Hampshire · England
New Forest External Mastic
Professional external mastic in and around New Forest, with every bit of old sealant taken out first and a 12-month guarantee.
- Old sealant gone brittle and cracked
- Failed sealant between panels on a façade
- Movement joints with cracked, split or missing sealant
Can I do it myself?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so just mention it when you contact us.
External mastic for homes and businesses in New Forest
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 line blends in. If you are dealing with joints where the bead has come unstuck and failed seals between different materials, we can help, on façade panels, concrete & block and copings & trims alike.
In a village or hamlet like New Forest, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
Every job comes with our one-year guarantee, wherever you are in Hampshire.
- Where
- New Forest (SP6)
- Wider area
- Hampshire
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Why it’s worth doing now in New Forest
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. In a small place like New Forest, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first.
Why New Forest customers choose us
- Anti-fungal silicone where joints get wet
- Domestic, commercial and hotel work
- More than 20 years in sealant work
- You choose the colour before work begins
Read what affects the cost or our reviews.
What happens on the day
Once we are on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes a few hours for a handful of joints, longer for a whole elevation. Somewhere as small as New Forest, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Before we arrive
- Mention any tricky access
- Tell us about any previous sealing or DIY attempts
- Let us know about parking restrictions
How to get a quote
Getting a quote is simple: let us know the job and the location. A few photos by email make the job easier to understand.
Advice
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Look over the joints every year, ideally after winter
- Keep water from gutters off the wall
- Act on the first splits you see
- Show decorators and builders where the movement joints are
Look over the joints once a year, ideally after winter. Watch for splits, edges coming away or growth in the joint.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal.
What sealant work can’t fix
Some problems need a builder, plumber or other trade rather than us:
- Loose or hollow render, which needs re-rendering
- Adding movement joints to masonry that has none
- Movement that is more than a sealant joint can take
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly.
Surfaces we seal
- Brickwork movement joints
- Copings & trims
- Façade panels
- Joints between brick and frames
- Concrete & block
- Render & cladding joints
Your questions about external mastic in New Forest
Do you cover smaller places like New Forest?
Yes. New Forest is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you do external mastic in New Forest?
Yes, New Forest is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or send us an email and tell us what needs doing, and we will give you a clear price.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We will tell you what we’re using and why.
How do I get a quote for external mastic in New Forest?
Size, access and the old material all affect the cost. Ask us for a quote and we’ll talk you through it.
Do you take out the old sealant first?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Will it make a mess?
Tidy work is part of the job. We protect what’s around the joints, and the area is left clean when we finish.
What should I tell you?
Tell us what needs doing and where. We’ll ask anything else we need to know.
How long before the joint can be used?
That depends on the sealant used, so follow the cure time we give you when we finish.
Outside joints around New Forest
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as Church of All Saints, the joints between older walls, newer extensions and the roofline need a sealant that can move. In and around New Forest, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
New Forest is in Hampshire. Our applicators cover external mastic for householders, landlords and businesses in New Forest and nearby, as part of our work across Hampshire. Our Hampshire coverage runs to 683 places, and New Forest is one of them. You can also see our page for Southampton, about 23 miles away.
Jobs for external mastic in SP6 works the same way as everywhere else we cover. Whether your property is on Sillens Lane and Townsend Lane or anywhere close by, our applicators can take on the job. Close by, we work in Martin (1 mile north-east), Rockbourne (3 miles east) and Damerham (3 miles south-east). Within a short drive, we also cover Ringwood (11 miles south-east), Fordingbridge (6 miles south-east), St Leonards (11 miles south), Alderholt (6 miles south-east), Poulner (11 miles south-east) and Ashley Heath (10 miles south).
Near you in New Forest
Well-known places in the area include Cranborne Castle Hill (4.4 miles south). The countryside around New Forest includes Western Downs.
Landlord and commercial work in New Forest
We also work for property managers and facilities teams in New Forest and across Hampshire. Several sites can be quoted together.
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
Towns and villages near New Forest
Other services in New Forest
Quotes for external mastic in New Forest
We quote each job individually. These are the things that affect it:
- Whether there’s mould to deal with
- Any working-time requirements on site
- The type of sealant required
- The number and length of the joints
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Ask us for a quote and we will explain what it covers.
What we need to know
Photos help, but a description is a good start. Try to tell us:
- The type of property
- Any previous sealing or DIY work
- Photos by email, if that is easy
- The problem you’ve noticed
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work and send you a clear quote.