give photo copies and offer original documents for inspection to the builder 

it cannot be misused by the builder 

you can handover the photocopies of the documents and make an endorsement in the copies that they are given for the purpose of reference only and put your signature and date in it. 

Please do not handled over any originals. If they insist, show them the original documents. There's no harm in handing over copies.

- Only a photo copy of the property document in the absence of original having no value in the eye of law. 

- You can handover the photocopy of the same to him , however for your peace of mind you can mention at the first page of the said photocopy that it is being given for the verification only and nothing more. 

Show him originals for verification.
Give only crossed ("For Collaboration Purposes Only") signed photocopies if absolutely needed.
Do not hand over originals or uncrossed copies — crossed copies reduce misuse risk (like fraud or unauthorized use).
Also, take a written acknowledgment of any photocopies handed over.

Yes you can make him inspect and supply crossed photo copies with endorsement on it stating provided for purposes of verification. also take an acknowledgment on a covering letter from him

Dear Client,

1. Let him view originals first before you, but you don't part with them.
2. Crossed Photocopies: You can give photocopies with "For Verification Purpose Only" stamped across each page, dated and signed — this prevents misuse.
3. Precaution: Even crossed copies can be misused sometimes; thus, provide copies only after a simple draft agreement or MOU is signed to determine mutual intent.