Design and engineering services for custom home builders typically cost an average of $75 - $150 per hour. Depending on the complexity of the job and the type and quality of the accessories required, the cost can vary significantly. Factors that may affect the cost include the complexity of the job, the type and quality of the accessory, and the location and service provider.

The cost breakdown for design and engineering services for custom home builders usually consists of a fee for the initial consultation, design fees, and engineering fees. The initial consultation fee is typically a flat fee, while the design and engineering fees are generally based on the complexity of the job and the type and quality of the accessory.

The complexity of the job can affect the cost of design and engineering services. For example, if the job involves intricate designs or complex engineering tasks, the cost may be higher. Similarly, if the job requires high-quality accessories, the cost may also be higher.

The location and service provider can also affect the cost of design and engineering services. For example, if the service provider is located in an area with higher labor costs, the cost of the service may be higher. Additionally, the cost may also be affected by the reputation of the service provider.

Overall, the cost of design and engineering services for custom home builders can vary significantly depending on the complexity of the job, the type and quality of the accessory, and the location and service provider.