Don't know what to do with this...

How old is he?

Basically a complete stranger knocked on your door to say one of your two builders looked strangely at someone who lives so far away you don’t know their address and can’t see their house?

And she doesn’t drive (16) so either a parent was also there at the time or this complete stranger who says he is her boyfriend uses the parking space belonging to the parents of his girlfriend?

So, is he also a teenager? Or older? Either way, I’m 😵‍💫👀😵‍💫 at him to be honest.

Couldn't you diffuse the situation by asking the builders to smoke elsewhere? Then they are not hanging out in the same place and therefore less likely to be looking at this teen? Without needing to go into the details with them

Well yes, I’m just emphasising the distance between you and them. And now you say this boy looks about 16 years old, and he thinks it’s okay to knock on the door of a complete stranger and accuse their builder (also a complete stranger) of looking at his gf in a funny way? It is all coming across as very possessive to me, very strange of him.

Was the boy with her when this happened? If so, why didn’t he say something to the builder concerned?

If he wasn’t with her, who was?

And, is she or her parents aware he came to knock on your door ‘late evening’ on Friday? Or is he stirring up problems for her for dressing in a way he doesn’t like blah blah blah?

Bit pathetic of her to ask her boyfriend to ask you! If someone had bothered me at 16, I wouldn't have seen why it was any more appropriate to ask my boyfriend to speak to people than to do it myself-he isn't a parent, or police!

I’d need more information before I did anything, either way. When did it happen, what does a “funny look” mean, did she want the BF to come to the neighbours door etc. I wouldn’t go in with half a story from a 3rd party who wasn’t there.

The boy is an attention seeking idiot ignore him

I would do nothing. Sounds like someone is trying to whip up a drama. What exactly is looking in a "funny" way? I can imagine what my mother would have said if I had told her this. She would probably have laughed her head off. I would probably have done the same

OP the girls parents need to raise this with you if there’s an issue. The boyfriend doesn’t live there.

I wouldn’t speak to the workmen without confirming exactly what happened.

I'd say you're happy to address it but need something more specific. Where was he / where was she? Was he staring for a long time? Smirking? Looking her up and down when she passed? Looking at her breasts instead of her face? I don't think 'funny' is enough to go on

I think boyfriend has massively overstepped here. If there was an issue with the workman, either the girlfriend or her parents could have come to you but it absolutely isn’t the place of the girls boyfriend.

I have sons and if one of mine behaved like this I’d be livid.

They sound like a pair of troublemakers.

When I lived in London, honestly the amount of people who would come up to me and aggressively state "oi, who do you think you're looking at?" well I've lost count. And I hadn't even glanced in their direction!

Some people are really, really weird about what they perceive to be someone "looking" at them. In my experience, if they really want to cause trouble, they send the boyfriend round, so, yeah...

But if you can't see their house from your house, and he had just stepped outside for a smoke, how did he manage to even see her, let alone give her a funny look? Where was she?

I'd be inclined to put this down to jealous boyfriend/attention seeking nonsense to be honest.

So the boyfriend gets upset at the possibility of someone eyeing his lass up? Yet instead of having a word with the bloke concerned, he wants your husband to fight this imaginary battle for him? I'd be inclined to have a chuckle and think "get a grip, soft lad!"

OP explained they have a parking spot by OPs house.

I don’t necessarily think the OP shoukd say anything to the builders since they’ll be gone soon. But, I’m quite astounded at how horrible posters have been about the boyfriend, the daughter and teenagers in general on here.
Sadly as a 16yo girl she has probably already her fair share of grown men “looking at her funny”. Why should she just up and shut up?
Her boyfriend is helping her to address it. How is that a problem / red flag? And those saying the boyfriend should approach the builders himself (or that she should?!). I’m going to assume he’s also around the same age as her. Is he really going to feel confident or safe going directly to the builders whom i’m guessing are adults and quite a bit bigger than them. What would you want your DS’s to do in this situation?

As I have to remind my children a thousand times a day when one accuses the other of looking at them in some kind of way: we can't control how or where people point their eyes. I don't think there is a way you can say to the workmen "please do not stand outside and look at our neighbours" without causing bad blood. That is, unless you have evidence that he was in fact letching on her, which would be an awkward but more justified conversation.

If you see the boyfriend again, I would maybe say that you did not take any action on this one occasion as the builders will be gone soon, but if the girl is really upset or worried, to get her parents to contact you.

Well quite. That means an adult who can drive would be with her too since 16yr olds cannot drive. It's all sounds very fishy.

I don’t think anyone has been particularly horrible have they? But I’m pretty gobsmacked at the balls of a 16 year old boy (OP said he looks the same age) to knock on a complete strangers door late in the evening complaining about their builder looking at his girlfriend when neither of them seem to have asked the girls own parents about it. If your 16 year old son said ‘mum, my girlfriend says this and that’, wouldn’t you say ‘tell her parents’? The whole story comes across as weird, he has never met OP or her husband before yet felt ok to tell them all about what their builder has been doing?

Edited to say he’s not ‘helping her to address it’ is he?

I said that earlier but OP didn’t say anything 🤷‍♀️.

There's too much speculation here but I think if a child in your neighborhood has felt uncomfortable by the actions of someone working for you, you have at least a bit of a responsibility to find out more. Why not ask the girl or her parents what she means. I get that it would be awkward to raise if you then had to but you could just pass on that you've had a complaint that one of the workmen had made a girl feel uncomfortable and leave it at that.

I think I’d just say to them to “be a bit careful as a young lady nearby apparently seems to think she was looked at a bit funny, whatever that looks like; who knows what that means” with a shrug of your shoulders and a confused gesture.

That way you are giving them a warning to behave if warranted, or a be careful if it was misinterpreted. You aren’t insinuating, just passing on a message.