Hampshire · England
External & façade joints in Botley, Hampshire
External mastic for Botley, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Weathered mastic that no longer stretches
- Joints where the bead has come unstuck
- Moss and dirt in joints with no sealant left
Why it’s worth doing now in Botley
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner so it’s worth doing right. In a smaller place like Botley, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why Botley customers choose us
- White, clear, grey or another colour, product permitting
- A 12-month guarantee on all work
- Neat joints and a tidy finish
- Homes, businesses and hotels
See our cost guide or what customers say.
About our external mastic in Botley
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. We pick a colour that sits well with the wall so the joint does not stand out. We work on render & cladding joints, brickwork movement joints and copings & trims, and the jobs we see most are sealant pulling away from one side of the joint and movement joints with cracked, split or missing sealant.
Around Botley, garages, outbuildings and extensions all add to the joints on the outside of a home. Leaks usually start at a gutter end, a garage door frame or where an extension meets the house.
A 12-month guarantee comes as standard, so you are covered after we have gone.
- Place
- Botley (SO30)
- Region
- Hampshire
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Surface by surface
Copings and trims
Metal and stone copings both move with temperature, so a flexible sealant suits them best.
Render joints
Rendered walls have joints at beads, openings and changes of material. We reseal them with a flexible exterior sealant that suits the render colour.
How it works
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take a few hours to a few days, depending on the length of joint and the access. In a smaller place like Botley, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Before we arrive
- On commercial sites, let us know about site rules
- Mention any parking rules near the property
- Keep pets and children clear of the area while we work
Ask for a quote
For external mastic in Botley, phone 0345 464 0079 or email us. Tell us what the problem is and where, and you’ll get a clear quote before we start.
Read more
Places near Botley
Other services in Botley
Botley: your questions answered
Can you do external mastic in Botley?
Yes, Botley is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear price.
I let a flat near Botley station. Can you help?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or email us with the details for a clear quote.
What sealant do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover Botley.
What’s an expansion joint in brickwork?
It’s a deliberate gap that lets the wall expand and contract without cracking. It should be filled with flexible sealant, never mortar.
Do you have insurance?
Yes. We’re fully insured.
How do I get a quote for external mastic in Botley?
It depends on the job, so we quote each one individually. To get one, ring 0345 464 0079 or email us and let us know what needs doing and where.
What is backing rod for?
Backing rod goes into deeper joints as a matter of course. It controls the depth and stops the sealant bonding to the back, so the joint can move.
Botley buildings and the weather
Historic houses like South Stoneham House (about 4.6 miles west) are a reminder that the area around Botley has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. 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.
If you let a flat or house near Botley station, outside joints that have cracked can let damp into a rental, so check them between lets. Homes close to Church of All Saints include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Botley is about 1 mile east of Hedge End, in Hampshire. Botley gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. We cover 683 towns and villages across Hampshire, large and small.
Our applicators cover all of the SO30 postcode area for external mastic. We cover properties on High Street, Boswell Close and Bailey Close. With the A334 close by, Botley is easy for our applicators to reach. Other places close to Botley include Boorley Green (1 mile north), Curdridge (2 miles east), Curbridge (2 miles south-east), Durley (2 miles north) and Horton Heath (3 miles north). Further out, we also cover Winchester (10 miles north), Gosport (9 miles south-east), Havant (13 miles east), Eastleigh (5 miles north-west), Fareham (6 miles south-east) and Horndean (12 miles east).
Local landmarks in Botley
Locally, jobs take us to homes and businesses close to Wildern School, Wildern School and The Dolphin Hotel The Dolphin Public House and the streets around them. The nearest railway station is Botley station, about 0.8 miles east. Nearby you’ll also find Moorgreen Hospital (2.2 miles north-west) and Netley Castle (4.4 miles south-west). For a walk, there’s Swanwick Lakes.
Common problems we fix in Botley
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall and make things worse.
Common reasons people contact us include:
- Hard, crazed mastic that has stopped moving
- Leaking joints around cladding and façade panels
- Movement joints filled with mortar instead of sealant
- Movement joints with cracked, split or missing sealant
If you look after a building such as Botley Church of England Controlled Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
What your quote should include
- Whether all the old sealant comes out first
- How much experience the applicator has
- How hidden problems are handled
- Is VAT in the price?
Keeping the joints in good condition
So the new joints stay in good condition:
- Wash walls gently around the sealant
- Look over the joints every year, ideally after winter
- Fix overflowing gutters above sealed joints
- Never let anyone fill a movement joint with mortar
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established so early resealing is worth it.
Quotes for external mastic in Botley
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Whether the work is at height
- Which sealant suits the joint
- The number of rooms or windows
- Whether old sealant or filler has to be cut out
A failed joint rarely gets cheaper to fix by waiting. If you’re not sure whether it needs doing, ring 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Asking for a quote
When you call or email, these details help:
- Where the job is, and your postcode
- Photos by email, if that is easy
- Any access issues, like height or stairs
- Whether it has been sealed before
We quote each job on its own. Just ring 0345 464 0079 or email us with the details, and photos are welcome.
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.