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

Facade Sealing contractors in Cumnor

Commercial sealant work in Cumnor for contractors, FMs and building owners: facade joint and window perimeter sealing on commercial buildings, quoted at a fixed price.

  • Leaks at window and door perimeters
  • Unsightly perimeter sealant on a visible elevation
  • Cold air coming in at window perimeters
1
Send details
Photos, drawings or a schedule, or we 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
Signed off, with 12 months’ guarantee.
London, the South East & Scotland
CHAS & Constructionline
£5m PL insurance

Facade sealing across Cumnor

Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.

How we handle facade sealing in Cumnor

Facade sealants sit in the sun, rain and frost every day, so they don’t last indefinitely. Life depends on movement, weathering, product choice and the quality of the original work. When the time comes, we cut the old sealant out completely and start again. If you have patch repairs that keep failing and cold air coming in at window perimeters, we can put it right, whatever the surface. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: in Cumnor, that means joint design, primers and backing rod as standard.

Construction in and around smaller places such as Cumnor is often barn conversions, small groups of houses or extensions to halls and schools. Perimeters, facade joints and internal sealant all need doing properly, however small the scheme.

Our 12-month guarantee is about workmanship, not wear and tear. How long a sealant joint lasts depends on movement, exposure, cleaning and use, so we spell out the cover before we begin.

Where
Cumnor (OX2)
Region
Oxfordshire
Cover
A 12-month guarantee
Price
Quoted before any work starts
Phone
01277 525 020
Page updated
3 November 2026
Mastic Doctor team members lined up next to their branded vans outside an office building

Diagnose, treat, sign off

Diagnose, treat, sign off: that’s the shape of every visit. We inspect the joints and confirm what’s in scope, then we prepare and seal each joint with the specified product, and the job ends with a walk round and sign-off. If others near Cumnor need work, visits can be combined. A fixed quote is given before anything starts.

  1. Photos, drawings or a visit tell us about the joints and the access.
  2. We confirm the joint type, movement and the specified product.
  3. The existing bead comes out in full and the joint faces cleaned.
  4. Primer is applied where the maker specifies it.
  5. Rod goes in to fix the depth, then the joint is sealed and tooled.
  6. The finished joints are checked with you.

Getting the site ready

  • Send any specification or drawings in advance
  • Explain the parking and delivery arrangements
  • Let building users know which areas are affected

Getting a fixed quote

The quickest route to a quote is a few photos and the site postcode. Upload them with the quote form, or give us a call on 01277 525 020 or email a schedule or drawings to discuss it first.

Ask for a quote

Advice

Cumnor: questions and answers

Can you work around term dates at a campus such as Azad University in Oxford?

Yes. We plan campus work around teaching, exams and residence turnarounds. Any paperwork you need, from RAMS to our insurance certificate and CSCS details, is confirmed with the quote.

Is Wootton Business Park, near Cumnor, within your area?

Yes, sites like Wootton Business Park are within our area, along with the rest of Cumnor. Send details of the unit and the work through our quote form for a quick quote.

Can the sealant be colour-matched?

In many cases, yes. Sealants are made in a wide range of standard colours, and matching to RAL references or nearby finishes is commonly requested. We’ll confirm the colours available for the specified product.

Do you need to see the site first?

It depends on the job. Straightforward work can often be priced from photos and measurements, and bigger or more complex jobs typically get a visit.

Do you seal on top of existing sealant?

No. Overlaying old sealant is a frequent cause of early failure, so everything comes out first.

Can you work while the building is occupied?

In most cases, yes. We phase the work so most of the building stays in use.

Can you find out why a window is leaking?

Yes. Photos are often enough to start, followed by a visit if needed. Failed perimeter sealant is a common cause, but not the only one, and we’ll tell you which.

How the quote is worked out

There’s no standard rate for sealant work, since sites vary so much. What we look at:

  • How much there is to seal
  • Travel to remote or island sites
  • Phasing around occupants
  • Backing rod, priming and other preparation

The product called for affects the cost, as does the preparation each joint needs. Access, phasing and site requirements come into it too.

