How many {present in work} are to/by {House} ?
How many from the house are working?
How many from the house are present in work?
SELECT ( COUNT ( ?e ) AS ?a ) { ?e property:present_in_work resource:House }
SELECT (COUNT(?sub) AS ?subs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?sub .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1441> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q23558 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P1441 wd:Q23558 }
17