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

Facade and window perimeter sealing in Downside, Surrey

Facade sealing for Downside, from a contractor working since 2005. Fully insured and CHAS accredited.

  • Weathered joints at frame-to-structure perimeters
  • Facade joints cracked through the middle
  • Gaps between rainscreen or cladding panels
1
Send details
Photos, drawings or a schedule, or we visit.
2
Get a quote
Scope agreed and priced before anything starts.
3
We seal
CSCS-carded applicators, the right product for each joint.
4
Guaranteed
Signed off, with 12 months’ guarantee.
Covering the South East & Scotland
CHAS accredited
Fully insured: £5m PL

Facade sealing across Downside

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

What the job involves on each surface

Perimeter joints at frames and structure

Where framed systems such as shopfronts meet the building structure, there is a perimeter joint to seal. We seal those perimeter joints, not the framing or glazing itself.

Cladding panel joints

Where panels are sealed rather than open-jointed, the bead is part of the weather line. Failed runs are cut out and rebuilt end to end to the correct depth.

About our facade sealing in Downside

Some clients need every window on a block resealed; others need a few leaking frames sorted. The approach doesn’t change with the size: old sealant out, faces cleaned, depth set and a new bead tooled in. Each job carries our 12-month guarantee. Most enquiries involve cladding panel joints that have opened up and perimeter joints where frames meet the structure, on window and door perimeters, perimeter joints where frames meet the structure and coping and flashing joints. A specialist sealant contractor works differently from a general builder: in Downside, that means joint design, primers and backing rod as standard.

Sites around smaller places like Downside can be a fair drive from suppliers, so we come with everything the package needs. Drawings, photos and the programme let us give a fixed quote.

A 12-month guarantee applies to all our work in Surrey. Should something we installed fail, call 01277 525 020 or use the quote form and we’ll come back to it.

Location
Downside (KT11)
Region
Surrey
Guarantee
12 months on our workmanship
Quotes
Quoted before any work starts
Call
01277 525 020
Updated
3 November 2026
Mastic Doctor team members lined up next to their branded vans outside an office building

Facade sealing around Downside: how the place shapes the job

Rainfall across the South East, Downside included, is lower than in many parts of the UK. That doesn’t stop wet spells, or frosty starts that leave panels too damp to seal, so external mastic is timed for workable conditions and agreed with the site manager. Downside lies roughly 19 miles out from central London. Construction around the commuter belt mixes station-side flats with refurbished offices and units, and main contractors there need mastic that keeps to the programme.

For contractors at a school such as St Matthew's CofE Aided Infant School, sealing has to be finished before term starts. With historic properties like Byfleet Manor (2.7 miles north-west of Downside) in the area, refurbishment work often meets old masonry that needs compatible sealants. On a healthcare site such as Cobham Community Hospital and Health Centre, which lies north of Downside, new blocks and refurbishments go on while the hospital keeps running, so mastic work is sequenced carefully.

Downside is about 4 miles west of Leatherhead, in Surrey. Businesses, contractors and managing agents in Downside use us for work on facade joints, as part of our coverage of Surrey. Our Surrey coverage takes in 379 places. For work in that direction, see our London page (19 miles or so).

Commercial sites across KT11 are covered. Buildings on Downside Common, Downsview Close and Deacon Close are within our area. If your building is just outside Downside, we cover Hatchford (1 mile west), Martyr's Green (1 mile south-west), Hatchford End (2 miles west), Whiteley Village (3 miles north) and Wisley (3 miles west). Nearby towns on our patch include Guildford (8 miles south-west), Woking (7 miles west), Camberley (14 miles west), Epsom (6 miles east), Horley (14 miles south-east) and Redhill (12 miles south-east).

Local landmarks in Downside

In Downside, that means premises near The Plough Public House and Parkside School, among other places. The nearest railway station is Cobham & Stoke Dabernon station, roughly 1 mile north-east of the centre. Well-known places in the area include Epsom Cottage Hospital (5.1 miles north-east) and Send and Ripley History Society Museum (3.8 miles west). Green spaces nearby include Jubilee Wood and Boldermere Lake.

