As an electrician by trade for 30 years. block or cement walls are a nightmare when it comes to adding additional outlets. hopefully there is sufficient outlets and lighting for the majority of the rooms that you can just leave those as is. These days most tvs and lights are led or flourescent so current draw is minimal compared to what draw used to be just 10 or 15 years ago. Honestly, one circuit should be more than enough for a standard home with LED tv's and a light in the center of each room. As for the kitchens and bathrooms, hopefully the outlets have conduit back to the panel and you can just add a bit of additional wiring to separate any circuiting that might have been combined with other household outlets. From the couple of times that i looked at electrical stuff in the DR, I did see conduit, if the home was built that way recircuiting isn't difficult, just as a rule of thumb a 20 amp circuit breaker can comfortably supply 1800 watts of power. so a if you have 8 watt LED bulbs, you can put over 200 of them in those 3 bedrooms0 (im kidding, of course you wouldn't have 200 lights but technically you could). Im sure these few circuits would be fine for the majority of the house, I would just concern myself more with getting appliance circuits separated from them and maybe separating the outlets in the bathrooms where you may use a hair dryer.
