Greater London · England
New-build mastic & snagging in Mill Hill, Greater London
New build mastic in Mill Hill from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Shower seals failing in the first year or two
- Messy sealant that spoils new finishes
- Skirting joints opening in the first winter
When it is not the sealant
In fairness, some problems need a different trade:
- Baths and trays that move too much for sealant to cope with
- Disputes or warranty claims with your builder
- Leaking fittings rather than failed sealant
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think.
Surfaces we seal
- Bathrooms & en suites
- Show homes
- Windows & doors
- Plot handovers
- Kitchens
- Skirting & floors
New build mastic for homes and businesses in Mill Hill
If your new home has a leaking shower seal, open skirting joints or untidy sealant, we can help. While the builder’s snagging or warranty period runs, report it to them first, and if it is not put right, get in touch with us. If you have untidy sealant flagged on a snagging list and cracked caulk along new skirting, we can help, whatever the surface.
Across London, commercial floors have movement joints that break down under heavy foot traffic, and new homes need their plot mastic finished properly before handover.
There’s a 12-month guarantee on every job.
- Location
- Mill Hill (NW7, N20)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
How we quote for new build mastic
Jobs vary more than people expect. What affects the quote:
- How easy the joints are to reach
- Whether there’s mould to deal with
- When we can work, for business premises
- The old material and how stubborn it is
Combining jobs into one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. We will give you a clear quote for the lot.
What we need to know
You do not need to know the technical terms. Just tell us:
- Access, such as stairs, a lift or height
- A few photos by email, if you can
- The problem you’ve noticed
- Where the job is, and your postcode
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, ring 0345 464 0079 or email us.
Places near Mill Hill
Also in Mill Hill
What we do, step by step
We bring everything the job needs with us, so there’s nothing for you to buy. After a quick look at the joints together, we protect the area and start. Most jobs take a few hours for most snagging lists, longer for a run of plots. In Mill Hill, 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 going through the snagging items or plot schedule with you.
- The failed sealant is removed completely, with no layer left behind.
- Joints are vacuumed and cleaned of building dust.
- We prime where needed and apply a sealant suited to each joint.
- We tool every joint neatly and tell you when each area can be used.
Before we arrive
- Plan for the work area to be out of bounds to pets and children
- Let us know about stairs, lifts or work at height
- Mention if the joints have been sealed before
How to get a quote
Every job is quoted individually, so the first step is telling us about yours. Simply call 0345 464 0079 or drop us an email and describe the job.
Advice
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Wipe joints with warm soapy water
- Look at the sealant regularly in the first couple of years
- Keep photos and emails about snagging items
- Don’t wait for the house to settle if water is getting through
Watch the joints as the house settles. Hairline gaps can open as timber and plaster dry and can be resealed later.
Don’t let the snagging period run out with sealant problems unreported. After that, putting it right may fall to you so report it promptly.
Why deal with it now?
For developers, getting the sealant right first time saves return visits. Every return visit for a failed seal takes time, and they’re avoidable with good preparation. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
What it costs depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
What you get with us
- White, clear, grey or another colour, product permitting
- Colour picked to suit the job
- Over 20 years’ experience
- One-year guarantee on every job
Take a look at what affects the cost or what customers say.
Different surfaces, different methods
Bathrooms and en suites
Baths, showers, basins and trays in new bathrooms are the most common new-build reseal. The old sealant comes out and anti-fungal sanitary silicone goes in after cleaning and priming.
Plot handovers
Send us the schedule and any sealant specification. We seal bathrooms, kitchens, frames and floors as agreed.
FAQs for Mill Hill
Is parking a problem for a job in Mill Hill?
Parking in Mill Hill, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
I let a flat near Mill Hill Broadway station. Can you help?
Yes. We work for landlords and letting agents as well as householders. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Are you fully insured?
Yes, we’re fully insured for domestic and commercial work.
Do you take on second-fix sealing for builders?
Yes. We take on second-fix sealant work across new plots. We clean and prime joints properly to keep callbacks down.
How do I get a quote for new build mastic in Mill Hill?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You will get a clear quote before work begins.
Do I have to be there?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you don’t need to watch us work.
Can I send you my snagging list?
Yes. Send us the sealant items on the list, with photos if you can, and we’ll quote. We’ll tell you if anything on it is not a sealant job.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We’ll give you the cure time for the product we used.
Work for landlords, hotels and businesses
If you manage several properties in or around Mill Hill, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together.
New build mastic around Mill Hill
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent.
As a London address, Mill Hill can be tricky for parking: let us know about parking bays, permits or a driveway. For new homes near Mill Hill Broadway station, it’s worth checking the sealant early, while snags are still fresh.
Mill Hill is about 1 mile north-east of Burnt Oak, in Greater London. We provide new build mastic to homes and businesses in Mill Hill, as part of our work across Greater London. Our area takes in 764 places across Greater London, large and small. You can also see our page for London, roughly 10 miles from Mill Hill.
All of NW7 and N20 is within our area for new build mastic, from the main roads to the quietest streets. We cover properties on Daws Lane, Byron Road and High Street and the roads around them. Nearby, we also carry out new build mastic in The Hale (1 mile west), Burnt Oak (1 mile south-west), Grahame Park (1 mile south), Totteridge (2 miles north-east) and Edgware (2 miles west). We also work in nearby towns such as London (10 miles south-east), City of Westminster (8 miles south-east), Marylebone (8 miles south-east), Kensington (8 miles south), St Pancras (8 miles south-east) and Shoreditch (9 miles south-east).
Local landmarks in Mill Hill
Around Mill Hill, our work takes us to homes and buildings near Mill Hill School, Copthall School and Bittacy Hill Park and the streets around them. Also close by are Francis Skaryna Belarusian Library and Museum (2 miles east) and Rising Sun pub (0.7 miles north-west). Mill Hill’s nearest station is Mill Hill Broadway station, about 1 mile south-west. Well-known places in the area include Broadwalk Centre (2 miles west) and Francis Skaryna Belarusian Library and Museum (2 miles east). Not far away are The Mill Field and Darland's Lake.