Greater London · England
New Build Mastic in Blendon
We cover Blendon for plot mastic for developers and snagging failed sealant in new homes. Old material cut out, joints cleaned and sealed neatly.
- Gaps behind new kitchen upstands
- Shower seals failing in the first year or two
- Joints pulling apart as timber shrinks
New build mastic in Blendon
Some new-home owners let the house settle before resealing. That makes sense for small gaps that are just cosmetic, but a seal that’s letting water through needs doing now. We are often asked to deal with messy sealant that spoils new finishes and beads laid onto grit and dust from the build, on bathrooms & en suites, show homes and windows & doors.
New flats are going up across London, many of them in larger developments. In a new development, snags are often reported through the developer or the managing agent, and failed shower seals, open skirting joints and gaps at thresholds are typical.
Each job carries a 12-month guarantee.
- Where
- Blendon (DA5, DA15, DA6)
- Region
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
How we quote for new build mastic
Jobs vary more than people expect. The main factors:
- The number and length of the joints
- Access and height
- Whether there’s mould to deal with
- Any working-time requirements on site
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
What we need to know
When you contact us, it’s useful to know:
- If it’s domestic, commercial or a hotel
- Roughly how big the job is
- What the problem is, such as mould, gaps, leaks or cracking
- Where the property is
Asking for a quote is easy: let us know the job and the location and its rough size. A few photos by email make the job easier to understand.
What else we do in Blendon
What new build mastic looks like in Blendon
Many of London’s new homes are flats in bigger developments, where snags may need reporting through the developer or the managing agent. 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.
For new homes near Albany Park station, it’s worth checking the sealant early, while snags are still fresh. Blendon is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Blendon is about 1 mile south-east of Welling, in Greater London. Every kind of property in Blendon is covered for new build mastic. Every job comes with our one-year guarantee. Our Greater London coverage runs to 764 places, Blendon among them. You can also see our page for London, roughly 10 miles from Blendon.
Jobs for new build mastic in DA5, DA15 and DA6 is quoted and booked the same way as anywhere else. If you need new build mastic at a property on Penn Lane, Hurst Road and Brook Lane or a nearby road, we can help. Being close to the A221, Blendon is easy for our applicators to reach. We also cover Bexley (1 mile south-east), Crook Log (1 mile north), Welling (1 mile north-west), Upton (1 mile north-east) and Bexleyheath (1 mile north-east). Larger places within reach include London (10 miles west), City of Westminster (13 miles west), Marylebone (13 miles north-west), Kensington (14 miles west), St Pancras (12 miles north-west) and Shoreditch (10 miles north-west).
What’s near Blendon
Locally, jobs take us to homes and businesses close to Danson Park, The Royal Oak Public House and Hurst Primary School. The nearest railway station is Albany Park station, about 0.8 miles south of the centre. Nearby you will also find Metropolitan Police Museum (1.3 miles south-west) and Bexley Hospital (0.8 miles north-east). Open spaces near Blendon include Wansunt Pit and Summer Hill.
What happens if it’s left?
It often makes sense to do all the sealant items on a snagging list together. It’s one visit, one quote and one set of cure times to plan around. In a flat in Blendon, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why book with us
- An ARBOMaster approved applicator
- Domestic, commercial and hotel work
- Fully insured
- One-year guarantee on every job
See our cost guide or what customers say.
Landlord and commercial work in Blendon
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote, and we are fully insured.
Can I do it myself?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
What the job involves on each surface
Plot handovers
Plot mastic is carried out to the developer’s schedule. Each joint is cleaned and primed where needed.
Show homes
We can refresh show-home sealant that has discoloured or been knocked. The old bead comes out and a clean new one goes in.
When it is not the sealant
Some problems need a builder, plumber or other trade rather than us:
- Structural cracks in walls or ceilings
- Your warranty claim itself, which is between you and the builder
- Damaged fittings that need replacing
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly before you book.
Joints and surfaces we work on
- Show homes
- Plot handovers
- Bathrooms & en suites
- Skirting & floors
- Windows & doors
- Kitchens
How the visit works
On the day, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before any work starts. Most jobs take a few hours in a single home. For a job in Blendon, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We start by going through the snagging items or plot schedule with you.
- Every bit of the old builder’s sealant is cut out down to clean surfaces.
- We clean out the dust and grit left from the build.
- Primer goes on where the surface and product need it, then the new sealant.
- Each bead is tooled and the cure times explained.
How to prepare
- Let us know if you’ve seen damp or leaks
- Keep pets and children clear of the area while we work
- Let us know about earlier repairs to the joints
Get a quote
Want a quote for new build mastic? Please ring 0345 464 0079 or email us and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
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Your questions about new build mastic in Blendon
I let a flat near Albany Park station. Can you help?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Can you do new build mastic in Blendon?
Yes. Our work covers London and the South East, and Blendon is part of that. You can call 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear price.
What does new build mastic cost?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Will you just run a new bead over the existing one?
No. New silicone will not bond to old silicone, so sealing over the top fails quickly. The old sealant always comes out first.
What colour sealant will you use?
That depends on what the joint meets: white or clear for most sanitary joints, colours for worktops, floors and frames. We will agree it with you first.
Will you leave a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Should I wait before resealing?
Any seal that is leaking should be redone straight away. For small cosmetic gaps, waiting until the house has settled can save doing them twice.
Can you work from my snagging list?
Yes. Send the list and a few photos of the sealant items and we will give you a quote. We will tell you if anything on it is not a sealant job.