So am I correct in that being: French and Walloon sites being The Belfry of the Town Hall, thus just the Belfry inscribed, but the Flemish ones as being Town Hall with Belfry, thus the whole building.
One way of determining this matter is by looking at the inscribed areas of the individual sites, doing a "reasonableness" check and assessing whether the area could be simply a tower or a larger building. To that end I have looked at a number of Flemish/Walloon Belfries (No French belfires have an area assigned to them) - some are standalone or almost -e.g the Belfry of Namur is a round tower -I have looked at Google street view and although it is attached on one side to another building this building is in no way part of it and couldn't be regarded as "integral".
The areas of the Walloon belfries are as follows -
Charleroi 0.007225 Ha
Mons 0.019881 Ha
Namur 0.014 Ha
Thuin 0.01 Ha
Tournai 0.01 Ha
By Comparison some Flemish locations are as follows
"Belfort met Lakenhal (Beffroi / Halle-aux-Draps) Ipres" 0.493 Ha
"Lo Stadhuis met Belfort" 0.086 Ha
Stadshal met Belfort Nieuwpoort, 0.04 Ha
i.e the inscribed areas of the Flanders Belfries inscribed areas are all considerably larger than those of Wallonia - which seems to confirm that they include "more" than just the Belfry. Thus -
a. That of Ypres at 4930 sq metres is equivalent to significant building of say 70m x 70m i.e the "Halle-aux-Draps" https://fr.wikipedia.org/wiki/Halles_aux_draps_%28Ypres%29
b. The Lo inscription at .086Ha is 860 sq m or say 40m x 25 - obviously far larger than a belfry on its own - so the description "Stadhuis MET Belfort" again seems to be supported.
Photo here https://en.wikipedia.org/wiki/Lo,_Belgium
c. The Nieuwpoort "Stadshal met Belfort" is .04Ha or 400 sq m ie 27 m by 15 m - possible as per the photo on Wiki https://en.wikipedia.org/wiki/Nieuwpoort,_Belgium
If we look at some of the Wallon belfries
a. The area of Binche Belfry (which is an integral part of Binche Town Hall) is given as .00172Ha i.e 17 sq metres - a square with sides of 4m x 4m approx which could be about right for a tower but is obviously considerably smaller than a complete town hall would be!! The only problem is that from the photos of the Town Hall the belfry only "starts" at Town Hall roof level so does the inscribed "tower" go down to ground level or does it start in mid-air?? Here is a photo of the Town Hall and Tower - http://humanandnatural.com/img-binche-belfry-of-the-city-hall--,belfries-of-belgium-8 85.htm
b. The Namur inscription (which Google street view shows to be a stand alone belfry as described above) its ground area is given as .014Ha i.e 140 sq metres - almost 10 x as large as the Binche belfry. But this is a round tower and would indeed be the case if the Tower's diameter were just over 13 metres - which from street view it could well be.
c. Charleroi Belfry is a given as 0.007225 Ha i.e at 72 sq metres - this is around 4 x as big as that of Binche. So, it should be around 9 x 8 metres. The Belfry tower of Charleroi Town Hall could easily be of that size. Certainly 72 sq m is far too small for tower PLUS town Hall!! . This Web site states that the town hall has a circumference of 240m an area of 3600 sq mhttp://www.opt.be/informations/tourist-attractions-charleroi-city-hall-of-charleroi/e n/V/38520.html
d. The Tuin inscription has an area of .01Ha or 100 sq m ie 10m x 10m. Photos of the tower show it indeed to be a "chunky" structure which has had other structures added to it -what seems to be an arched market hall - which could NOT be part of the inscribed 100 sq m.
So - it appears that indeed
a. A number of the inscribed Belfries are inscribed with their integral "non-belfry" structures
b. Some of the Belfries are genuinely stand alone structures e.g Namur
c. Some of the Belfries are inscribed separately from the larger structures of which they are a part. E.g Binche, Namur and Tuin.