The Mastic Doctor team standing beside their branded vans outside an office building
Oxfordshire · England

Construction and new-build mastic in Clanfield, Oxfordshire

Work needed on a mastic package in Clanfield? We assess it, carry out the work and guarantee our workmanship for 12 months.

  • Frame gaps too wide for sealant alone
  • Old sealant on a refurbishment that needs stripping before new work
  • Snag items on joints that need redoing before handover
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
One fixed quote covering the agreed scope.
3
We seal
Prepared joints, the specified product, a tidy finish.
4
Guaranteed
Our workmanship is guaranteed for 12 months.
Covering the South East & Scotland
CHAS accredited
£5m public liability

Need construction mastic in Clanfield?

Photos, a specification or a quick description of the joints is enough to start a fixed quote.

Diagnose, treat, sign off

Where the site stays busy, we agree a sequence with your contact so the disruption stays in one area at once. Each area is protected, prepared and sealed, then reopened once the sealant allows before the next one starts. Smaller jobs around Clanfield can be grouped with others nearby, which keeps travel down. You will have a fixed quote before work starts.

  1. Drawings, specification and programme come to us.
  2. We take off quantities and return a fixed quote.
  3. The sequence is agreed with the site manager.
  4. Plots or floors are sealed as they’re handed over.
  5. Joints are prepared, backed and sealed to the specification.
  6. After snagging, the work is handed over under our 12-month guarantee.

Getting the site ready

  • Send your site hours and access windows
  • Tell staff and tenants when we will be in
  • Flag any permit to work we’ll need

Request a quote

Let us know the site, the scope and your timescale, and a fixed quote will follow. The easiest way is to call the office on 01277 525 020 or use the quote form.

Ask for a quote

Related advice

About our construction mastic in Clanfield

Perimeter sealing outside needs a dry joint and the right temperature. Cold or damp mornings, frost and condensation on frames can all hold external sealing up, so we plan elevations with the forecast and the programme in mind. Internal sealing often fills those days. We work on sanitary and kitchen joints, internal decorators’ caulk and window and door perimeters, and the failures we’re asked to look at most are different trades sealing to different standards and perimeter gaps outside the sealant’s range. Facilities teams, main contractors and managing agents in Clanfield tend to want the same three things: a fixed quote, no surprises on site and a 12-month guarantee behind the result.

Around smaller places like Clanfield, building work usually means conversions of farm buildings, a few new houses or an extension to a hall or school. Perimeters, facade joints and internal sealant all need doing properly, however small the scheme.

Guaranteed is the last step of every job. Our workmanship is backed for 12 months, and the quote explains what it covers.

Location
Clanfield (OX18)
Wider area
Oxfordshire
Cover
A 12-month guarantee
Price
A fixed quote before we start
Telephone
01277 525 020
Last updated
3 November 2026
The Mastic Doctor team beside their liveried vans in front of an office building

Doing it in-house

There’s also the paperwork. Many sites expect CSCS cards, RAMS and proof of insurance, and our CSCS-carded applicators are used to working under those rules.

A short, simple internal joint is often within reach of a maintenance team. Where it goes wrong is preparation: new sealant over old, damp or dusty faces, or the wrong product for the movement.

What we are called out for in Clanfield

Most mastic snags on new buildings come from sequencing rather than product. Sealing before decorators, flooring or other trades have finished leaves joints exposed to damage, so they end up back on the snag list.

Most enquiries start with something like this:

  • Bath and shower joints scraped during the final clean
  • Cracks opening in caulked internal joints
  • Perimeter gaps outside the sealant’s range
  • External joints sealed in damp or cold conditions that are now failing

Hotels like Plough Hotel (less than half a mile north of Clanfield) rarely close for long, so refurbishment mastic is phased floor by floor.

