A general contractor will always make gains from your expenses, and it will always try to find the cheaper options taking care first of the profits. In a lot of cases the general contractor work as a jack of all trades and will have to sub contract other Specialized Contractors like electricians, pool builders, plumbers, etc, generating double payment of profits to the investor. (General Contractor + Sub Contractor = $+$)
We as Construction Project  Managers work with no hidden cost and will not going to make gains from any work ejecuted in your project, we focus in following cost control and finding the best quality option for each job performed. We coordinate and supervise with the objective of concluding with excellence in quality each one of the executed works.

It is perfectly legal for foreigners to build & own Mexican real estate. Beyond the somewhat tedious process of setting up a bank trust (fideicomiso), buying property in Mexico as an American or Canadian is fairly straightforward.
What is a fideicomiso?
A fideicomiso is a trust that allows foreigners to buy property in Mexico with all the rights of a Mexican citizen. This is a safe, legal, and extremely common vehicle for foreign ownership of real estate in Mexico. Sell it, rent it, build on it, live on it, or pass it down to your heirs… the choice is yours!
Can the Mexican government sieze my property? 
No. If your property was purchased legally and you are not doing anything illegal on the property, the Mexican government has no legal right to take the property, nor do they want to discourage tourism of foreign investments.
Under NAFTA, Mexico may not directly, or indirectly, expropriate property except for a public purpose. For example, if the land is required to build roads or railways. This same process exists in most countries including the US and Canada.

Yes, you can simply invest as a foreign citizen with all the partners you want dividing the ownership of the lot/house/apartment in 2 to 6 parts.
We also can create a Mexican Corporation that can be formed in four weeks with at least two partners. Both can be foreigners; no Mexican citizen is needed. It costs a maximum of $1,500 USD plus a small investment capital ($1,000 USD) and from there you can use it to acquire property through a normal transaction as a Mexican national would. So in a month and a half, you can have the corporation formed and the property under its name to begin the construction. You can also buy a car and pretty much anything you want with it. But price and speed are the only benefits of a corp.

The corporation ties you to an accountant for life. Even if it reports zero income, an accountant will charge you a fee. To act on behalf of the corporation as a partner you need to get your resident status, otherwise you will have to act through powers of attorney given in the corporation to DIEM MANAGEMENT. Everything, and we mean everything you buy through a corporation, has to be done through a check and or wire transfer made from the corporation bank account, so cash is not an option. Finally, the biggest downside: there is no way to avoid capital gains when selling the property. If you manage the property properly and get fiscal receipts for everything you do in the house, you can deduct that against the profit at the time you sell to lower the tax bill, but you can´t avoid it completely.

Tax: A 2% acquisition tax is payable by the buyer when the property changes ownership to them. This is part of the closing costs.
Property Tax: This is called predial, and the average cost is approximately 0.1% of the assessed value of the property at the time of sale.

If you’re planning to pay your down payment or full payment from a non-mexican bank account, you’ll want to keep an eye on the exchange rate and associated fees from your bank. Most property is listed in USD, so no matter what, you will have to ask your bank to convert to USD before sending the transfer.

Wire transfers are the gold standard and are sometimes the only available method when sending payments to purchase property in Mexico, and are also very secure. If the amount is not greater than $10K USD, we suggest using Wise.com as they consistently offer the best exchange rates and the lowest fees.

The price per square meter is around $1,100 to $3,500 USD. (Between $130 USD/sqf to $350 USD /sqf) Lot/Land coast not included.
A $1,100 USD to $1,400 USD sq/m2
AA $1,400 USD to $2,000 USD sq/m2
AAA $2,000 USD to $3,000 USD sq/m2
AAA+ FROM $3,000 sq/m2

Between 15% and 25% of the total coast of the construction, depending in the size and the work schedule. No extras, no hidden costs.