Kent · England

New-build mastic & snagging in Dartford, Kent

New build mastic across Dartford and nearby, with every bit of old sealant taken out first and a 12-month guarantee.

  • Plot mastic for developers ahead of handover
  • Sealant that never bonded to the surface
  • Gaps behind new kitchen upstands

New build mastic for Dartford homes and businesses

What the job involves on each surface

Windows and doors

A draught at a new window can be a missed or failed joint. We check and reseal the frame edges.

Bathrooms and en suites

New-build bathrooms and en suites are where sealant fails most often. The old sealant comes out and anti-fungal sanitary silicone goes in after cleaning and priming.

New build mastic in Dartford, done properly

Building dust is behind a lot of failed new-build sealant. Each joint is cleaned of dust and primed where the product calls for it, so the new bead bonds properly. If you are dealing with sealant that never bonded to the surface and plot mastic for developers ahead of handover, we can put it right.

In a town like Dartford, skirting and floor joints open up as homes settle and floors move with the seasons. Those joints need a flexible sealant, as rigid filler soon cracks out.

Your job is guaranteed for a year, as with all our work.

Place
Dartford (DA1, DA2, DA5, DA13)
Region
Kent
Cover
A year, on every job
Quotes
Quoted before any work starts
Phone
0345 464 0079
Last updated
26 October 2026
Silicone being applied where a shower enclosure meets beige wall tiles

Should I try it myself first?

A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.

If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.

Quotes for new build mastic in Dartford

Jobs vary more than people expect. What affects the quote:

  • The number of rooms or windows
  • The old material and how stubborn it is
  • When we can work, for business premises
  • Mould in or behind the old joints

Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.

What we need to know

Before you ask for a quote, have a think about:

  • Any previous sealing or DIY work
  • Whether it’s a home or a business
  • A few pictures by email, if you can
  • Roughly how big the job is

If you are in Dartford and need new build mastic, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you will get a clear quote before any work starts.

Why it’s worth doing now in Dartford

Water getting past a failed seal in a new build reaches walls and floors that are still settling. Dealing with it early keeps the damage away from ceilings, floors and finishes. Around Dartford, failed sealant lets water into hidden places, like the floor under a bath, the back of a panel or the inside of a wall. Left alone, that means rot, damp and a bigger repair.

What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first and send you a clear quote before any work starts.

Why book with us

  • White, clear, grey or coloured to suit, where the product allows
  • Approved under the ARBOMaster scheme
  • Sanitary silicone with an anti-fungal additive in wet areas
  • Full insurance on every job

See how sealant jobs are priced and our reviews.

What we cannot put right

We’d rather tell you now than do work that won’t last, so these are the limits:

  • Leaking fittings rather than failed sealant
  • Deciding who is responsible under a builder’s warranty
  • Cracking that points to a structural problem

If you are not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer.

Where we work in Dartford

  • Skirting & floors
  • Bathrooms & en suites
  • Plot handovers
  • Kitchens
  • Windows & doors
  • Show homes

Questions from Dartford

Do you work for landlords with property near Dartford station?

Yes, rental work is part of what we do. You can phone 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before we start.

Is new build mastic in Dartford guaranteed?

All our work, in Dartford and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.

How long will you be here?

It depends on the size of the job, but most jobs take a few hours for most snagging lists, longer for a run of plots. We will give you a better idea when we quote.

What sealant do you use?

It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.

Do you work in Dartford?

We do. Dartford is part of the area we cover.

Who should fix failed sealant in a new build?

If you are still within the builder’s snagging or warranty period, report it to them first. If it is not sorted, or keeps failing, get in touch with us.

Do the sealants smell?

Sometimes, a little. Any smell clears as the sealant cures.

Can I do it myself?

For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.

How it works

We bring everything the job needs with us. After a quick look at the joints together, the area is protected and the work begins. It normally takes a few hours in a single home. In Dartford, parking is rarely complicated, though it helps to know about driveways or restrictions, and mention if the work is upstairs, in a flat or high on the outside.

  1. First we work through your snagging list or plot schedule with you.
  2. The old bead comes out in full, with no layer left behind.
  3. Surfaces are cleaned of building dust and primed where needed.
  4. A sealant chosen for each area goes in and is tooled smooth.
  5. We check every joint and tell you how long each needs to cure.

Getting ready for the visit

  • Mention if the joints have been sealed before
  • Mention any leaks or damp you’ve noticed
  • For indoor joints, keep the area dry beforehand if you can

Getting a quote

Getting a quote is simple: let us know the job and the location. A few pictures by email make the job easier to understand, and we will take it from there.

Ask for a quote

Read more

Aftercare tips

Joint life depends on how it’s used and looked after. Here’s what we suggest:

  • Watch for new gaps as the house dries out
  • Avoid scourers and strong chemicals on sealant
  • Don’t wait for the house to settle if water is getting through
  • Open a window or run the fan after bathing

Don’t stand on the bath edge or the lip of the tray. If a bath or tray moves when you stand in it, get it looked at.

Report failed sealant to the builder while you are in the snagging period. After that, putting it right may fall to you, so raise it early.

New build mastic around Dartford

London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.

If you’ve bought a new home near Dartford station, the sealant around baths, showers and frames is worth checking in the first year or two. Around Dartford, as everywhere, new build mastic is only as good as the preparation behind it.

Dartford is about 14 miles east of London, in Kent. Anywhere in DA1, we cover new build mastic for homes and businesses. Dartford is one of 922 towns and villages in Kent we cover. There’s also a page for London, about 14 miles away.

Jobs for new build mastic in DA1, DA2, DA5 and DA13 is quoted and booked the same way as anywhere else. New build mastic is available to properties on High Street, Market Street and Temple Hill Square. Dartford sits on or near the A2 and A206, so getting to you is simple. Nearby, we also carry out new build mastic in Temple Hill (1 mile north), Hawley (1 mile south), Stone (2 miles east), Clement Street (2 miles south) and Darenth (2 miles south-east). We also work in nearby towns such as Sevenoaks (11 miles south), Gravesend (7 miles east), Northfleet (5 miles east), Swanley (4 miles south-west), Kings Hill (14 miles south-east) and Swanscombe (3 miles east). Dartford is among the bigger towns we cover in Kent.

Landmarks near Dartford

We work in homes and buildings around The Rose pub, Stone Lodge School and Leigh Academy and the streets around them. There’s a railway station in Dartford itself: Dartford station. Well-known places in the area include Dartford Library (less than half a mile west) and Bluewater (2.1 miles east). Open spaces near Dartford include Wansunt Pit and Sawyers Lake.

Map of Dartford © OpenStreetMap contributors
20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job