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Bayford station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets. Schools such as Essendon CofE (VC) Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Essendon is about 3 miles south-east of Welwyn Garden City, in Hertfordshire. If you need external mastic in Essendon, it’s easy to get a quote: please call 0345 464 0079 or email us. We’re based in Crawley and cover Hertfordshire, Essendon included. Our Hertfordshire coverage runs to 381 places, and Essendon is one of them. For nearby work, see our London page (18 miles or so).
Jobs for external mastic in AL9 is quoted and booked the same way as anywhere else. Whether your property is on Rectory Close, Church Street and School Lane or anywhere close by, we can help. Other places close to Essendon include West End (1 mile west), Little Berkhamsted (1 mile south-east), Letty Green (2 miles north-east), East End Green (2 miles north-east) and Bayford (2 miles east). We also work in nearby towns such as Watford (13 miles south-west), Hemel Hempstead (13 miles west), Stevenage (10 miles north), St Albans (8 miles west), Bishop's Stortford (15 miles north-east) and Welwyn Garden City (3 miles north-west).
Around Essendon
We work in homes and buildings around The Salisbury Crest Public House. For rail, the closest station is Bayford station, roughly 2.5 miles east of the centre. Other landmarks nearby include Queen Elizabeth II Hospital (2 miles north-west) and The Bunker at Hatfield Police Station (3.6 miles west). Open spaces near Essendon include Willowmead.
When to call us in Essendon
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, 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:
- Damp patches traced to an open external joint
- Plants rooting in failed movement joints
- Sealant that has lost its bond to the brick or render
- Rigid filler in a joint that should flex
Homes close to Church of St Mary the Virgin include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
What to look for in a quote
- What product goes in the joint
- How hidden problems are handled
- Is the old sealant removed completely?
- Whether VAT is included
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.