Hi!

You could start here:

Poitou-Charentes Building & Renovation - AngloINFO, in Poitou-Charentes, France

( not those with just names lists ).

and here in French:

Moteur de recherche service-public.fr : résultats de la recherche

and here:

Faire construire par un architecte

NB. If the "surface hors oeuvre" is greater as 170 sqm you need legally an archititect;

Yours,

giantpanda