Surrey · England
External Mastic in North Holmwood
External mastic in North Holmwood from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Sealant pulling away from one side of the joint
- Weathered mastic that no longer stretches
- Damp patches traced to an open external joint
What we do, step by step
Good joint work is mostly preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes anything from a few hours to several days, depending on the building. In a smaller place like North Holmwood, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Clear the area around the work
- On commercial sites, let us know about site rules
- Let us know if you’ve seen damp or leaks
Getting a quote
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we will talk you through the work before giving you a price.
Advice
About our external mastic in North Holmwood
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. We pick a colour that sits well with the wall. If you have damp patches traced to an open external joint and gaps where render, brick and frames meet, we can put it right, whatever the surface.
Outbuildings, garages and conservatories around homes in places like North Holmwood add more joints to look after. Leaks usually start at a gutter end, a garage door frame or where an extension meets the house.
Each job carries a 12-month guarantee.
- Place
- North Holmwood (RH5, RH4)
- Region
- Surrey
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Can I do it myself?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Walls and rooflines in North Holmwood
Historic houses like Polesden Lacey (about 3.8 miles north-west) are a reminder that the area around North Holmwood has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near Church of St John the Evangelist, older walls, gutters and the joints where extensions meet them need a flexible sealant. Schools such as St John's Church of England Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
North Holmwood is about 1 mile south of Dorking, in Surrey. If you need external mastic in North Holmwood, it’s easy to get a quote: please call 0345 464 0079 or drop us an email. We cover Surrey from our Crawley base. North Holmwood is one of 395 places in Surrey where we work. There’s also a page for Crawley, about 9 miles away.
We cover every part of RH5 and RH4 for external mastic and the streets around it. If you need external mastic at a property on Howard Road, Horsham Road and Inholms Lane or anywhere close by, we can help. Neighbouring places we cover for external mastic include Blackbrook (1 mile south-east), Mid Holmwood (1 mile south-west), Dorking (1 mile north), Pixham (2 miles north) and Westcott (2 miles north-west). Larger places within reach include Guildford (11 miles west), Woking (13 miles north-west), Epsom (9 miles north), Horley (7 miles east), Redhill (7 miles east) and Ewell (10 miles north).
Around North Holmwood
We work in homes and buildings around Inholms Clay Pit, The Priory CofE Voluntary Aided School and Royal Oak pub and the streets around them. North Holmwood’s nearest station is Dorking West station, about 1.8 miles north-west. Nearby you’ll also find Mesolithic Museum (3.7 miles west) and Headley Court (5.9 miles north). For a walk, there’s Reigate Heath and Box Hill.
Nearby places to North Holmwood
What else we do in North Holmwood
Landlord and commercial work in North Holmwood
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will quote.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Leave it or put it right?
A properly done movement joint is an even line in a colour that suits the wall. A rushed bead with no backing looks untidy and doesn’t last, so it pays to do it properly once. Around North Holmwood, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re not sure whether it needs doing, ring 0345 464 0079 or email us for an honest opinion and a quote.
Why us?
- Every job guaranteed for a year
- Anti-fungal silicone where joints get wet
- Rated 4.9 stars on Google
- 20+ years of sealant experience
Read our cost guide and our reviews.
What we are called out for in North Holmwood
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
The most common problems we see are:
- Rain getting behind render or cladding at a joint
- Joints pointed up with cement by mistake
- Brick movement joints where the sealant has split
- Weathered mastic that no longer stretches
Rented homes near Dorking West station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What to look for in a quote
- Which colour the sealant will be
- Whether all the old sealant comes out first
- Which sealant they’ll use, and why
- What the cure time is
North Holmwood: your questions answered
Is North Holmwood in your area for external mastic?
Yes. Our work covers London and the South East, and North Holmwood is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we will give you a clear price.
Is North Holmwood within the area you cover?
Yes, North Holmwood is covered. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Will you leave a mess?
We keep the work tidy. We protect what’s around the joints, and we clear up when we are done.
When will the joints need doing again?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. A yearly look will tell you when they need doing. Every job carries our 12-month guarantee.
Should I try DIY first?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Can you match the colour of my brickwork?
We choose a sealant colour to suit the brick, stone or render so the joint blends in. Exterior sealants come in a good range of colours.
Can landlords and businesses book you?
Yes, we do. We work in homes, commercial premises and hotels.
What do you need from me for a quote?
Only a few details: the address or postcode, what’s wrong and any access issues. Then ring 0345 464 0079 or email us.
What we can’t put right
To be straight with you, some problems need a different trade:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cutting new joints into brickwork, which is building work rather than sealant work
- Cracks in the bricks or render themselves, away from the joints
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly before you book.
Where we work in North Holmwood
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Render & cladding joints
- Façade panels
- Concrete & block
Quotes for external mastic in North Holmwood
Every job gets its own quote. This is what makes a difference:
- How easy the joints are to reach
- The number of rooms or windows
- Mould in or behind the old joints
- Which sealant suits the joint
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we will explain what it covers.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- Whether it’s a home or a business
- Roughly how big the job is
- Whether it has been sealed before
- Pictures of the joints, sent by email
Want a quote for external mastic? Please call 0345 464 0079 or drop us an email and tell us about the job. We’ll explain what we’d do and send you a clear quote before any work starts.