The cost of building a G+6-storey house in Dhaka city with current material prices can vary significantly depending on several factors, including:

• Construction materials: The type and quality of materials used will directly impact the cost. Higher-quality materials will be more expensive.
• Labor costs: The prevailing wages for construction workers in Dhaka can vary, affecting the overall labor costs.
• Design complexity: More intricate designs with unique architectural features or custom finishes will increase the cost.
• Permits and approvals: Obtaining necessary permits and approvals from local authorities can add to the expenses.
• Site conditions: The location of the construction site, soil conditions, and any existing infrastructure can influence the cost.

Given the limited information provided, it's challenging to provide an accurate estimate. However, based on recent trends in Dhaka's construction market, you can expect the cost per floor to range from approximately BDT 12-15 lakhs (approximately USD 14,000-18,000) for a basic structure to BDT 20-25 lakhs (approximately USD 24,000-30,000) for a more luxurious finish.

For a more precise estimate, it's recommended to consult with local architects, builders, and contractors. They can provide detailed cost breakdowns based on your specific requirements and current market conditions in Dhaka.

Additional factors to consider:

• Inflation: Construction costs can fluctuate due to inflation.
• Hidden costs: Unexpected expenses may arise during construction, such as changes in design or unforeseen site conditions.
• Finances: Ensure you have adequate financial resources to cover the total cost of construction, including potential contingencies.

By carefully considering these factors and obtaining professional estimates, you can make informed decisions about the construction of your G+6-storey house in Dhaka city.