Southampton · England
External & façade joints in Chartwell Green, Southampton
External mastic for Chartwell Green, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Hard, crazed mastic that has stopped moving
- Panel joints letting water in
- Joints pointed up with cement by mistake
External mastic in Chartwell Green, done properly
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we will confirm what access is needed. We work on façade panels, copings & trims and brickwork movement joints, and the jobs we see most are rigid filler in a joint that should flex and panel joints letting water in.
Outbuildings, garages and conservatories around homes in places like Chartwell Green add more joints to look after. Gutter ends, garage door frames and the joints where an extension meets the house are typical spots for leaks.
There’s a 12-month guarantee on every job, whatever its size.
- Location
- Chartwell Green (SO18, SO30)
- Region
- Southampton
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Aftercare tips
How long the joints last depends on use and care. We suggest:
- Keep movement joints as flexible joints, not mortar
- Keep soil, plants and ivy away from the joints
- Check external joints each spring
- Keep water from gutters off the wall
Only paint over the joint if we have confirmed the sealant can take paint. Many exterior sealants are not designed to be painted, and paint can crack as the joint moves.
Once a joint cannot move, the wall finds another way, often as cracks near the joint. Resealing it early helps prevent that.
What sealant work cannot fix
Sealant is not the answer to every problem, and we’d rather say so up front. It will not solve:
- Structural movement, which needs a surveyor or engineer
- Walls that need new movement joints cut into them
- Damp that is not coming from the joint
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think before you book.
Joints and surfaces we work on
- Joints between brick and frames
- Façade panels
- Brickwork movement joints
- Copings & trims
- Concrete & block
- Render & cladding joints
Nearby places to Chartwell Green
What else we do in Chartwell Green
For landlords and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
What happens on the day
On the day, we start by going over the job with you, so you know exactly what we are doing. We protect the surfaces around the joints before any work begins. Most jobs take a few hours to a few days, depending on the length of joint and the access. For a job in Chartwell Green, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- 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.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Mention if the joints have been sealed before
- Let us know if you’ve seen damp or leaks
- Let us know about stairs, lifts or work at height
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. When it suits you, ring 0345 464 0079 or send us an email.
Advice
What affects the cost of external mastic
The quote reflects the job in front of us. We look at:
- Access and height
- How much there is to do
- Which sealant suits the joint
- Whether old sealant or filler has to be cut out
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first and agree the price before starting.
Helping us quote
To make quoting easier, please include:
- The type of property
- Whether it has been sealed before
- The address or postcode of the job
- The rough size of the job
Asking for a quote is easy: let us know the job and the location. Photos by email help us understand the job, and we will take it from there.
External mastic in Chartwell Green: local notes
The South East is one of the drier parts 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 South Stoneham House (about 1.3 miles west) nearby, there’s older building stock in the area around Chartwell Green as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Managing a site like Townhill Infant School? Then its movement joints, gutters and trims need looking after like any other building’s. Letting a property close to Swaythling station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies. In the older streets around Church of St James, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Chartwell Green is about 2 miles north-east of Southampton, in Southampton. Anywhere in SO18, we cover external mastic for homes and businesses. Chartwell Green is one of 40 places in Southampton where we work.
Work in SO18 and SO30 works the same way as everywhere else we cover. If you need external mastic at a property on Ivy Lane, Arun Road and Eden Road or a nearby road, our applicators can take on the job. Neighbouring places we cover for external mastic include Townhill Park (1 mile west), West End (1 mile east), Midanbury (1 mile south-west), Mansbridge (1 mile north-west) and Harefield (1 mile south). Within a short drive, we also cover Shirley (4 miles west), Regents Park (4 miles west), Maybush (4 miles west), Woolston (3 miles south-west), Coxford (4 miles west) and Freemantle (4 miles west). Being one of Southampton’s larger places, Chartwell Green has homes, rented property and businesses of every kind.
Near you in Chartwell Green
In Chartwell Green, that means homes and buildings near Itchen Valley Country Park, Bitterne Park School and The Gregg School and the streets around them. For rail, the closest station is Swaythling station, roughly 1.4 miles north-west of the centre. Well-known places in the area include Netley Castle (3.7 miles south) and Marlands Shopping Centre (2.9 miles south-west). For a walk, there’s Netley Common.
Can I do it myself?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
What the job involves on each surface
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.
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. If that is happened, we rake it out and reseal it properly where it can be done safely.
Chartwell Green questions
Will you come out to Chartwell Green?
Yes, we do. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
I let a flat near Swaythling station. Can you help?
Yes. We work for letting agents and landlords as well as householders. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear price.
Are you fully insured?
Yes. Full insurance covers our work.
Do I need to be at home?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you do not need to watch us work.
What colours does the sealant come in?
The sealant colour is picked to suit the wall so the joint blends in. There’s a wide choice of exterior colours.
Is there a guarantee?
Yes, always. There’s a 12-month guarantee on every job, large or small.
Do you use backing rod?
That’s backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only, which would stop it stretching.
Which products do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we’ll explain our choice.