Drita, there are two types of agents:
1) Listing Agents - These agents represent the SELLER.
2) Buyer Agents - These agents represent the BUYER.
You could drive by the home, get the number off the sign and contact the Listing agent, but if you do so without being represented by a Buyers Agent, then you have just given all of your negotiation power over to the seller (not a good idea).
On the other hand you could contact a Buyer's Agent, make sure you have a pre-qualification LSR (official qualification form) and have the Buyer's Agent (now your agent) find out the specific details required to see the home (i.e. special gate codes, pet alert, alarm instructions, notice required).
If you are not currently working with a Buyer's Agent, then I highly suggest you get one as soon as possible. Their services are usually free (Buyer's Agents receive a fee from the seller upon closing) and they have a WEALTH OF KNOWLEDGE on the current real estate market.
If you would like a free consultation and more information on this specific home and other homes that are similar to this home in the same area, feel free to contact me at the website below: