1. There used to be a house here. [simple past, in fact].

2. They used to drive to school. [simple past, in fact] Therefore, the interrogative and negative follow the rules using DID + infinitive.

Past: Did there use to be a house here? Negative: There didn't use to be a house here.

Did they use to drive to school? They didn't use to drive to school.

http://beta.yt4school.jwrm.uk/watch.php?v=EvjdYDhyfv4

1. There used to be a house here. [simple past, in fact].

2. They used to drive to school. [simple past, in fact] Therefore, the interrogative and negative follow the rules using DID + infinitive.

Past: Did there use to be a house here? Negative: There didn't use to be a house here.

Did they use to drive to school? They didn't use to drive to school.

http://beta.yt4school.jwrm.uk/watch.php?v=EvjdYDhyfv4

And here is the British Council: https://learnenglish.britishcouncil.org/en/quick-grammar/used-infinitive-and-beget-used

But the same is true in American English and Canadian English.

And this is not googleable or ngrammable.

It does not matter that /used to/ + verb is a defective form. It still follows the regular English rule re negative and interrogative which is: did + notional form of the verb.