West Sussex · England
Itchingfield External Mastic
External mastic in Itchingfield from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Joints with sealant missing in places
- Joints where the bead has come unstuck
- Gaps where render, brick and frames meet
External mastic for homes and businesses in Itchingfield
Joints in render and cladding are easy to overlook until a damp patch appears. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a colour to suit. We work on concrete & block, façade panels and render & cladding joints, and the jobs we see most are panel joints letting water in and failed seals between different materials.
Outside joints can only be sealed when they’re dry, so work in Itchingfield is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
Your job is guaranteed for a year, as with all our work.
- Place
- Itchingfield (RH13)
- Region
- West Sussex
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
When it isn’t the sealant
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- Subsidence or other structural problems
- Cracked brickwork or render that needs a builder or plasterer
- Loose or hollow render, which needs re-rendering
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer before booking.
Where we work in Itchingfield
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
- Façade panels
- Joints between brick and frames
- Copings & trims
Common questions in Itchingfield
I let a flat near Christs Hospital station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
Can you do external mastic in Itchingfield?
Yes, Itchingfield is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Is it OK to fill a movement joint with cement?
No. Mortar locks the joint solid, so the movement cracks the wall elsewhere. Use a flexible sealant with backing rod.
How long does external mastic take?
As a guide, most jobs take anything from a few hours to several days, depending on the building. Bigger jobs take longer, and we will say how long yours will take.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
Can you seal joints between two different materials?
Yes. Different materials move at different rates, so a flexible sealant is needed where they meet. We choose one that suits both surfaces.
What’s an expansion joint in brickwork?
Most straight vertical gaps in brickwork are movement joints. It lets the bricks expand without cracking and needs a flexible seal, not mortar.
What happens on the day
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours to a few days, depending on the length of joint and the access. Somewhere as small as Itchingfield, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by walking round the building and agreeing the joints and the access.
- 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.
- We apply the sealant, tool it and check the whole run.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know about earlier repairs to the joints
Getting a quote
Getting a quote is simple: let us know what needs doing and where. Photos by email help us understand the job, and we’ll take it from there.
Read more
Itchingfield buildings and the weather
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as The Parish Church of St Nicolas, the joints between older walls, newer extensions and the roofline need a sealant that can move. For site and facilities teams at buildings such as Barns Green Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Itchingfield is about 4 miles west of Horsham, in West Sussex. Homes, rented property, offices and hotels in Itchingfield is covered for external mastic. Every job comes with our 12-month guarantee. Across West Sussex, we cover 371 places, and Itchingfield is one of them. For nearby work, see our Crawley page.
Postcode districts we cover here for external mastic: RH13. Local streets include Bashurst Hill, Five Oaks Road and Bashurst Copse, all of which we cover. Neighbouring places we cover for external mastic include Barns Green (1 mile south), Broadbridge Heath (2 miles north-east), Brooks Green (2 miles south), Tower Hill (2 miles east) and Southwater (3 miles south-east). Within a short drive, we also cover Crawley (10 miles north-east), Horsham (4 miles east), Haywards Heath (14 miles east), Burgess Hill (13 miles south-east), Broadfield (9 miles east) and Storrington (9 miles south).
Landmarks near Itchingfield
In Itchingfield, that means homes and buildings near Tanbridge House School, among other places. The closest station to Itchingfield is Christs Hospital station, about 1.5 miles east. Other landmarks nearby include Christs Hospital School Museum (1.6 miles east) and Horsham Hospital (3.5 miles north-east). Green spaces nearby include Warnham LNR.
What affects the cost of external mastic
The quote reflects the job in front of us. We take into account:
- The type of sealant required
- The size of the job
- The old material and how stubborn it is
- Any working-time requirements on site
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or send us an email.
What to tell us for a quote
Photos help, but a description is a good start. Please mention:
- Where the property is
- The rough size of the job
- Any previous sealing or DIY work
- The problem you’ve noticed
To get a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We will send you a clear quote before any work starts.
DIY sealant or a professional job?
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, and the work is guaranteed for a year.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
How the job changes by surface
Render joints
Render is weaker at the surface than brick, so a low-modulus sealant is kinder to the joint edges. Priming is done where the sealant calls for it.
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best in all weathers.
How to look after the new joints
To keep the joints looking good and working properly:
- Get split or bare joints resealed while the damage is small
- Deal with leaking gutters that soak the joints below
- Show decorators and builders where the movement joints are
- Look over the joints every year, ideally after winter
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established.
Common problems we fix in Itchingfield
Every building moves. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
Look out for these signs:
- Plants rooting in failed movement joints
- Leaking joints around cladding and façade panels
- Old sealant gone brittle and cracked
- Sealant pulling away from one side of the joint
For landlords with property near Christs Hospital station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Before you book anyone
- What the quote includes, VAT included or not
- Whether the sealant suits the joint
- When the joint can take water or movement
- Who turns up on the day