What your quote should include

  • Will CSCS-carded applicators be on site?
  • How they handle RAMS and site documents
  • What level of public liability insurance do they hold?
  • Their approach to joint depth and backing

How to choose a sealant contractor

What sealant work can’t fix

A few problems need another trade or a different fix, and we say so rather than covering them up:

  • Fire-stopping design or sign-off (that’s for the designer, fire engineer and building control)
  • Designing joint widths or choosing the specification (that sits with the designer)
  • Joints damaged after sign-off by following trades

Not sure which it is? You can ring 01277 525 020 or email a schedule or drawings and we will tell you honestly.

Surfaces we seal

  • Internal decorators’ caulk
  • Cladding and panel joints
  • Floor and skirting junctions
  • Window and door perimeters
  • Brick and block movement joints
  • Sanitary and kitchen joints

What the job involves on each surface

External facade and movement joints

Brickwork, blockwork and panel movement joints need a sealant with the right movement capability. Depth is controlled with backing rod so the bead bonds to two sides only.

Window and door perimeters

Internal perimeters are normally sealed with a paintable product where decorating follows. The specification decides which with colours matched to the frame where needed.

Mastic packages on Clanfield sites

The South East is one of the drier parts of the UK. Still, external mastic needs dry faces within the maker’s temperature limits, which isn’t every day, which is why external dates are agreed with the site manager. There are several hotels within about 2 miles of Clanfield. When hotels extend or refit, the work is usually squeezed between peak periods, mastic included.

When a school such as Clanfield CofE Primary School is extended or refurbished, the mastic package is often squeezed into the holidays. New units and refits on sites such as Bampton Business Centre (South) (1.6 miles east of Clanfield) need their panel and perimeter joints sealed to the specification.

Clanfield is about 4 miles south of Carterton, in Oxfordshire. Clanfield sits inside our coverage and the rest of Oxfordshire, and jobs here get the same fixed quote and 12-month guarantee as anywhere else. We work across 423 places in Oxfordshire, large and small. For work in that direction, see our Oxford page.

Business premises anywhere in OX18 are within our area. Streets here include Main Street, Wicks Close and Mill Lane. We also cover Weald (2 miles east), Black Bourton (2 miles north), Bampton (2 miles north-east), Carterton (4 miles north) and Aston (4 miles east) for mastic packages. Further afield, our area takes in Abingdon-on-Thames (13 miles east), Witney (7 miles north-east), Wantage (11 miles south-east), Grove (10 miles south-east), Faringdon (4 miles south) and Kidlington (15 miles north-east).

Near you in Clanfield

Recent enquiries here include premises near Mason's Arms and the streets around them. Nearby you’ll also find Longworth Hospital (3.8 miles south) and Radcot Castle (1.4 miles south). The countryside around Clanfield includes Badbury Hill.

Map of Clanfield © OpenStreetMap contributors

Building owners, agents and FMs in Clanfield

For main contractors, we work as the sealant subcontractor. Programme, specification and site rules come first.

Housing associations and managing agents often need work done across blocks and communal areas. We phase the work so people keep access, with each stage agreed with your site contact.

Your questions answered

Do you take on work at healthcare sites like Longworth Hospital?

Yes, healthcare and care buildings are part of our work. Work is phased so departments keep running, under the site’s own rules.

Is Clanfield off your patch?

Not at all: smaller places are covered as well as towns. London and every South East county are within our area. Where we can, we group nearby jobs to make the most of each trip.

Do you need to see the site first?

That depends on the size and complexity of the job. Simple work can often be priced from photographs, while larger or less clear jobs get a site visit first.

How do you work with the site programme?

We seal plot by plot or floor by floor as areas are released. The sequence is settled with your site team and updated as the programme moves.

Can you work to our specification?

Yes. We follow the specification, along with the manufacturer’s installation guidance, and any queries are raised before we start.

What does a mastic package typically include?

External and internal frame perimeters, caulking where it’s specified, sanitary silicone, kitchen joints and snagging before handover. We price to the specification and drawings.

How many days will you need on site?

We plan the time on site around your programme and access. We’ll give you an estimate of time on site when we quote.

Accreditations

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