covering letter along with CV

[jijo.81@gmail.com]

I am graduate and seekinf for a job in a construction firm. So do I write letter to the company along with the application form?

[Raymott]

I am graduate and seekinf for a job in a construction firm. So do I write letter to the company along with the application form?

Yes, you can write a short cover letter. Depending on what is on the application form, there might be something you feel you should tell them. You can put this in your introductory letter.
Otherwise, you can simply write:

Dear XXX.
Please find attached my application for YYY.
If you should require further information, please contact me.

Your Sincerely,

If they don't want the letter, they can throw it away. It can't do any harm.