Clearly defined dates for delivery and installation.

Specifically details the manufacture, delivery, dismantling of old windows, and installation of new PVC windows, including windowsill and drainage components.

Defines the warranty period for both the product (profile/fittings) and the installation work. 2. Crucial Clauses to Verify

Signed by both sides to prevent disputes over window sizes.

Specifies the contractor's liability for damaging walls, furniture, or failing to meet deadlines. 3. Essential Attached Documents

Ensure the contract mentions installation according to ГОСТ 34378-2018 (or the updated 2024 equivalent).

Must include precise measurements, window profile type (e.g., brand, chambers), glass unit specs, and accessories.