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

Lewes facade sealing

Facade joint and window perimeter sealing on commercial buildings in Lewes. CHAS accredited and fully insured, with a 12-month guarantee.

  • Old perimeter mastic that has dried out
  • Failed sealant on precast panel joints
  • Water coming in around window frames
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
The right sealant, to the right depth, neatly finished.
4
Guaranteed
Our workmanship is guaranteed for 12 months.
South East, London & Scotland
CHAS & Constructionline
£5m public liability

Facade sealing across Lewes

Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.

About our facade sealing in Lewes

Water ingress at window frames is a frequent reason facilities managers contact us. Failed perimeter sealant is a frequent cause. If the evidence points away from the sealant, we say so before quoting. We work on cladding panel joints, window and door perimeters and stone and brick facade joints, and the usual reasons a site gets in touch are staining on stone next to old sealant and facade joints cracked through the middle. For commercial sealant work in Lewes, you deal with one contact from quote to sign-off, whether it’s one building or several.

For contractors on site in a town like Lewes, the mastic has to fit the programme: perimeters sealed before scaffold is struck, internal sealant after decoration, snags before handover. Tell us the programme and we will quote to it.

Guaranteed is the last step of every job. You get a 12-month guarantee on our workmanship, and we explain exactly what that covers when we quote.

The Mastic Doctor team beside their liveried vans in front of an office building
Place
Lewes (BN7, BN8, BN6, RH15)
Region
East Sussex
Guarantee
12 months on our workmanship
Price
A fixed quote before we start
Phone
01277 525 020
Updated
3 November 2026

Maintenance after handover

Keep the joints in good shape with a few simple steps:

  • Confirm the survey covers external sealants in older buildings
  • Keep the sealant details on the building file
  • Add perimeter sealant to planned maintenance checks
  • Don’t wait for a second leak before calling

After heavy weather, check vulnerable elevations for signs of water inside. An early report typically means a small reseal rather than a bigger repair.

Don’t wait for a full elevation to fail. Small repairs stop small leaks becoming large ones behind the facade.

Do you need facade sealing in Lewes?

A frequent fault is a bead stuck to the joint’s rear face as well as its sides. With no backing, the sealant is restrained and rips when the facade moves.

If one of these sounds familiar, it’s time for a closer look:

  • Failed seals around shopfront and entrance frames
  • Failed sealant on precast panel joints
  • Water coming in around window frames
  • Draughts around frames and panels

University estates such as University of Sussex, 4 miles to the west of Lewes, tend to have a rolling programme of new buildings and refurbishments, each with window perimeters and facade joints to seal.

What your quote should include

  • How the joint faces will be prepared and primed
  • Their approach to joint depth and backing
  • Whether their applicators hold CSCS cards
  • Their plan for phasing and protecting the area

Questions to ask before you appoint anyone

Diagnose, treat, sign off

We follow your site rules from the start: sign-in, induction and whatever permit system the building uses. Once we are cleared to begin, we take the joints in the sequence agreed with you, and each area is checked before we leave it. Parking and loading for town-centre jobs in Lewes are worth mentioning when you send details. On estates and business parks it’s normally simpler.

  1. We start with photographs, drawings or a visit to see the joints and agree access.
  2. We confirm the joint type, movement and the specified product.
  3. Failed beads are removed in full.
  4. Primer is applied where the maker specifies it.
  5. Backing rod is fitted and the new sealant gunned in and tooled.
  6. The finished joints are checked with you.

Before we start on site

  • Agree which areas must stay open
  • Move anything stored against the joints
  • Tell staff and tenants when we will be in

Quotes

Specifications, drawings and tender packages are welcome with any enquiry, and we’ll price the work to it. Smaller jobs need nothing more than photographs and a few notes.

Ask for a quote

Advice

What sets the cost

Your fixed quote is built from the real scope. It allows for:

  • Any access equipment needed
  • Whether old sealant has to be cut out first
  • The size and state of each joint
  • Site requirements such as inductions and permits

There’s no price list, since every building and every scope is different. Call for a quote and we will price your job on its own details.

What we need to price the job

A good diagnosis starts with the right details. Tell us:

  • Rough lengths or quantities, or drawings if you have them
  • Whether the building will be occupied during the work
  • The site address and postcode
  • Whether an asbestos survey exists

Tell us about the building, the joints and when you need the work done, and we’ll put a fixed quote together. To get it moving, call 01277 525 020 or send photos by email.

Common questions from Lewes clients

Does your area include sites such as Riverside Industrial Estate, near Lewes?

Yes. Our area takes in Lewes and its surroundings, with estates and business parks such as Riverside Industrial Estate included. A few photos and the unit address let us price the work.

Will you plan work around the academic year at somewhere like University of Sussex?

Yes. Tell us the term dates, vacation periods and access windows, and we will plan the work around them. We are CHAS accredited and a Constructionline member, and paperwork such as RAMS is confirmed with the quote.

Can you send site paperwork?

Each site asks for different documents, so tell us what you need and we will confirm it when we quote.

Should we check old sealant for asbestos?

Some older mastics, especially in pre-2000 buildings, can contain asbestos. Check the asbestos register or survey before it is disturbed. We don’t remove asbestos-containing materials.

Do you guarantee your work?

Yes, for 12 months. If our installation fails in that time, we return and fix it.

Can you look at water coming in around a frame?

Yes. We look at the perimeter sealant and tell you whether it has failed as part of pricing. If the water seems to come from a roof, sill or the glazing unit instead, we say so.

Can you fit around our working hours?

We’re in the office from 8am until 5pm, Monday to Friday. Tell us your site hours and access windows and the work will be fitted around them.

Contractors’ notes for Lewes

Lewes sits in one of the drier corners of the country, the South East. 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. Lewes lies roughly 43 miles out from central London. Building activity in the commuter belt runs from new flats near stations to business park refurbishments, which keeps mastic packages in demand.

When a college such as East Sussex College, 0.7 miles south-east of Lewes, builds or refurbishes, the mastic package typically has to fit around students and staff. For contractors refurbishing units at places like Riverside Industrial Estate (less than half a mile east of Lewes), the mastic covers cladding panels, roller-door and window perimeters.

Lewes is about 7 miles north-east of Brighton, in East Sussex. Any commercial site in Lewes is covered, whether it’s a single job or part of a planned programme. 308 places across East Sussex fall within our area, including Lewes. Our Brighton page has more on work in that area, about 7 miles away.

Commercial sites across BN7, BN8, BN6 and RH15 are covered for facade joints. Among the streets we cover are Market Lane, Market Street and High Street, and sites on any of them can send details for a fixed quote. Main routes into Lewes include the A26 and A275, useful when we plan access and materials. We also cover South Malling (1 mile north-east), Southover (1 mile south-east), Cliffe (1 mile east), Offham (1 mile north-west) and Hamsey (1 mile north). Further afield, our area takes in Eastbourne (14 miles south-east), Seaford (8 miles south-east), Hailsham (11 miles east), Crowborough (14 miles north-east), Uckfield (8 miles north-east) and Newhaven (6 miles south). Lewes ranks among the main centres of East Sussex, with offices, shops, schools and other public and commercial buildings.

Local landmarks in Lewes

We work on buildings around Priory School, St Pancras Catholic Primary School and Railway Land and the streets around them. Lewes’s nearest station is Lewes station, about 0.6 miles south-east of the centre. A little further out are Lewes Victoria Hospital (0.5 miles west) and Museum of Agricultural Bygones (3.9 miles east). Open spaces near Lewes include Offham Hill and Malling Down.

Map of Lewes © OpenStreetMap contributors

Should maintenance staff do it?

For most general trades, sealant is a sideline. A specialist prepares properly, controls joint depth and picks a product with the right movement class, which is what makes a joint last.

Some joints are best left to specialists: fire-rated seals that must follow a tested detail, trafficked floor joints and external movement joints among them. A poor seal in places like these tends to cost more to put right later.

Why act early in Lewes

Open facade joints also let air and dirt through: draughts around frames add to heating costs and complaints. Resealing deals with the draught as well as the leak. In Lewes, as anywhere, the simplest time to fix a failed joint is before it leaks. After a leak, there’s drying, repairs and redecoration on top.

Access often affects the price as much as the sealing: easy-to-reach joints are quicker than those that need equipment to get to. Mention the access as part of your enquiry.

What you get with us

  • Colour options checked against the specified product
  • Joints cleaned back to sound surfaces
  • Work carried out by CSCS-carded applicators
  • Health and safety: CHAS accredited

Read what affects the cost and our accreditations and insurance.

Accreditations

Trusted. Accredited. Insured.