Greater London · England
Floor & skirting joints in Underhill, Greater London
Sealing skirting-to-floor joints, tiled floor movement joints and concrete floor joints for homes and businesses in Underhill and across Greater London. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Perimeter joints in tiled floors filled with grout
- Open joints around bathroom floor edges
- Gaps at thresholds between rooms
For landlords and businesses
We also work for property managers and facilities teams. We can quote a run of properties together, and we’re fully insured for the work.
Failed sealant is one of the commonest items on a check-out report. Several properties can be quoted together.
Floor joint sealing in Underhill, done properly
Wet-area floor joints keep water out of the gap behind skirting and plinths. A flexible silicone seal keeps it out so water and dirt cannot get in. If you’re dealing with gaps between floors and kitchen plinths and perimeter joints in tiled floors filled with grout, we can put it right.
London homes range from new-build flats to period conversions with new floors laid over old boards. Wherever a floor meets a wall, a skirting or a threshold, the joint has to allow for movement.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we’ll put it right.
- Place
- Underhill (EN5, N20)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What floor joint sealing looks like in Underhill
Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent. Floors around Greater London run from suspended timber in older homes to concrete in newer houses and units, and they don’t all move the same way. That is why the skirting and threshold joints need a flexible seal.
Community buildings like St John the Baptist Church are part of the picture too: joints in its floors, skirtings and thresholds need resealing as they wear. Underhill is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Underhill is about 1 mile west of Barnet, in Greater London. Our applicators cover floor joint sealing for homes and businesses in Underhill. Our Greater London coverage runs to 764 places, and Underhill is one of them. London is on our list too, around 11 miles away.
All of EN5 and N20 is covered for floor joint sealing, from the main roads to the quietest streets. If you need floor joint sealing at a property on Park Road, May's Lane and Manor Road or anywhere close by, our applicators can take on the job. Neighbouring places we cover for floor joint sealing include Barnet (1 mile east), New Barnet (1 mile east), Monken Hadley (1 mile north), Hadley Wood (1 mile north-east) and Cockfosters (2 miles east). Larger places within reach include London (11 miles south-east), City of Westminster (9 miles south), Marylebone (9 miles south), Kensington (10 miles south), St Pancras (9 miles south) and Shoreditch (10 miles south-east).
What’s near Underhill
Around Underhill, our work takes us to homes and buildings near Susi Earnshaw Theatre School, Highlands Gardens and The Red Lion pub and the streets around them. For rail, the closest station is New Barnet station, about 1 mile east. A little further out are Francis Skaryna Belarusian Library and Museum (2.2 miles south) and Barnet General Hospital (0.9 miles west). Open spaces near Underhill include Greenhill Gardens and Darland's Lake.
Places near Underhill
More services for Underhill
Can I do it myself?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
What happens on the day
The work is kept neat and contained to the area we are working on, so you can get on with your day. The job generally takes a few hours, depending on the length of joint, and we explain the cure time before we leave. In Underhill, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We start by checking the floor, the joint and what traffic it takes.
- Any old caulk, grout or sealant is raked or cut out.
- The joint is vacuumed clean and backing fitted where needed.
- We apply the sealant in a colour that suits the floor.
- We tool it neatly and tell you when it can be walked on and cleaned.
Getting ready for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about any water getting in
- On commercial sites, let us know about site rules
Ask for a quote
We quote each job on its own, so the first step is telling us about yours. Simply phone 0345 464 0079 or send us an email and describe the job, and photos are welcome.
Read more
What affects the quote in Underhill
There’s no set price list, because jobs vary so much. The quote depends on:
- Mould in or behind the old joints
- Which sealant suits the joint
- The amount of work
- How many areas need sealing
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You’ll know the price before we begin.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- Any access issues, like height or stairs
- The problem you’ve noticed
- Where the property is
- Roughly how big the job is
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
Underhill questions
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 price.
Can parking be tricky for a visit in Underhill?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
My floor grout keeps cracking in a line. Can you help?
Often, yes, at the edges and along suitable lines. The grout is raked out and replaced with a flexible sealant in a colour to suit so the floor can move.
How soon can the floor be mopped?
We give you a cure time for each joint. Light use comes first, cleaning and heavy traffic later.
Can you use decorators’ caulk instead?
Caulk works on still, dry joints, but it cracks where there’s movement or water. For most floor joints, we use a flexible sealant.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Underhill.
Do you cover Underhill?
Yes, we do. Underhill is part of the area we cover, and the service is the same as everywhere else.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status, and we’re fully insured.
When something else is needed
A few problems are outside what sealant work can do:
- Tiles that have lifted or broken
- Damaged concrete that needs breaking out and repairing
- Bouncy or failing floorboards
If you’re not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
Where we work in Underhill
- Skirting boards
- Tiled floors
- Wet room & bathroom floors
- Concrete floor joints
- Commercial floors
- Thresholds
Why act early in Underhill
Open joints along wet floors let water into the subfloor and behind skirting. Dealing with it early keeps the repair to the joint. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Underhill, the repair is bigger than a sealant job.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you are unsure, phone 0345 464 0079 or email us for an honest opinion and a quote.
Why choose Mr Mastic in Underhill
- Every job guaranteed for a year
- We leave the area clean and tidy
- Colour agreed with you before work begins
- 180+ five-star Google reviews
Read what affects the cost and our reviews.
Common problems we fix in Underhill
Some floors were never given a perimeter gap or movement joint. It pushes against the walls and skirting as it expands, and the sealant or grout breaks.
Any of these means the joints need attention:
- Grout cracking in a straight line across a floor
- Failed joint filler in concrete floors
- Dirt and water collecting in open floor joints
- Rigid edge joints in tiled floors
For site and facilities teams at buildings such as St Catherine's RC School, floor joints in corridors, halls and entrances take heavy wear and need resealing before the edges break up.
Questions to ask before you book
- How long to leave it before use
- What product goes in the joint
- Whether they’re fully insured
- How long the guarantee is