Greater London · England
North Hyde External Mastic
External mastic for North Hyde, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rigid filler in a joint that should flex
- Weeds or debris growing in open joints
- Joints where the bead has come unstuck
When it isn’t the sealant
It helps to know what we can’t do:
- Cracked brickwork or render that needs a builder or plasterer
- Cutting new joints into brickwork, which is building work rather than sealant work
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think before you book.
Where we work in North Hyde
- Copings & trims
- Façade panels
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
- Brickwork movement joints
External mastic for homes and businesses in North Hyde
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. We work on brickwork movement joints, render & cladding joints and concrete & block, and people most often call us about failed seals between different materials and failed sealant between panels on a façade.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. For a home in North Hyde, tell us how high the joints are and how to reach the back of the building.
Each job carries a 12-month guarantee, whatever its size.
- Where
- North Hyde (UB2, TW5)
- Region
- Greater London
- Cover
- One year on every job
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Leave the joints unpainted unless we have said otherwise
- Act on the first splits you see
- Keep high-pressure jets off the joints
- Tell anyone working on the walls about the movement joints
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal before water has had years to get in.
What affects the cost of external mastic
Jobs vary more than people expect. The main factors:
- The number and length of the joints
- The type of sealant required
- How many areas need sealing
- Any working-time requirements on site
Combining jobs into one visit is generally more efficient than separate visits. You will get one clear quote for the whole job.
What to tell us for a quote
Photos help, but a description is a good start. Try to tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- Where the property is
- Whether it has been sealed before
- How many joints, rooms or windows are involved
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or drop us an email.
How the visit works
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes a few hours for a handful of joints, longer for a whole elevation and we leave things clean and tidy. In North Hyde, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- 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.
Getting ready for the visit
- For indoor joints, keep the area dry beforehand if you can
- Tell us about any water getting in
- Mention any tricky access
Getting a quote
Every job is quoted individually, so start by telling us what you need. Simply phone 0345 464 0079 or email us and describe the job, and pictures are welcome.
Advice
Why it’s worth doing now in North Hyde
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost near the open joint, so the problem grows beyond the joint itself. In a flat in North Hyde, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
Why book with us
- A sealant colour to suit the surroundings
- An ARBOMaster approved applicator
- We never seal over old sealant
- A choice of colours where the product allows
See our cost guide or customer reviews.
FAQs for North Hyde
Do you work for landlords with property near Southall station?
Yes, we work for letting agents and landlords. Just call 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear price.
Can you do external mastic in North Hyde?
Yes. We work across London and the South East, and North Hyde is part of that. Just call 0345 464 0079 or email us with a few details of the job, and we will send you a clear quote.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Can you work on commercial sites?
Yes, regularly. Larger jobs can be planned room by room or area by area.
Do you take out the old sealant first?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
What does external mastic cost?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
Should I point up the gap in my brickwork?
No. A mortar-filled joint cannot move, so the wall cracks somewhere else instead. Use a flexible sealant with backing rod.
Walls and rooflines in North Hyde
With historic houses such as Osterley House (about 1.3 miles east) nearby, there’s older building stock in the area around North Hyde 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. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
North Hyde is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Schools such as Norwood Green Infant and Nursery School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
North Hyde is about 1 mile south of Southall, in Greater London. Every kind of property in North Hyde is covered for external mastic. The work is guaranteed for a year. North Hyde is one of 764 towns and villages in Greater London where we work for external mastic. For nearby work, see our London page, about 12 miles away.
Jobs for external mastic in UB2 and TW5 works the same way as everywhere else we cover. You will find streets such as Lea Road, Fern Lane and Court Road. Being close to the A3005, North Hyde is easy for our applicators to reach for external mastic. We also cover Heston (1 mile south), Norwood Green (1 mile east), Osterley (1 mile east), Lampton (1 mile south-east) and Hounslow West (2 miles south). Further out, we also cover London (12 miles east), City of Westminster (10 miles east), Marylebone (10 miles east), Kensington (8 miles east), St Pancras (12 miles east) and Shoreditch (13 miles east).
What’s near North Hyde
Typical jobs here are in homes near Minet Country Park, The Plough Public House and Featherstone High School, among other places. The nearest railway station is Southall station, about 1 mile north of the centre. Well-known places in the area include Museum of Army Music (2.9 miles south-east) and St Bernard's Hospital (1.6 miles north-east). Green spaces nearby include Long Wood and Garden Lake.
How the job changes by surface
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. Their movement joints are sealed over backing rod with a flexible sealant.
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible.
Also near North Hyde
What else we do in North Hyde
Do you need external mastic in North Hyde?
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it can’t stretch and tears as soon as the joint widens.
Keep an eye out for any of the following:
- Sealant pulling away from one side of the joint
- Rain getting behind render or cladding at a joint
- Movement joints filled with mortar instead of sealant
- Failed sealant between panels on a façade
Rented homes near Southall 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
- When the joint can take water or movement
- Is VAT in the price?
- How hidden problems are handled
- What product goes in the joint