What to include in your enquiry

We can often quote from photographs and a few details. Please tell us:

  • Specification clauses that apply
  • Where the site is, with the postcode
  • Whether the building will be occupied during the work
  • Rough lengths or quantities, or drawings if you have them

For a fixed quote, speak to us on 01277 525 020 or send details through our quote form, telling us the site location and the nature of the job. Our quote form is another easy route.

Different surfaces, different methods

Brick and stone facades

Joints in natural stone need care to avoid staining. The specified stone-compatible sealant is what we use, with masked edges for a clean line.

Perimeter joints at frames and structure

Perimeter joints at frames often show their age first. They are cut out, cleaned, backed and resealed using a sealant classified for that use.

Commercial clients in Cumnor

Hospitality, education, healthcare, office and retail clients come to us directly as well. The work is planned around how the building runs, so the building keeps working while we do.

Whether you’re a managing agent, a property factor or an owner’s representative: send the details, accept a fixed quote, and we carry out and guarantee the work. Keys, access and contacts can be agreed in advance.

After the work

Once the work is signed off, these steps help:

  • Keep the sealant details on the building file
  • Insist on a full cut-out when joints are renewed
  • Confirm the survey covers external sealants in older buildings
  • Don’t wait for a second leak before calling

Look at perimeter and panel joints as part of routine building checks. Watch for splits, gaps at the edges, hardening and discolouration.

Building facade joints into a maintenance cycle avoids emergency repairs. Inspect regularly and reseal sections as they start to fail instead of after the damage.

New build and refits around Cumnor

Cumnor lies roughly 56 miles out from central London. Towns within reach of London tend to keep building, from flats to offices and schools, which keeps mastic packages in demand. Cumnor is in the South East, one of the UK’s drier regions. Even so, frost and condensation on steel and glass are common on winter mornings, so the external programme keeps a little slack.

New units and refits on sites such as Wootton Business Park, 1.7 miles south of Cumnor, need their panel and perimeter joints sealed to the specification. For contractors at a school such as Cumnor Church of England School (Voluntary Controlled), sealing has to be finished before term starts. On a campus such as Azad University in Oxford, which lies north-west of Cumnor, new teaching buildings and residences are usually built and refurbished around the academic year.

Cumnor is about 4 miles north-west of Abingdon-on-Thames, in Oxfordshire. Across the OX2 postcode area, the process is the same: send details, get a fixed quote, we seal, and the work is guaranteed. Cumnor is one of 423 places in Oxfordshire on our list for facade joints.

If you need facade sealing in OX2, the process matches everywhere else we work: send details, get a quote, we seal, guaranteed. If your site is on High Street, The Park and The Winnyards or close by, we can quote for facade joints. Sites close to Cumnor are covered too, including Chawley (1 mile north-east), Filchampstead (1 mile north-west), Henwood (1 mile south-east), Dean Court (2 miles north-east) and Botley (2 miles north-east). Bigger towns within reach include Oxford (5 miles east), Didcot (9 miles south-east), Bicester (14 miles north-east), Abingdon-on-Thames (4 miles south-east), Witney (8 miles north-west) and Carterton (11 miles west).

What’s near Cumnor

Around Cumnor, our work takes us to commercial buildings near The Vine Inn and Matthew Arnold School, among other places. The nearest railway station is Oxford station, roughly 3.1 miles north-east. A little further out are Westgate Shopping Centre (3.3 miles north-east) and Radcliffe Infirmary (3.6 miles north-east). Open spaces near Cumnor include Lashford Lane Fen and Cumnor Hill.

Map of Cumnor © OpenStreetMap contributors

When something else is needed

We check first that sealant really is the fix. It isn’t the answer for:

  • Damaged frames that need replacing
  • Movement beyond what any sealant can handle
  • Damp caused by condensation inside the building

Not sure which it is? You can phone 01277 525 020 or email the details over and we will tell you honestly.

Where we work in Cumnor

  • Cladding panel joints
  • Coping and flashing joints
  • Shopfront frames
  • Perimeter joints where frames meet the structure
  • Stone and brick facade joints
  • Window and door perimeters
Accreditations

Trusted. Accredited. Insured.