Greater London · England
Gutter Sealing in New Barnet
Problem with your gutter and fascia joints in New Barnet? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Water running down the wall below the gutter
- Water dripping where gutter sections meet
- Stop ends leaking at the end of a run
Gutter sealing in New Barnet
Failed sealant round a garage door frame lets rain blow in. The frame joint is cut out and resealed using a sealant made for outdoor use. If you have old gutter sealant that has let go and water dripping where gutter sections meet, we can put it right.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. 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.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Where
- New Barnet (EN5, EN4, N20)
- Region
- Greater London
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Can I do it myself?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly.
Nearby places to New Barnet
Also in New Barnet
How to look after the new joints
After the cure time, these simple habits help:
- Have sagging gutters refixed early
- Look at the gutters while it’s raining
- Keep an eye out for wet patches below a joint
- Look along the fascias for open joints
Clear the gutters once or twice a year so water does not sit on the joints. Water left in a gutter tests every joint.
Rain getting in round a garage door frame can damage what’s stored inside. A reseal sorts it while the frame is sound.
Landlord and commercial work in New Barnet
If you manage several properties in or around New Barnet, several properties can go on one quote. Send us the addresses and the work at each.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will give you a quote.
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Boards that have decayed or split
- Leaks from the roof rather than a joint
- Cracked, split or warped gutter sections
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Joints and surfaces we work on
- uPVC fascias
- Gutter end caps
- Gutter joints
- Roofline trims
- Soffit joints
- Garage door frames
What gutter sealing looks like in New Barnet
Historic houses like Wyllyotts Manor (about 3.8 miles north) are a reminder that the area around New Barnet has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking.
If you look after a building such as St Mary's CofE Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. If you let a flat or house near New Barnet station, a dripping gutter joint or loose fascia trim is easy to miss until damp shows inside.
New Barnet is about 1 mile east of Barnet, in Greater London. Wherever you are in the EN5 postcode area, we can carry out gutter sealing at your property. New Barnet is one of 764 towns and villages in Greater London where we work. We also work in London, about 11 miles from New Barnet.
Here we cover the EN5, EN4 and N20 postcode area for gutter sealing. That includes homes and businesses on York Road, Park Road and Henry Road. Close by, we work in Barnet (1 mile west), Cockfosters (1 mile north-east), East Barnet (1 mile south-east), Underhill (1 mile west) and Whetstone (1 mile south). Larger places within reach include London (11 miles south), City of Westminster (9 miles south), Marylebone (9 miles south), Kensington (10 miles south), St Pancras (8 miles south) and Shoreditch (9 miles south-east).
Around New Barnet
Around New Barnet, our work takes us to homes and buildings near Trent School Cockfosters, East Barnet School and The Alexandra pub, among other places. There’s a railway station in New Barnet itself: New Barnet station. Nearby you’ll also find Spires Shopping Centre (1.6 miles north-west) and Francis Skaryna Belarusian Library and Museum (2 miles south). Not far away are Greenhill Gardens and Darland's Lake.
Questions from New Barnet
Do you work for landlords with property near New Barnet station?
Yes, we work for landlords and agents. Just call 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Can you do gutter sealing in New Barnet?
Yes. We work across London and the South East, and New Barnet is part of that. Just ring 0345 464 0079 or email us with a few details of the job.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we are fully insured.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
How long does gutter sealing take?
It depends on the size of the job, but as a guide it takes an hour or two for a few joints, longer for a full run. We will give you a better idea when we quote.
Is it messy?
Not at all. The area is protected while we work and cleaned up afterwards.
Where are you based?
We work from Crawley. Our applicators cover New Barnet, along with the rest of our area.
What information do you need?
Let us know what needs doing and where, plus pictures if you have them. We’ll ask anything else we need to know.
When to call us in New Barnet
Sagging sections pull joints apart. Resealing a sagging joint won’t last, so the gutter needs refixing first.
Most people get in touch after spotting something like this:
- Garage door frames letting rain in
- Open joints in fascias and soffits
- Water running down the wall below the gutter
- Old gutter sealant that has let go
As a London address, New Barnet can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Questions to ask before you book
- Whether VAT is included
- The length of the guarantee
- What product goes in the joint
- What preparation is included
Leave it or put it right?
Sealant won’t clear a blocked downpipe. We check the cause first and point you to the right trade if needed. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble for homes in New Barnet.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we will explain what it covers.
What you get with us
- Any old sealant cut out fully, not covered over
- 4.9 on Google from 180+ five-star reviews
- Trusted Arbo and Everbuild sealants
- Full insurance on every job
See our cost guide or customer reviews.
The process
Good joint work is mostly preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours, depending on the number of joints and the access. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- First, we find the drip and check the gutter is not cracked or sagging.
- The joint or trim is cleaned out and old sealant removed.
- The area is dried so the sealant can bond.
- An exterior or gutter sealant is applied to the joint.
- The run is checked and any debris near the joints is cleared.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Mention any tricky access
- For indoor joints, keep the area dry beforehand if you can
Get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that is easy.