Oxfordshire · England
New Build Mastic in Northmoor
Professional new build mastic in and around Northmoor, with old sealant always removed completely and a one-year guarantee.
- Sealant work across a run of new homes
- Gaps between new skirting and floors
- Frame joints opening as the plaster dries
Common problems we fix in Northmoor
Fresh sealant can be knocked or cut by trades finishing off. If it’s disturbed before curing, the joint can be left weak and it shows once the home is in use.
Keep an eye out for these signs:
- New-build shower sealant that has already split
- Beads laid onto grit and dust from the build
- Kitchen sealant that has pulled off the wall
- Gaps between new skirting and floors
In and around Northmoor, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Before booking anyone
- Which colour the sealant will be
- What the cure time is
- Whether the sealant suits the joint
- How much experience the applicator has
New build mastic for homes and businesses in Northmoor
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. We work on bathrooms & en suites, skirting & floors and kitchens, and the jobs we see most are shower seals failing in the first year or two and second-fix sealing on new plots.
In a village or hamlet like Northmoor, new homes are more likely to be a barn conversion or a handful of houses than a big estate. Every one needs its sealant and floor joints done properly, whatever the size of the site.
Big or small, it’s backed by our 12-month guarantee.
- Location
- Northmoor (OX29)
- Region
- Oxfordshire
- Cover
- One year on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How to look after the new joints
How long the joints last depends on use and care. Here’s what we suggest:
- Act quickly if a seal starts to leak
- Use the extractor fan every time you shower
- Keep pictures and emails about snagging items
- Follow the cure time we give you
Leave the sealant for the cure time we give you before showering or bathing. Silicone is generally left for about a day.
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.
What we can’t put right
We’d rather tell you now than do work that will not last, so these are the limits:
- A tray or bath that is not properly supported, until it’s fixed
- Broken tiles or a split tray
- Your warranty claim itself, which is between you and the builder
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly.
Surfaces we seal
- Windows & doors
- Show homes
- Bathrooms & en suites
- Skirting & floors
- Plot handovers
- Kitchens
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Your questions about new build mastic in Northmoor
Will you come out to Northmoor?
Yes, Northmoor is covered. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Is there a guarantee on new build mastic in Northmoor?
Every job comes with our one-year guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
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.
Do you take on second-fix sealing for builders?
Yes. We carry out plot mastic and second-fix sealing for builders and developers. Send us the plot schedule and we will quote.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we’ll tell you what we’re using.
Where do you work from?
Mr Mastic is based in Crawley. Our applicators cover Northmoor.
How much does new build mastic cost in Northmoor?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before work begins.
Is it normal for sealant to crack in a new home?
It’s common, and there are normally two reasons: the house moving as it dries, and sealant that never bonded properly. A proper reseal deals with both.
Nearby places to Northmoor
Also in Northmoor
What we do, step by step
Once we’re on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take a few hours in a single home. In a small place like Northmoor, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We go through the snagging list or plot schedule and agree the joints to do.
- Failed or untidy sealant is cut out completely.
- Each joint is cleaned of dust and grit, then primed if required.
- We apply a sealant that suits each joint and tool it to a neat finish.
- Each area is checked and left with its cure time.
Getting ready for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Move anything stored near the joints
- Let us know about stairs, lifts or work at height
How to get a quote
There’s no standard price list, because every job is different. Instead, we send you a clear quote for your job. To get started, ring 0345 464 0079 or email us.
Advice
New build mastic in Northmoor: local notes
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.
For jobs in and around Northmoor, choosing the right material for each joint is as important as a tidy finish.
Northmoor is about 6 miles north-west of Abingdon-on-Thames, in Oxfordshire. We provide new build mastic to homes and businesses in Northmoor and the surrounding area, as part of our work across Oxfordshire. 443 places in Oxfordshire are on our list, from the larger towns to small villages. You can also see our page for Oxford, about 7 miles away.
Every address in OX29 is covered for new build mastic. We cover properties on Chapel Lane and Bints Place. We also cover Appleton (2 miles south-east), Sutton (2 miles north), Cumnor (3 miles east), Filchampstead (3 miles north-east) and Farmoor (3 miles north-east). Within a short drive, we also cover Oxford (7 miles east), Didcot (10 miles south-east), Abingdon-on-Thames (6 miles south-east), Witney (6 miles north-west), Carterton (9 miles west) and Wantage (9 miles south).
What’s near Northmoor
In Northmoor, that means homes and buildings near The Red Lion Public House. Well-known places in the area include Abingdon Community Hospital (5.4 miles south-east) and Hinton Waldrist Castle (3.7 miles south-west). Not far away are Hitchcopse Pit and Cumnor Hill.
Landlord and commercial work in Northmoor
Letting agents often deal with us directly. Tell us the address, the job and how access works.
We also work for property managers and facilities teams. Several sites can go on one quote, and we’re fully insured.
Different surfaces, different methods
Windows and doors
On new builds, external frame sealant can be patchy. It’s resealed with an exterior sealant suited to the frame and wall.
Skirting and floors
Where the floor meets a bath panel or kitchen plinth, the joint keeps mop water out. They get a flexible, water-resistant sealant.