Hampshire · England
External Mastic in New Alresford
Specialist external mastic for New Alresford: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Joints pointed up with cement by mistake
- Moss and dirt in joints with no sealant left
- Hard, crazed mastic that has stopped moving
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
External mastic for homes and businesses in New Alresford
Short cuts in external joints show up within a season or two. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We strip the joint back and start again. We’re often asked to deal with plants rooting in failed movement joints and water getting into walls through failed joints, across brickwork movement joints, joints between brick and frames and concrete & block.
Around New Alresford, garages, outbuildings and extensions all add to the joints on the outside of a home. 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.
- Place
- New Alresford (SO24)
- Wider area
- Hampshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Towns and villages near New Alresford
Also in New Alresford
What the job involves on each surface
Cladding and façade panels
Cladding and façade panels are usually separated by sealed joints. We reseal them with a sealant suited to the panel material.
Copings and trims
Coping joints that leak let water straight down into the wall. Resealing them is a small job that protects a lot.
What we cannot put right
We will always be straight with you, so here’s what sealant can’t fix:
- Failed render or damaged cladding panels
- Movement that’s more than a sealant joint can take
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly before booking.
Where we work in New Alresford
- Concrete & block
- Façade panels
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Joints between brick and frames
How we quote for external mastic
There’s no set price list, because jobs vary so much. The quote depends on:
- The size of the job
- The type of sealant required
- Access and height
- Working hours on commercial sites
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.
What to tell us for a quote
To help us quote quickly, please include:
- Whether it’s a home or a business
- Where the property is
- Photos by email, if that’s easy
- If someone has resealed it before
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
Outside joints around New Alresford
With historic houses such as Hinton Ampner House (about 3 miles south) nearby, there’s older building stock in the area around New Alresford as well as newer homes. 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For an older house near a landmark such as Church of St John the Baptist, the joints between older walls, newer extensions and the roofline need a sealant that can move.
New Alresford is about 7 miles east of Winchester, in Hampshire. Anywhere in SO24, our applicators can take on external mastic. We cover 683 towns and villages across Hampshire, from the larger towns to small villages. Southampton is on our list too, about 15 miles from New Alresford.
All of SO24 is within our area for external mastic. You’ll find streets such as Station Road, Elm Road and Bramble Hill, and we cover them all. Main roads around New Alresford include the B3046 and B3047. We also cover Bishop's Sutton (2 miles east), Gundleton (2 miles east), Cheriton (2 miles south), Hinton Ampner (3 miles south) and Bramdean (3 miles south-east). Further out, we also cover Basingstoke (13 miles north), Winchester (7 miles west), Eastleigh (11 miles south-west), Horndean (14 miles south-east), Chandler's Ford (12 miles south-west) and Alton (9 miles north-east).
Near you in New Alresford
Around New Alresford, our work takes us to homes and buildings near The Running Horse Public House and Perins School and the streets around them. Well-known places in the area include Barton Castle (4.3 miles north-east). Open spaces near New Alresford include Shutts Copse.
Leave it or put it right?
Mortar or ordinary filler might look like a quick way to close an open joint, but it stops the joint moving. The wall then cracks somewhere else. A flexible sealant over backing rod is what the joint needs. In a smaller place like New Alresford, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
The cost depends on the size of the job, how much old material has to come out and access to the work. You will have a clear quote before any work starts.
What you get with us
- Tidy, careful work
- 4.9 on Google from 180+ five-star reviews
- Approved under the ARBOMaster scheme
- Trusted Arbo and Everbuild sealants
See what affects the cost and what customers say.
What happens on the day
Once we are on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to several days, depending on the building. A visit to New Alresford is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- 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.
- We clean both faces of the joint and prime them where the product calls for 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.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- Clear the area around the work
- Tell us about any previous sealing or DIY attempts
Ask for a quote
Getting a quote is simple: let us know the job and the location, and roughly how big it is. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.
Advice
Signs you need external mastic in New Alresford
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. The joint cannot move, so the wall cracks somewhere else instead.
If you can see any of these, it’s time to have the joints looked at:
- Rigid filler in a joint that should flex
- Gaps where render, brick and frames meet
- Moss and dirt in joints with no sealant left
- Panel joints letting water in
Managing a site like Sun Hill Junior School? Then larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before booking
- Whether you can choose the colour
- Is the old sealant removed completely?
- How the surfaces are prepared before sealing
- What the quote includes, VAT included or not
New Alresford questions
What guarantee comes with external mastic in New Alresford?
Every job comes with our one-year guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Do you cover New Alresford for external mastic?
Yes, New Alresford is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing.
Can tenants book the work?
We’re happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
Where are you based?
We work from Crawley. Our applicators cover New Alresford, along with the rest of our area.
Why do you put foam in the joint first?
That is backing rod, a closed-cell foam. It stops the sealant going in too deep and bonding to three sides.
Can you work on commercial sites?
Yes. Hotels, offices and other businesses use us, and we are fully insured.
Do you work for letting agents?
Yes, often. We can quote for several properties at once.
Do you have insurance?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.