West Sussex · England
Codmore Hill External Mastic
Sealing brickwork movement joints, render, cladding and façade joints in Codmore Hill, with a one-year guarantee on every job. Ask us for a quote.
- Water getting into walls through failed joints
- Brick movement joints where the sealant has split
- Rigid filler in a joint that should flex
What happens if it’s left?
Resealing a run of joints in one go is generally better than patching one at a time. They’ve weathered the same way. Where a wall is exposed, as many are in small places like Codmore Hill, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, ring 0345 464 0079 or email us for an honest opinion and a quote.
Why us?
- Every job guaranteed for a year
- Colour picked to suit the job
- 4.9 on Google from 180+ five-star reviews
- Anti-fungal silicone where joints get wet
See our cost guide and customer reviews.
External mastic in Codmore Hill, done properly
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, and when it fails, the wall takes the strain and water finds a way in. We work on joints between brick and frames, façade panels and concrete & block, and the jobs we see most are sealant pulling away from one side of the joint and weathered mastic that no longer stretches.
Somewhere as small as Codmore Hill, 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’re covered for a year from the day we finish. If anything is not right with it, phone 0345 464 0079 or send us an email.
- Where
- Codmore Hill (RH20)
- Wider area
- West Sussex
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How we quote for external mastic
Every job gets its own quote. These are the things that affect it:
- The type of sealant required
- Mould in or behind the old joints
- The number of rooms or windows
- Whether the work is at height
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You’ll have a clear quote before any work starts, so you know where you stand.
Asking for a quote
When you call or email, these details help:
- A few pictures by email, if you can
- The type of property
- The problem you’ve noticed
- How many joints, rooms or windows are involved
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’ll explain what’s involved before giving you a price.
How the visit works
Once we’re 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 anything from a few hours to several days, depending on the building. Somewhere like Codmore Hill needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip 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.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Tell us if parking is tricky
- Mention if the joints have been sealed before
- For business premises, tell us about site rules or sign-in
Ask for a quote
Asking for a quote is easy: tell us what needs doing and where and its rough size. A few pictures by email make the job easier to understand, and we’ll take it from there.
Read more
Your questions about external mastic in Codmore Hill
Will you come out to Codmore Hill?
Yes. Codmore Hill is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
I let a flat near Pulborough station. Can you help?
Yes, we work for landlords and agents. You can call 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before any work starts.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Are you fully insured?
Yes. We’re fully insured for domestic and commercial work.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned before resealing.
What’s an expansion joint in brickwork?
Walls move with heat, cold and moisture, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
How do you reach high-level joints?
That depends on the building and the joints. We work on joints that can be reached safely. Give us some details and we’ll confirm the access.
What colours does the sealant come in?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best so it doesn’t stand out.
Nearby places to Codmore Hill
Other services in Codmore Hill
When something else is needed
It helps to know what we cannot do too:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Adding movement joints to masonry that has none
- Failed render or damaged cladding panels
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Façade panels
- Brickwork movement joints
- Concrete & block
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
Codmore Hill buildings and the weather
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Old Place Manor (about 1 mile south-west) nearby, there’s older building stock in the area around Codmore Hill as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
If you look after a building such as St Mary's Church of England Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For an older house near a landmark such as The Parish Church of St Mary, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Codmore Hill is about 10 miles south-west of Horsham, in West Sussex. Whether you’re in the middle of Codmore Hill or further out, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Our West Sussex coverage runs to 371 places, and Codmore Hill is one of them. Crawley is on our list too, about 17 miles from Codmore Hill.
Every address in RH20 is covered for external mastic, from the main roads to the quietest streets. Whether your property is on Masons Way, Hill Farm Lane and Stane Street or anywhere close by, we can help. Nearby, we also carry out external mastic in Broomershill (1 mile south-east), North Heath (1 mile north-east), Nutbourne (1 mile south-east), Marehill (1 mile south-east) and Gay Street (2 miles east). Within a short drive, we also cover Horsham (10 miles north-east), Worthing (11 miles south-east), Bognor Regis (15 miles south-west), Chichester (15 miles south-west), Littlehampton (11 miles south) and Shoreham-by-Sea (14 miles south-east).
What’s near Codmore Hill
The nearest railway station is Pulborough station, roughly 1.2 miles south-west of the centre. A little further out are Coates Castle (4.2 miles west). The countryside around Codmore Hill includes The Mens.
What we’re called out for in Codmore Hill
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it cannot stretch and rips as the joint opens.
Look out for these signs:
- Rain getting behind render or cladding at a joint
- Failed seals between different materials
- Joints pointed up with cement by mistake
- Joints where the bead has come unstuck
Letting a property close to Pulborough station? Then split movement joints are easy to miss on a rental until damp shows inside.
Questions to ask before booking
- Whether they seal over old material or remove it
- Whether VAT is included
- Whether you can choose the colour
- How much experience the applicator has
How to look after the new joints
To keep the joints looking good and working properly:
- Keep soil, plants and ivy away from the joints
- Get split or bare joints resealed while the damage is small
- Make sure movement joints aren’t pointed over
- Look over the joints every year, ideally after winter
Only paint over the joint if we have confirmed the sealant can take paint. Many exterior sealants are not designed to be painted.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established, so it’s worth resealing at the first signs.
How the job changes by surface
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible in all weathers.
Joints between dissimilar materials
Different materials may need different primers. We prepare both faces so the sealant bonds properly.