We try to group all known restrictions by law to a ultralight-design. If you know any other, give us a sign. Belgium: Wingarea has to be 10 m2 (107.6 sq.ft.) minimum, wingloading may not exceed 25 daN/m2 by maximum take-off weight. Maximum take-off weight is 250 kg (551.15 lb) (1 seat) or 390 (859.7lb) (2 seats). Maximum enginepower is 30 kW (22.05 pk) (1 seat) or 48 kW (35.28 pk) (2 seats).

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France:

Maximum take-off weight is 300 kg (661.38 lb) (1 seat) or 450 kg (992.07 lb) (2seats). 5% weight may be added when using a parachute or floats. Maximum enginepower is 45 kW (33.075 pk) (1 seat) or 60 kW (44.1 pk) (2 seats). Maximum take-off-speed is 65 km/h (40.3 mph). Maximum wingloading is 30 kg/m² (6.146 lb/sq.ft.).
More info can be found on the next sites:
http://www.interpc.fr/ffplum/download/arrete.pdf
http://www.interpc.fr/ffplum/download/instruction.pdf
(in French, of course !)

USA:

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