Greater London · England
External & façade joints in Hook, Greater London
Specialist external mastic for Hook: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Weathered mastic that no longer stretches
- Failed seals between different materials
- Movement joints with cracked, split or missing sealant
When something else is needed
We’ll always be straight with you, so here’s what new sealant will not do:
- Walls that need new movement joints cut into them
- Cracks in the bricks or render themselves, away from the joints
- Failed render or damaged cladding panels
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think before you book.
Joints and surfaces we work on
- Render & cladding joints
- Copings & trims
- Concrete & block
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
About our external mastic in Hook
A movement joint is only as good as its depth. 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. Common call-outs are for plants rooting in failed movement joints and sealant that has lost its bond to the brick or render, on brickwork movement joints, concrete & block and copings & trims.
Modern London flats rely on sealed movement joints and cladding joints. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall, and both kinds of building are found across London.
All our work comes with our 12-month guarantee.
- Place
- Hook (KT9, KT6, KT10)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
External mastic in Hook: local notes
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts.
Managing a site like St Paul's CofE Primary School? Then larger buildings have long runs of movement joint that eventually need resealing. As a London address, Hook can be tricky for parking: let us know about parking bays, permits or a driveway.
Hook is about 2 miles north-west of Ewell, in Greater London. Jobs in Hook get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Hook is one of 764 towns and villages in Greater London where we work. London is on our list too, around 13 miles away.
Postcode districts we cover here for external mastic: KT9, KT6 and KT10. That includes homes and businesses on Elm Road, Moor Lane and Glen Road. Hook sits on or near the A243. Close by, we work in Ditton Hill (1 mile north), Barwell (1 mile south-west), Long Ditton (1 mile north), Hinchley Wood (1 mile north-west) and Claygate (1 mile west). Further out, we also cover London (13 miles north-east), City of Westminster (12 miles north-east), Marylebone (12 miles north-east), Kensington (10 miles north-east), St Pancras (14 miles north-east) and Shoreditch (15 miles north-east).
Landmarks near Hook
In Hook, that means homes and buildings near Stokes Field, Shrewsbury House School and Southborough High School. There’s a railway station in Hook itself: Chessington North station. Nearby you will also find The Ashley Centre (3 miles south-east) and Tolworth Hospital (1.1 miles north-east). Open spaces near Hook include Kingston Hill Road area and The Lake.
Can I do it myself?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
What affects the cost of external mastic
Jobs vary more than people expect. The main factors:
- How much old sealant there is and how hard it is to remove
- Which sealant suits the joint
- Whether there’s mould to deal with
- The size of the job
What it costs 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 we need to know
To help us quote quickly, please include:
- Any access issues, like height or stairs
- Photos by email, if that’s easy
- How many joints, rooms or windows are involved
- If it’s domestic, commercial or a hotel
Want a quote for external mastic? 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.
How it works
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it normally takes a few hours for a handful of joints, longer for a whole elevation. In Hook, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- 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.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- Clear the area around the work
- Plan for the work area to be out of bounds to pets and children
Get 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 add pictures by email if you can.
Advice
Towns and villages near Hook
Also in Hook
FAQs for Hook
Do you cover Hook for external mastic?
Yes, Hook is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or drop us an email and let us know what needs doing.
Can you help a landlord with a rental near Chessington North station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we’ll send you a clear quote.
Can you seal joints between two different materials?
Yes. Materials like render, brick, metal and uPVC all move differently, so a flexible sealant is needed where they meet. The sealant is matched to both sides.
Can you reach joints on upper floors?
That depends on the building and the joints. We work on joints that can be reached safely. Tell us about the building and we’ll confirm what access is needed.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access.
How long does external mastic take?
That depends on the amount of work, but most jobs take anything from a few hours to several days, depending on the building. We will give you a better idea when we quote.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. Working times can be discussed when we quote.
When will the joints need doing again?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Make sure movement joints aren’t pointed over
- Leave the joints unpainted unless we’ve said otherwise
- Check external joints each spring
- Deal with leaking gutters that soak the joints below
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established so early resealing is worth it.
Do you need external mastic in Hook?
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.
Most people get in touch when they notice something like this:
- Weeds or debris growing in open joints
- Failed sealant between panels on a façade
- Gaps where render, brick and frames meet
- Old sealant gone brittle and cracked
For landlords with property near Chessington North station, outside joints that have cracked can let damp into a rental, so check them between lets.
Comparing quotes
- What the cure time is
- How much experience the applicator has
- Whether VAT is included
- Is the old sealant removed completely?
Surface by surface
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. We cut out the old sealant and reseal with a product suited to both surfaces.
Render joints
Water behind render can lead to blown patches. A sound joint keeps the render dry behind and helps it last.