Map of Downside © OpenStreetMap contributors

For managing agents and facilities managers

FMs need a contractor who is easy to get on site. Tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we will confirm with the quote.

As a CHAS accredited contractor and Constructionline member, we make supplier vetting simple. Our insurance certificate can be sent along with the quote.

Diagnose, treat, sign off

Our CSCS-carded applicators arrive with the sealants, primers and backing rod the job calls for. Any old material is cut back to clean, sound faces, the manufacturer’s primer is applied where it’s called for, and each bead is tooled to a neat concave finish. Jobs in and around smaller places like Downside are typically planned as a single visit, so photographs and measurements up front really help. Then the right materials arrive with us.

  1. We look at the joints, the drawings and the access before pricing.
  2. Failed sealant is cut out along its full length.
  3. Both faces are cleaned and, where the product needs it, primed.
  4. Closed-cell rod fixes the depth, and the sealant grips two sides only.
  5. The new sealant goes in and is tooled firmly onto both faces.
  6. We walk the finished joints with you before handing over.

What we need from you

  • Send asbestos survey details if the building is pre-2000
  • Flag any permit to work we will need
  • Have the specification and drawings to hand

Ask for a quote

A good quote starts with a clear picture: what’s there, how much of it, how we reach it and what’s specified. Share whatever details you have and we’ll fill any gaps with a visit.

Get a quick quote

Advice

Why act early in Downside

The longer a failed joint is left, the more the substrate suffers: wet edges break down, so repairs may be needed before resealing. Acting at the first sign of splitting keeps the fix simple. Around Downside, it’s better to renew all the failing joints at once, rather than one at a time. Photos of every joint help us quote for the whole job.

Whether it’s a single area or a whole estate, the same things set the price: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote, and you’ll have a fixed figure to work with.

Why us?

  • Colours chosen to suit frames, cladding or finishes where possible
  • Specification-led, product-correct work
  • Coloured sealants to suit the setting, where available
  • Commercial sealant work since 2005

Take a look at our cost guide or our accreditations and insurance.

When to bring in a specialist

General builders and handymen seal joints, but it isn’t their main trade. A specialist brings correct preparation, depth control with backing rod and a product suited to that particular joint, which is what makes a joint last.

Redoing a failed joint typically costs more than getting it right at the outset, since all of it has to come out and the faces be cleaned back again. For that reason, many FMs and contractors use a sealant specialist from the outset.

Questions we are asked in Downside

Is hospital work, at somewhere like Cobham Community Hospital and Health Centre, something you do?

Yes. We work in healthcare settings as well as offices and schools. We follow the site’s permits, sign-in and infection-control procedures in every area.

Is Bookham Industrial Estate, near Downside, within your area?

Yes. We cover Downside and the area around it, including industrial estates, business parks and retail parks such as Bookham Industrial Estate. To start, just speak to us on 01277 525 020 or email drawings and photos with the unit, the joints involved and your access times.

How many days will you need on site?

That varies with the scale of the job, though a typical visit usually takes longer on a full elevation than on a handful of window perimeters, and it always depends on dry weather. For bigger or phased jobs, we’ll set out a timescale with the quote.

Is it okay to overlay old mastic?

No. New sealant won’t hold on old sealant, so the old bead is cut away. That is what makes the new joint last.

Do you provide access for facade work?

We agree access with the client at the start. Tell us about access: existing scaffold, what you are arranging and any site restrictions, and we’ll price the work around it.

Are you CHAS accredited?

Yes. We’re CHAS accredited and a Constructionline member.

Do you take on small jobs?

Single areas, one-off repairs and whole buildings are all quoted the same way: send details, get a fixed quote, we seal, guaranteed.

Honest limits

A proper diagnosis includes knowing what sealant can’t do. You will hear from us if the cause turns out to be any of the following:

  • Cracked or spalling substrates that need repair before sealing
  • Leaks from roofs, gutters or failed flashings rather than sealant joints
  • Replacing glass or failed glazing units

If you are not sure, just give us a call on 01277 525 020 or send details through our quote form and we will give you a straight answer before you book.

What we seal

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

Trusted. Accredited. Insured.