Those are older mods, so technically, they're past prime time.
Build High expands the Sanctuary area up to Vault 111 to across the river to just up to the statue. Height wise, well it will allow you to build structures as high as you want.
Higher Settlement Budget and Settlements Expanded both increase your cap to allow you to far exceed what Bethesda capped it at. So either mod would allow you to add goodies to your hearts content. If you're looking for a single mod that does both, I haven't seen it yet. But I was looking at the forums for SB and it sounds like the latest patches and add on's have rendered the mod useless. If I remember, I'll look into that later and see if it can still be activated.
But with the beta release and imminent release of the GECK, there should be a number of mods coming out that are able to dive alot deeper and cleaner into the guts of the game.