Buckinghamshire · England
External & façade joints in Chesham, Buckinghamshire
Professional external mastic in and around Chesham, with old sealant always removed completely.
- Moss and dirt in joints with no sealant left
- Failed seals between different materials
- Brick movement joints where the sealant has split
How we handle external mastic in Chesham
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we’ll confirm what access is needed. Common call-outs are for sealant that has lost its bond to the brick or render and brick movement joints where the sealant has split, across façade panels, concrete & block and copings & trims.
Extensions are a common sight on houses around Chesham, and the line where an extension meets the original house is a common leak point. Getting the joint depth right matters as much as the sealant itself.
Big or small, it’s backed by our 12-month guarantee.
- Where
- Chesham (HP5)
- Wider area
- Buckinghamshire
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What the job involves on each surface
Cladding and façade panels
If the façade has a specified sealant, that’s what we use, or one the system allows. Tell us what the building has when you get in touch.
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
Why it’s worth doing now in Chesham
Done well, a resealed joint is a neat, straight line that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner so it’s worth doing right. Around Chesham, failed sealant lets water into hidden places, such as under the floor, behind a panel or into a wall. Whatever the joint, failed sealant only gets worse.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Why us?
- We leave the area clean and tidy
- Anti-fungal sanitary silicone in wet areas
- 4.9 on Google from 180+ five-star reviews
- Quality sealants from Arbo and Everbuild
See what affects the cost and our reviews.
How to look after the new joints
To keep the joints looking good and working properly:
- Act on the first splits you see
- Check the sealant is paintable before painting near it
- Fix overflowing gutters above sealed joints
- Keep movement joints as flexible joints, not mortar
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead and let water in behind.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick, all bigger jobs than a reseal.
External mastic in Chesham: local notes
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. Historic houses like Cholesbury Manor House (about 3.5 miles north-west) are a reminder that the area around Chesham has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Rented homes near Amersham station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. If you look after a building such as Elmtree Infant and Nursery School, its movement joints, gutters and trims need looking after like any other building’s.
Chesham is about 7 miles south-west of Hemel Hempstead, in Buckinghamshire. For external mastic in and around Chesham, it’s easy to get a quote: please ring 0345 464 0079 or drop us an email. We cover Buckinghamshire from our Crawley base, Chesham included. Chesham is one of 263 towns and villages in Buckinghamshire we cover. There’s also a page for Reading, roughly 24 miles from Chesham.
Every address in HP5 is covered for external mastic, from the main roads to the quietest streets. We cover properties on High Street, Station Road and Sunnyside Road and the roads around them. With the A416 and B485 close by, Chesham is easy for our applicators to reach. Nearby, we also carry out external mastic in Pond Park (1 mile north), Chartridge (2 miles north-west), Hundridge (2 miles west), Asheridge (2 miles north-west) and Bellingdon (2 miles north-west). Further out, we also cover Aylesbury (11 miles north-west), High Wycombe (8 miles south-west), Marlow (12 miles south-west), Amersham (3 miles south), Beaconsfield (7 miles south) and Chalfont St Peter (8 miles south). Chesham is among the bigger towns we cover in Buckinghamshire.
Local landmarks in Chesham
Typical jobs here are in homes near Chiltern Hills Academy and The Jolly Sportsman pub, among other places. The nearest railway station is Amersham station, about 2.6 miles south. Nearby you will also find Amersham Hospital (3.4 miles south) and Hawridge Court (2.2 miles north). Green spaces nearby include Sands Bank.
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
Common questions in Chesham
Do you work for landlords with property near Amersham station?
Yes. We work for letting agents and landlords as well as householders, and several properties can go on one quote. Just call 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear price.
What guarantee comes with external mastic in Chesham?
Every job comes with our 12-month guarantee, wherever it is. We’re fully insured, and an ARBOMaster approved applicator.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Can new sealant go over the old?
No. The old sealant always comes out first.
What should I tell you?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply ring 0345 464 0079 or drop us an email.
Can you seal joints between two different materials?
Yes. Materials like render, brick, metal and uPVC all move differently, so the joint between them must be flexible. The sealant is matched to both sides.
How much does external mastic cost in Chesham?
Every job is different, so each one gets its own quote. To get one, call 0345 464 0079 or email us and let us know what needs doing and where.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
How the visit works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, do the work and clear up. It generally takes anything from a few hours to several days, depending on the building. A visit in Chesham needs access to the work and a place to park close by. If the job is outside, mention gates, side access and anything above ground floor.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Keep children and pets away from the work area
- For indoor joints, keep the area dry beforehand if you can
- Let us know about parking restrictions
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved and give you a clear quote.
Advice
Places near Chesham
More services for Chesham
For landlords and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
Landlords and letting agents in Chesham can book us as well as householders. Sealant work between tenants keeps a property looking cared for.
Signs you need external mastic in Chesham
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
If you can see any of these, it’s time to have the joints looked at:
- Gaps where render, brick and frames meet
- Joints pointed up with cement by mistake
- Old sealant gone brittle and cracked
- Brick movement joints where the sealant has split
Cholesbury Manor House, about 3.5 miles north-west, is one of the historic houses in the wider area around Chesham, and older homes nearby need a sealant that suits their walls.
Comparing quotes
- Which colour the sealant will be
- Is the old sealant removed completely?
- Which sealant they’ll use, and why
- Are they insured?