Essex · England
New-build mastic & snagging in Harwich, Essex
New build mastic across Harwich and nearby, with every bit of old sealant taken out first.
- Smeared, uneven beads picked up at snagging
- Sealant work across a run of new homes
- Leaking shower tray seals in a new home
New build mastic in Harwich, done properly
We never seal over a failed new-build bead. New silicone won’t bond to old silicone, so the joint is cut out, cleaned, dried and resealed. We work on skirting & floors, plot handovers and kitchens, and the jobs we see most are leaking shower tray seals in a new home and gaps opening as the house dries out and settles.
In a town like Harwich, older houses sit alongside newer estates. In a newer home, sealant and floor joints are normally among the first things to need attention.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Where
- Harwich (CO12)
- Wider area
- Essex
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Harwich questions
Can you do new build mastic in Harwich?
Yes, Harwich is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or email us with a few details of the job, and we’ll send you a clear quote.
What guarantee comes with new build mastic in Harwich?
All our work, in Harwich and everywhere else, comes with a 12-month guarantee. We’re also fully insured and ARBOMaster approved.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Can you reseal over the builder’s sealant?
No. Sealing over old sealant looks fine for a few weeks, then lifts. We remove every bit of the old bead before resealing.
Why has my new-build shower seal failed already?
Cracking in the first couple of years is common, because the house is drying and settling. Rushed application on dusty surfaces makes it worse.
Will it make a mess?
Tidy work is part of the job. Nearby surfaces are protected, and we clear up when we’re done.
My new home is still under warranty. Should I contact you?
While the snagging or warranty period runs, the builder should be your first contact. If it is not sorted, or keeps failing, get in touch with us.
Do you work through snagging lists?
Yes. Send us the sealant items on the list, with photos if you can and we’ll give you a quote. We will tell you if anything on it isn’t a sealant job.
Looking after it afterwards
Good habits help new joints last longer. A few tips:
- Keep pictures and emails about snagging items
- Avoid scourers and strong chemicals on sealant
- Open a window or run the fan after bathing
- Check bath and shower seals every few months as the house settles
Clean the sealant with a mild detergent and a soft cloth. Keep scourers and harsh chemicals off it.
Leave a failed new-build seal and water can reach the floor and the ceiling below. Early resealing keeps the job small.
The process
We bring everything the job needs with us, so there’s nothing for you to buy. Once we have agreed what’s being done, we protect the area and start. Most jobs take anything from a few hours to several days, depending on the number of plots. A visit in Harwich needs access to the work and a place to park close by. If the job is outside, mention gates, side access and anything above ground floor.
- 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.
How to prepare
- Let us know about parking restrictions
- Mention any leaks or damp you’ve noticed
- Try not to wet indoor joints just before the visit
Get a quote
Getting a quote is simple: tell us what needs doing and where and its rough size. A few pictures by email make the job easier to understand.
Read more
What happens if it’s left?
Sealant done properly at handover means fewer callbacks. Every return visit for a failed seal takes time. Gaps in sealant and mould in the bead never get better on their own, and in a busy household in Harwich they spread with every shower and every downpour. Replacing the sealant now is the simplest fix.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, ring 0345 464 0079 or email us and we will give you an honest view and a quote.
What you get with us
- 4.9 on Google from 180+ five-star reviews
- Quality sealants from Arbo and Everbuild
- 12-month guarantee on every job
- We never seal over old sealant
Towns and villages near Harwich
Also in Harwich
Joints and finishes in Harwich homes
Harwich is within about 1 mile of the coast. Plot mastic on new homes near the coast takes more weather than it would inland, so any gaps are best picked up early. 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.
For new homes near Dovercourt station, it’s worth checking the sealant early, while snags are still fresh. In and around Harwich, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Harwich is in Essex. If you need new build mastic in Harwich, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We cover Essex from our Crawley base, Harwich included. Our area takes in 644 places across Essex, from the larger towns to small villages. Our Chelmsford page covers work nearby.
Postcode districts we cover here for new build mastic: CO12. New build mastic is available to properties on Station Road, High Street and Market Street and the roads around them. You will find Harwich on the A120 and B1352, which makes it straightforward to reach. Neighbouring places we cover for new build mastic include Parkeston (1 mile north-west), Little Oakley (2 miles south-west) and Ramsey (2 miles west). Further out, we also cover Clacton-on-Sea (10 miles south-west), Greenstead (14 miles west), Wivenhoe (14 miles west), Brightlingsea (13 miles south-west), Walton-on-the-Naze (6 miles south) and Bocking's Elm (11 miles south-west).
Around Harwich
Around Harwich, our work takes us to homes and buildings near St Joseph's Catholic Primary School and The Trafalgar Public House and the streets around them. For rail, the closest station is Dovercourt station, about 0.9 miles north-east of the centre. Other landmarks nearby include Landguard Fort (2.5 miles east) and Harwich Museum (1.3 miles north-east). Open spaces near Harwich include Copperas Wood.
What affects the quote in Harwich
Call for a quick quote. What matters most is:
- Access and height
- The product the joint needs
- The old material and how stubborn it is
- Whether there’s mould to deal with
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. You’ll know the price before we begin.
What to tell us for a quote
What to tell us when you ask for a quote:
- Any previous sealing or DIY work
- How many joints, rooms or windows are involved
- A few pictures by email, if you can
- The type of property
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
Different surfaces, different methods
Windows and doors
On new builds, external frame sealant can be patchy. We reseal it with a weatherproof, flexible sealant.
Plot handovers
Good preparation at handover saves snagging later. We clean out building dust before sealing and primer used where needed.
Should I try it myself first?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Honest limits
Sealant isn’t the answer to every problem, and we’d rather say so up front. It will not solve:
- Deciding who is responsible under a builder’s warranty
- Cracked trays, tiles or worktops
- Baths and trays that move too much for sealant to cope with
If you’re not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer.
What we seal
- Skirting & floors
- Kitchens
- Windows & doors
- Show homes
- Plot handovers
- Bathrooms & en suites