Hampshire · England
External & façade joints in Crawley, Hampshire
External mastic across Crawley and nearby, with old sealant always removed completely and a 12-month guarantee.
- Failed seals between different materials
- Moss and dirt in joints with no sealant left
- Panel joints letting water in
External mastic in Crawley, done properly
Low-level joints can usually be done from the ground. For joints higher up, give us some details of the building and we’ll confirm what access is needed. If you have panel joints letting water in and plants rooting in failed movement joints, we can help.
In a village or hamlet like Crawley, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
A 12-month guarantee comes as standard.
- Where
- Crawley (SO21)
- Region
- Hampshire
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
When it is not the sealant
Before you book, it’s worth knowing the limits:
- Damp that isn’t coming from the joint
- Cracked brickwork or render that needs a builder or plasterer
- Failed render or damaged cladding panels
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think before you book.
Surfaces we seal
- Façade panels
- Render & cladding joints
- Concrete & block
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
Towns and villages near Crawley
More services for Crawley
Keeping the joints in good condition
How long the joints last depends on use and care. Here’s what we suggest:
- Show decorators and builders where the movement joints are
- Leave the joints unpainted unless we have said otherwise
- Clear growth from the base of walls and joints
- Make sure movement joints aren’t pointed over
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
Once a joint can’t move, the wall finds another way, often as cracks near the joint. Resealing it early helps prevent that.
Outside joints around Crawley
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For an older house near a landmark such as Church of St Mary, an extension built onto an older house moves differently, and the joint between them takes the strain. If you let a flat or house near Winchester station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Crawley is about 5 miles north-west of Winchester, in Hampshire. Jobs in Crawley get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Our Hampshire coverage runs to 683 places, and Crawley is one of them. Our Southampton page covers work nearby (13 miles or so).
Postcode districts we cover here for external mastic: SO21. Close by, we work in Worthy Down (3 miles east), South Wonston (3 miles east), Sutton Scotney (4 miles north-east), Barton Stacey (4 miles north) and Springvale (4 miles east). Larger places within reach include Winchester (5 miles south-east), Eastleigh (10 miles south), Andover (8 miles north-west), Totton (14 miles south), Chandler's Ford (9 miles south) and Hedge End (14 miles south).
What’s near Crawley
Typical jobs here are in homes near Fox And Hounds Public House, among other places. The closest station to Crawley is Winchester station, roughly 4.5 miles south-east of the centre. Well-known places in the area include Winchester Castle (4.8 miles south-east) and Royal Hampshire County Hospital (4.5 miles south-east). Not far away are Winnall Moors.
How it works
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes anything from a few hours to several days, depending on the building and we leave things clean and tidy. For a village or hamlet like Crawley, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
- 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
- Tell us about access, such as stairs, a lift or high-level joints
- Keep children and pets away from the work area
- On commercial sites, let us know about site rules
Ask for a quote
There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or send us an email.
Read more
What affects the cost of external mastic
Every job gets its own quote. This is what makes a difference:
- Whether the work is at height
- How many rooms, windows or areas are involved
- Any mould that needs treating
- Which sealant suits the joint
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Helping us quote
What to tell us when you ask for a quote:
- What the problem is, such as mould, gaps, leaks or cracking
- Pictures of the joints, sent by email
- How we’d reach the joints
- Any previous sealing or DIY work
Want a quote for external mastic? Please ring 0345 464 0079 or drop us an email and tell us about the job. We will explain what we’d do and give you a clear price before any work starts.
Surface by surface
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so its sealant has to stay flexible.
Cladding and façade panels
Panels heat up and cool down quickly, so the joint sealant has to cope with frequent movement. The sealant is chosen with that in mind.
Common questions in Crawley
Can you do external mastic in Crawley?
Yes, Crawley is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or email us with a few details of the job.
Do you cover smaller places like Crawley?
Yes, Crawley is covered. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Crawley.
Do I have to be there?
It depends on the job. Inside work needs someone to give us access.
How long does external mastic take?
It depends on the size of the job, but as a guide it takes a few hours for a handful of joints, longer for a whole elevation. We will tell you when we quote.
When will the joints need doing again?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year and renew it when it starts to fail.
What is a movement joint?
Walls move with heat, cold and moisture, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
What information do you need?
A short description and the location. We’ll ask anything else we need to know.
Leave it or put it right?
Mortar or ordinary filler might look like a quick way to close an open joint, but it locks the joint solid. The wall then cracks somewhere else. A flexible sealant over backing rod is what the joint needs. Older cottages and farmhouses around Crawley can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
What it costs depends on the size of the job, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
Why us?
- 4.9 on Google from 180+ five-star reviews
- Colour agreed with you before work begins
- White, clear, grey or coloured to suit, where the product allows
- Approved under the ARBOMaster scheme
Take a look at what affects the cost or what customers say.
For landlords and businesses
Housing providers, facilities teams and property managers book us too in Crawley and across Hampshire. Several sites can be quoted together, and we are fully insured for the work.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.