Hampshire · England
Cottonworth External Mastic
Our applicators work in Cottonworth on sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Joints where the bead has come unstuck
- Movement joints filled with mortar instead of sealant
- Failed seals between different materials
Your questions about external mastic in Cottonworth
Do you cover Cottonworth for external mastic?
Yes. We work across London and the South East, and Cottonworth is part of that. You can phone 0345 464 0079 or send us an email and tell us what needs doing, and we’ll send you a clear quote.
Is Cottonworth within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you quote for more than one area?
Yes, and it often makes sense. Doing several areas at once is normally more efficient.
Can landlords and businesses book you?
Yes. We work in homes, commercial premises and hotels.
Can you work on commercial sites?
Yes. We can plan bigger jobs in stages to suit the site.
Where are you based?
We’re a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status, and we are fully insured.
What does external mastic cost?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
External mastic for homes and businesses in Cottonworth
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing, and we don’t skip that step. We work on concrete & block, brickwork movement joints and render & cladding joints, and people most often call us about sealant that has lost its bond to the brick or render and rain getting behind render or cladding at a joint.
External sealant needs dry, clean surfaces, so work around Cottonworth is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
Whatever the size of the job, you get the same one-year guarantee in Cottonworth and across Hampshire.
- Where
- Cottonworth (SP11)
- Region
- Hampshire
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
External mastic in Cottonworth: local notes
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.
Letting a property close to Andover station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Cottonworth is about 4 miles south of Andover, in Hampshire. For external mastic in and around Cottonworth, it’s easy to get a quote: please phone 0345 464 0079 or send us an email. We are based in Crawley and cover Hampshire, Cottonworth included. Across Hampshire, we cover 683 places, Cottonworth among them. For nearby work, see our Southampton page.
Every address in SP11 is within our area for external mastic, from the main roads to the quietest streets. Nearby, we also carry out external mastic in Fullerton (1 mile south-west), Chilbolton (1 mile east), Wherwell (1 mile north-east), Wherwell Wood (1 mile north) and Leckford (1 mile south). We also work in nearby towns such as Winchester (9 miles south-east), Eastleigh (14 miles south), Andover (4 miles north), Chandler's Ford (12 miles south), Romsey (11 miles south) and Hyde (9 miles south-east).
Near you in Cottonworth
Locally, jobs take us to homes and businesses close to Longstock Park and Abbots Mitre pub, among other places. The closest station to Cottonworth is Andover station, roughly 4.1 miles north of the centre. Nearby you’ll also find Andover War Memorial Hospital (4.4 miles north) and Andover Museum (3.8 miles north). Open spaces near Cottonworth include Anton Lakes and Mill Lake.
Work for landlords, hotels and businesses
From a single let to 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 easy to sort out between tenants. Several properties can go on one quote.
Towns and villages near Cottonworth
What else we do in Cottonworth
Common problems we fix in Cottonworth
Using the wrong sealant is another common reason. A stiff, general-purpose sealant cannot cope with a joint that moves a lot, and it tears off the sides.
It’s worth asking for a quote if you see:
- Failed seals between different materials
- Movement joints filled with mortar instead of sealant
- Sealant pulling away from one side of the joint
- Panel joints letting water in
In the older streets around Church of St Mary the Less, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Comparing quotes
- Whether they’re fully insured
- How long the guarantee is
- What the cure time is
- Who does the work, and how experienced they are
Why deal with it now?
It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together, and access only has to be arranged once. Around Cottonworth, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
A failed joint rarely gets cheaper to fix by waiting. If you are not sure whether it needs doing, ring 0345 464 0079 or email us and we’ll give you an honest view and a quote.
What you get with us
- You choose the colour before work begins
- Experience in homes, commercial sites and hotels
- A 12-month guarantee on all work
- A sealant colour to suit the surroundings
See what affects the cost and our reviews.
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
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.
What the job involves on each surface
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. Where one has been mortared, we cut it out and reseal it with sealant.
Joints between dissimilar materials
Different materials may need different primers. Both surfaces are cleaned and primed as the product requires.
How we quote for external mastic
Every job gets its own quote. This is what makes a difference:
- The old material and how stubborn it is
- Whether the work is at height
- Which sealant suits the joint
- Whether there’s mould to deal with
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part.
What we need to know
To help us quote quickly, let us know:
- Whether it has been sealed before
- What’s wrong with the joints now
- Pictures of the joints, sent by email
- Whether it’s a home or a business
For external mastic in Cottonworth, ring 0345 464 0079 or send us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
The process
At the end, we look at the finished work together and explain the cure time. The work normally takes a few hours to a few days, depending on the length of joint and the access, depending on the size of the job. Somewhere as small as Cottonworth, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- 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.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- Mention any parking rules near the property
- Where the joints are inside, avoid wetting them before we arrive
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved.