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RGE Qualibat certified
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Our services

All your roofing work, one team

From a large renovation to a small repair, the same team looks after your roof, from the quote to the end of the job.

Our services

Roof renovation

Full or partial refurbishment of your roof, whatever the material, done to the highest standards and covered by a 10-year warranty.

  • Tiles
  • Slate
  • Zinc
  • Steel sheeting
  • Waterproofing

Flat-roof waterproofing

Flat roofs and terraces sealed for the long term with EPDM or bituminous membranes.

  • EPDM membrane
  • Torch-on bitumen
  • Flat roofs & terraces

Thermal insulation

Up to 30% of heat escapes through the roof: we insulate from outside, with sarking or a thin vapour-permeable insulation, to cut your bills.

  • Sarking: rigid boards over the rafters
  • External insulation, no loss of living space
  • 5.5% VAT & RGE grants

Roof windows

Installation and replacement of Velux & Skylux roof windows, plus dormers and mansard openings.

  • Velux & Skylux
  • Dormers & mansards
  • Guaranteed watertight fit

Custom zinc work

Shaping and fitting of zinc work: gutters, box gutters, valleys and cladding.

  • Workshop-made
  • Gutters & box gutters
  • Bespoke

Repairs

Leak, blown tile, damaged flashing: we repair and restore your roof, cleanly.

  • Leak detection
  • Lasting repair
  • Clear quote

Moss removal & upkeep

Cleaning, moss removal and water-repellent treatment to extend your roof’s life.

  • Moss removal
  • Water-repellent treatment
  • Maintenance plan

Inspection & assessment

Unsure about your roof’s condition? We give you a clear assessment before any commitment.

  • Full inspection
  • Report & advice
  • Transparent quote

Under your tiles

What we lay, layer by layer

A renovated roof is much more than tiles. Here is a tiled roof insulated from outside with sarking: turn it to see every layer, from the rafters to the gutter.

Drag to rotate

  1. Rafters The timber rafters carry the whole roof. We check their condition before covering them.
  2. Vapour barrier A membrane laid over the rafters, under the insulation: it stops moisture from the house getting into the insulation.
  3. External insulation (sarking) Rigid insulation boards laid continuously over the rafters: the most effective method, with no loss of attic space. Eligible for grants, subject to conditions, thanks to our RGE certification.
  4. Roofing underlay A membrane that keeps the timber dry, during the works and for years afterwards.
  5. Counter-battens and battens Timber strips that let air flow under the tiles and hold them in place.
  6. Clay tiles The part you see: Postel 20 tiles by BMI Monier, suited to the local climate.
  7. Zinc work Gutters and zinc parts made to measure in our workshop to carry rainwater away.

Slate, zinc, steel sheeting or flat roof: each type of roof is built differently. During the free visit, we explain the build-up that suits your roof.

Work out how well the insulation performs

Pick the insulation and its thickness: the simulator gives the thermal resistance you get and tells you whether it meets the threshold required for grants on pitched-roof insulation.

Open the full roof simulator

Unilin Utherm Sarking K board · λ 0.022 W/m·K

140 mm

Thermal resistance R 6.45m²·K/W

Roof U-value 0.15W/m²·K

Meets the threshold required for pitched-roof insulation grants (R ≥ 6 m²·K/W). See the available grants

Ask for a quote for this insulation

Indicative estimate: thicknesses and thermal resistances declared by the manufacturers of commercially available sarking boards (Unilin Utherm Sarking K polyurethane, Utherm Sarking L Comfort combined board, ACERMI-certified wood fibre); roof U-value worked out with the EN ISO 6946 method, under a ventilated roof covering. The exact build-up is set during the free visit.

Our commitments

Why trust us?

  • Every type of roof

    Tiles, slate, zinc, steel sheeting, EPDM

    Clay or concrete tiles, slate, zinc, steel sheeting, bitumen or EPDM membranes: we master every covering.

  • 10-year warranty

    Insured with SMA BTP

    Laying or renovating a roof falls under the 10-year building warranty: our SMA BTP insurance protects you.

  • RGE Qualibat certified

    Since 2025

    Your insulation and energy-renovation work may qualify for grants, subject to conditions: details just below.

  • Qualified teams

    Trained roofers and zinc workers

    Every job is led by qualified roofers with more than 10 years of experience, regularly trained in safety and building rules.

  • Branded materials

    BMI Monier, Velux, Skylux, Unilin…

    Postel 20 tiles by BMI Monier suited to the region, Velux or Skylux roof windows, Unilin, Actis or Recticel insulation: built to last.

  • Free quote

    Within 48 working hours

    A tailored estimate, free and with no obligation, for laying or renovating your roof.

RGE Qualibat certified: your work can qualify for grants

Because CMT Toiture is Reconnu Garant de l’Environnement, your energy-renovation work (insulation, refurbishment) may qualify for MaPrimeRénov’, MaPrimeRénov’ Copropriété, CEE, éco-PTZ, éco-PTZ for co-ownerships, 5.5% reduced VAT, property tax reduction, subject to conditions. We guide you to the schemes that fit your situation.

Estimate my project

Frequently asked

We answer

Is my project eligible for grants?

Yes. CMT Toiture is RGE Qualibat certified, so your insulation and energy-renovation work can qualify for MaPrimeRénov’, CEE certificates and the éco-PTZ loan, subject to conditions.

What area do you cover?

The whole Lille metropolitan area and nearby towns: Lille, Ronchin, Villeneuve-d’Ascq, Lambersart, Marcq-en-Barœul and surrounding communes.

Is the quote really free?

Yes, the quote is free and with no obligation. We come out to assess your roof and send you a detailed proposal, usually within 48 hours.

Do I need permission from the town hall?

Yes, as soon as the exterior changes (different material, external insulation, new roof window, altered roof frame): the owner files a prior declaration (déclaration préalable) with the town hall. Some town halls in the Lille area ask for one even for a like-for-like re-roof, so we recommend filing one for any full renovation. Processing takes one month, two in a protected area, but it is best to file it at least four months before the works.

Our guide to preparing the application (PDF, in French)
Who handles the scaffolding and the waste?

We do. We apply for permission to put up the scaffolding and cover the pavement occupancy fees. Old materials (tiles, slates, wood, metal) are taken away and recycled.

Which materials do you use?

Well-known brands: Postel 20 clay tiles by BMI Monier, suited to the local climate, Velux and Skylux roof windows, and Unilin, Actis and Recticel insulation.

Contact

A roofing project? Let’s talk.

Free quote, no obligation. We come out, assess the work and get back to you within 48 hours.

Request a quote

First contact by email through the form on this site.