Hampshire · England
Dunbridge External Mastic
We cover Dunbridge for 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
- Failed seals between different materials
- Water getting into walls through failed joints
What happens on the day
We bring everything the job needs with us, so you do not need to buy or prepare anything. Once we have agreed what’s being done, we protect the area and start. It normally takes a few hours for a handful of joints, longer for a whole elevation. For a village or hamlet like Dunbridge, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- 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.
Getting ready for the visit
- Tell us if parking is tricky
- Mention any sign-in or site rules at work premises
- Tell us about any water getting in
Ask for a quote
Need a quote? Please call 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
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External mastic in Dunbridge, done properly
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing all tend to fail early. We take the old material out and do it properly. We work on joints between brick and frames, copings & trims and concrete & block, and common reasons people get in touch are rigid filler in a joint that should flex and movement joints with cracked, split or missing sealant.
Outside joints can only be sealed when they’re dry, so work in Dunbridge is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Place
- Dunbridge (SO51)
- Wider area
- Hampshire
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Also near Dunbridge
Other services in Dunbridge
DIY sealant or a professional job?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
External mastic in Dunbridge: local notes
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Mottisfont Abbey (about 0.7 miles north-east) nearby, there’s older building stock in the area around Dunbridge as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
If you live in an older home near Church of St Andrew, the joints between older walls, newer extensions and the roofline need a sealant that can move. Schools such as Awbridge Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. For landlords with property near Mottisfont & Dunbridge station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Dunbridge is about 4 miles north-west of Romsey, in Hampshire. From the centre of Dunbridge to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Dunbridge is one of 683 places in Hampshire where we work. There’s also a page for Southampton, roughly 10 miles from Dunbridge.
All of SO51 is covered for external mastic, from the main roads to the quietest streets. Nearby, we also carry out external mastic in Mottisfont (1 mile north-east), Kimbridge (1 mile south-east), Stonymarsh (1 mile north-east), Carter's Clay (1 mile south-west) and Lockerley (1 mile west). Larger places within reach include Winchester (10 miles east), Eastleigh (10 miles south-east), Andover (13 miles north), Totton (8 miles south), Chandler's Ford (8 miles south-east) and Hedge End (13 miles south-east).
Landmarks near Dunbridge
We work in homes and buildings around The Bear And Ragged Staff Public House and the streets around them. There’s a railway station in Dunbridge itself: Mottisfont & Dunbridge station. Other landmarks nearby include Romsey Community Hospital (3.9 miles south-east) and King Johns House (3.5 miles south-east).
Quotes for external mastic in Dunbridge
Every job gets its own quote. This is what makes a difference:
- Whether there’s mould to deal with
- The number and length of the joints
- Which sealant suits the joint
- When we can work, for business premises
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, call 0345 464 0079 or email us and we will give you an honest view and a quote.
What to tell us for a quote
Before you ask for a quote, have a think about:
- The rough size of the job
- Where the property is
- If it’s domestic, commercial or a hotel
- What the problem is, such as mould, gaps, leaks or cracking
We quote each job on its own. Simply ring 0345 464 0079 or email us and describe the job.
Why act early in Dunbridge
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. Around Dunbridge, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we will go through it with you.
What you get with us
- Fully insured
- 180+ five-star Google reviews
- White, clear, grey or another colour, product permitting
- We agree the colour with you first
See what affects the cost and our reviews.
How the job changes by surface
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. We reseal their joints with backing rod and a flexible product.
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. That movement goes into the joint, so the sealant in it must stay soft and stretchy.
FAQs for Dunbridge
Do you cover smaller places like Dunbridge?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Do you cover Dunbridge for external mastic?
Yes. We work across London and the South East, and Dunbridge is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear quote.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We will tell you how long to leave the joint before we leave.
Do you work for landlords and businesses?
Yes. As well as homeowners, we work for landlords, agents, businesses and hotels across Hampshire.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we will explain our choice.
Where is Mr Mastic based?
We’re based in Crawley, and we cover South East England, London and all of Scotland.
Landlords, agents and businesses in Dunbridge
We work for landlords and agents as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
What sealant work cannot fix
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Adding movement joints to masonry that has none
- Movement that’s more than a sealant joint can take
- Loose or hollow render, which needs re-rendering
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.
Surfaces we seal
- Façade panels
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
- Joints between brick and frames
- Copings & trims