Greater London · England
Mildmay New Build Mastic
Professional new build mastic in and around Mildmay, with old sealant always removed completely and a 12-month guarantee.
- Cracked sealant around new window and door frames
- Sealant applied over dusty or wet surfaces
- Worktop and upstand sealant coming away
About our new build mastic in Mildmay
Developers send us the plot schedule and we work through it. We seal bathrooms, kitchens, windows, doors and skirting so plots are ready to hand over. Common call-outs are for kitchen sealant that has pulled off the wall and gaps opening as the house dries out and settles, on kitchens, bathrooms & en suites and windows & doors.
Much of London’s new housing is flats in larger developments. Snagging there often goes through the developer or managing agent, and shower seals that fail early, skirting joints that open up and gaps at thresholds are all common snags.
Whatever the size of the job, it’s backed by our one-year guarantee.
- Place
- Mildmay (N1, N16, E8)
- Region
- Greater London
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY versus a professional finish
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
The process
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes a few hours for most snagging lists, longer for a run of plots from start to finish. In Mildmay, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We go through the snagging list or plot schedule and agree the joints to do.
- The old bead comes out in full, with no layer left behind.
- Each joint is cleaned of dust and grit, then primed if required.
- New sealant suited to each joint is applied and tooled neatly.
- We check every joint and tell you how long each needs to cure.
How to prepare
- Let us know if you’ve seen damp or leaks
- Let us know about parking restrictions
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
There’s no standard price list. Instead, we give you a clear price for your job. To arrange one, ring 0345 464 0079 or drop us an email.
Read more
How we quote for new build mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- Any working-time requirements on site
- Mould in or behind the old joints
- How many rooms, windows or areas are involved
- Whether the work is at height
The cost reflects the work involved, not guesswork. That’s why we ask about the job first and send you a clear quote before we start.
Asking for a quote
When you call or email, these details help:
- Any previous sealing or DIY work
- The problem you’ve noticed
- The rough size of the job
- Where the property is
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we will talk you through the work before giving you a price.
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Keep photos and emails about snagging items
- Use the extractor fan every time you shower
- Follow the cure time we give you
- Put sealant faults on your snagging list early
Clean the sealant with a mild detergent and a soft cloth. Keep scourers and harsh chemicals off it as they wear the bead.
A failed seal in a new home lets water into joists, plasterboard and ceilings. Catching it early keeps the fix to the sealant and protects the rest of the house.
Honest limits
In fairness, some problems need a different trade:
- Cracked trays, tiles or worktops
- A tray or bath that isn’t properly supported, until it’s fixed
- Plumbing faults behind the sealant
If you are not sure, just ring 0345 464 0079 or email us and we will give you a straight answer.
Surfaces we seal
- Show homes
- Skirting & floors
- Kitchens
- Windows & doors
- Bathrooms & en suites
- Plot handovers
Why it’s worth doing now in Mildmay
A failed shower or bath seal in a new home lets water into floors and walls that are still drying out. Resealing promptly protects the new finishes around it. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Mildmay, the repair is bigger than a sealant job.
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs. Call for a quick quote and we will explain what it covers.
Why us?
- We never seal over old sealant
- White, clear, grey or coloured to suit, where the product allows
- Anti-fungal sanitary silicone in wet areas
- 4.9 on Google from 180+ five-star reviews
Take a look at what affects the cost and what customers say.
Places near Mildmay
What else we do in Mildmay
Different surfaces, different methods
Kitchens
New-kitchen sealant is often applied in a rush. We remove it and reseal with a kitchen-suitable sealant.
Bathrooms and en suites
En suite seals are easy to miss on a snagging list until they leak. Resealing properly keeps water where it belongs.
Joints and finishes in Mildmay homes
Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
As a London address, Mildmay can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. For new homes near Dalston Kingsland station, it’s worth checking the sealant early, while snags are still fresh.
Mildmay is about 1 mile north of Hoxton, in Greater London. From the centre of Mildmay to the outskirts, we cover new build mastic for every kind of property. Our area takes in 764 places across Greater London, large and small.
Postcode districts we cover here for new build mastic: N1, N16 and E8. If you need new build mastic at a property on Dove Road, Essex Road and Burma Road or anywhere close by, we can help. Mildmay is on the A1199, which makes it straightforward to reach. We also cover Newington Green (1 mile north), De Beauvoir Town (1 mile south), Canonbury (1 mile south-west), Kingsland (1 mile south-east) and Highbury (1 mile west). Further out, we also cover London (3 miles south), City of Westminster (4 miles south-west), Marylebone (3 miles south-west), Kensington (6 miles south-west), Walthamstow (4 miles north-east) and Hampstead (4 miles west).
Landmarks near Mildmay
Locally, jobs take us to homes and businesses close to City of London Academy Highbury Grove, Highbury Fields and Army and Navy pub. Mildmay has its own railway station: Dalston Kingsland station. Well-known places in the area include Clowns Gallery-Museum (0.6 miles south-east) and Hackney Walk (1.5 miles east). For a walk, there’s Gillespie Park and Ludgate Hill.
Questions from Mildmay
Do you cover Mildmay for new build mastic?
Yes, Mildmay is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job.
Is parking an issue for new build mastic in Mildmay?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Is there any odour?
It depends on the product. Some smell for a while, some hardly at all.
Why has my new-build shower seal failed already?
It’s common, and there are normally two reasons: movement as the house dries and settles, and sealant laid onto dust without primer. Cutting it out and resealing properly fixes both.
How long before the joint can be used?
Cure times vary by product and the temperature. Before we leave, we’ll tell you the cure time.
My new home is still under warranty. Should I contact you?
Start with the builder if you are in the snagging or warranty period. Once that is done, or if they won’t put it right, we can reseal it properly.
What sealant do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.