Surrey · England
Hog Hatch External Mastic
Movement joints in Hog Hatch need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Sealant that has lost its bond to the brick or render
- Cracked joints where brick meets render or frames
- Hard, crazed mastic that has stopped moving
External mastic in Hog Hatch
Getting the depth right is half the job. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, leaving it bonded to two faces so it can move with the wall. We work on façade panels, joints between brick and frames and render & cladding joints, and people most often call us about weathered mastic that no longer stretches and rain getting behind render or cladding at a joint.
Houses in smaller places like Hog Hatch can stand more in the open than those in a built-up town, so exposed walls and rooflines take more wind-driven rain. Joints on those sides are normally the first to go.
We stand behind the work with a 12-month guarantee.
- Where
- Hog Hatch (GU9)
- Wider area
- Surrey
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
What affects the quote in Hog Hatch
For a quick quote, just ask. What matters most is:
- Access and height
- The old material and how stubborn it is
- The amount of work
- The number of rooms or windows
What it costs depends on the size of the job, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
What to tell us for a quote
To help us quote quickly, please include:
- A few photos by email, if you can
- Whether it has been sealed before
- The rough size of the job
- The address or postcode of the job
We do not publish a price list, because every job is different. Instead, we send you a clear quote for your job. To arrange one, phone 0345 464 0079 or email us.
Nearby places to Hog Hatch
What else we do in Hog Hatch
How it works
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take anything from a few hours to several days, depending on the building. A visit to Hog Hatch is planned like any other: the time, the access and where to park are agreed in advance. 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.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Preparing for the visit
- Move anything stored near the joints
- Tell us if parking is tricky
- Keep pets and children clear of the area while we work
Getting a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email pictures if that is easy.
Related advice
How to look after the new joints
So the new joints stay in good condition:
- Make sure movement joints aren’t pointed over
- Get split or bare joints resealed while the damage is small
- Tell anyone working on the walls about the movement joints
- Wash walls gently around the sealant
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
Once a joint cannot move, the wall finds another way, normally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
Leave it or put it right?
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render around the joint, so the problem grows beyond the joint itself. In a smaller place like Hog Hatch, 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.
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why Hog Hatch customers choose us
- We never seal over old sealant
- We’re fully insured
- We leave the area clean and tidy
- You choose the colour before work begins
See what affects the cost and what customers say.
Hog Hatch buildings and the weather
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Farnham Castle (about 0.9 miles south) are a reminder that the area around Hog Hatch has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
In the older streets around St Mark the Evangelist Church, the joints between older walls, newer extensions and the roofline need a sealant that can move. Schools such as Folly Hill Infant School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Hog Hatch is about 2 miles north of Farnham, in Surrey. Across the GU9 area, we cover external mastic for homes and businesses. Hog Hatch is one of 395 towns and villages in Surrey we cover for external mastic. You can also see our page for Reading, about 17 miles away.
Here we cover the GU9 postcode area for external mastic. Whether your property is on Coniston Drive, Dukes Walk and Folly Hill or anywhere close by, we can help. Neighbouring places we cover for external mastic include Ewshot (1 mile north-west), Dora's Green (1 mile west), Warren Corner (1 mile west), Dippenhall (2 miles south-west) and Redlands (2 miles west). We also work in nearby towns such as Guildford (10 miles east), Woking (12 miles north-east), Camberley (8 miles north-east), Frimley (7 miles north-east), Haslemere (11 miles south) and Cranleigh (15 miles south-east).
Around Hog Hatch
Typical jobs here are in homes near Farnham Heath End School and Weybourne LNR, among other places. Hog Hatch’s nearest station is Farnham station, roughly 1.5 miles south-east of the centre. Nearby you will also find Hart Shopping Centre (3.7 miles north-west) and Museum of Farnham (1.3 miles south). The countryside around Hog Hatch includes Farnham Park and Aunt's Pool.
Landlords, agents and businesses in Hog Hatch
We work for letting agents and landlords as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Do you need external mastic in Hog Hatch?
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
Look out for any of the following:
- Sealant that has lost its bond to the brick or render
- Water getting into walls through failed joints
- Gaps where render, brick and frames meet
- Hard, crazed mastic that has stopped moving
Letting a property close to Farnham station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
What your quote should include
- What happens if the job turns out different
- What preparation is included
- Which colour the sealant will be
- The length of the guarantee
Common questions in Hog Hatch
Is Hog Hatch in your area for external mastic?
Yes, Hog Hatch is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing.
Will you come out to Hog Hatch?
Yes, Hog Hatch is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can tenants book the work?
Yes, though it’s best to check with your landlord first. Many landlords are glad to have it sorted.
How long does external mastic last?
It varies with how exposed the wall is and how much the joint moves. Signs to watch for are cracking, hardening and gaps at the edges, and reseal at that point.
How long will you be here?
A typical job takes a few hours to a few days, depending on the length of joint and the access, including the preparation. Your quote will say how long we expect yours to take.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Can you reach joints on upper floors?
It depends on the building. Tell us the height, the number of joints and what’s below them, and we will confirm what access is needed.
Will the new joint stand out?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We pick the one that suits your wall best so the joint does not draw the eye.