There are several ways to lower the building materials costs for construction projects:

1. Compare prices: Shop around for the best prices and deals on building materials. Compare prices from different suppliers and consider purchasing in bulk to get discounts.

2. Use recycled materials: Consider using recycled or salvaged materials for your construction project. This not only lowers costs but also helps reduce waste and promotes sustainability.

3. Simplify the design: A complex design often requires more expensive materials and labor. Simplify the design of the project to reduce the cost of materials needed.

4. Use alternative materials: Consider using alternative materials such as bamboo, compressed earth blocks, or straw bales. These materials are often cheaper than traditional building materials and can be just as effective.

5. Use standard sizes: When possible, use standard sizes for building materials such as lumber, plywood, and drywall. Custom sizes can be more expensive and may require special ordering.

6. Negotiate with suppliers: Don't be afraid to negotiate with suppliers. Ask for discounts or if they have any promotions running that you can take advantage of.

Plan ahead: Plan ahead for the construction project to avoid rush orders or last-minute changes. This can help you avoid paying extra fees for expedited delivery or additional labor costs.

By implementing these strategies, you can significantly lower the building materials costs for your construction project.

Besides all the above reasons, you can digitalize and improve your sourcing process, which allows you to source and compare more options and make better decisions. Sourcing new building materials vendors and products on an online B2B marketplace can be beneficial:

1. Access to a wider range of products: Online B2B marketplaces offer access to a wider range of building materials vendors and products from different geographical locations. This can provide greater variety and potential cost savings.

2. Streamlined procurement: Online B2B marketplaces can provide a streamlined procurement process, allowing for faster and more efficient sourcing and purchasing of building materials. This can save time and resources, particularly for larger-scale construction projects.

3. Competitive pricing: Increased competition on online B2B marketplaces can result in more competitive pricing, as vendors may offer better deals in order to secure business. This can help to reduce costs for construction projects.

4. Product and vendor reviews: Online B2B marketplaces often offer product and vendor reviews, which can provide insight into the quality of products and the reliability of vendors. This can help ensure that the chosen materials and vendors meet the required standards.

5. Time-saving: Online B2B marketplaces can save time for builders, contractors, and project managers, as they can quickly compare prices and specifications of different building materials from different vendors. They can also be accessed from anywhere, at any time, making it easy to keep the procurement process moving forward.

Overall, sourcing new building materials vendors and products on online B2B marketplaces can offer a range of benefits for construction projects, including increased access to products, streamlined procurement, competitive pricing, product and vendor reviews, and time-saving convenience.