Formulating diets for growing pigs that are low in protein (CP) and phosphorus (P), with minimal use of imported protein-rich feedstuffs and mineral phosphates (MP), while meeting digestible amino acid (dAA) and phosphorus (dP) requirements, is a challenge for sustainable pig production. This study formulated grower (40 kg) and finisher (60 kg) diets using local protein sources and no MP and evaluated effects on growth, body composition and nutrient balance. Forty-eight Swiss Large White pigs (12 blocks of four female or castrated male littermates) were housed in one pen and assigned to 4 iso-energetic ad libitum fed diets: Control (C), N-, P- and NP-. In N-, soybean meal was replaced with more rapeseed cake, protein beans and with five additional limiting synthetic AA to minimize CP, while maintaining dAA levels as in C. In P-, MP was removed and Ca:dP was maintained as in C by adjusting CaCO3. Diet NP- combined both N- and P-. All diets included 500 FTU/kg of microbial phytase. Compared to C, N- diets contained 3% (grower) and 0% (finisher) soybean meal with 140 g/kg (-10%) and 116 g/kg (-15%) CP; P- diets had 3.4 g/kg (-20%) and 3.0 g/kg (-22%) P. Daily individual feed intake and BW at the start, diet change, and end were recorded. Nutrient excretion was calculated by subtracting nutrient intake from body accretion, determined via dual X-ray absorptiometry at the start, diet change, and end. Statistics included sex, N and P effects and their interactions. No interactions between N- and P- were observed (P>0.05). Overall, growth performance remained unaffected. Body composition remained unchanged across diets, except for reduced (P<0.001) bone mineral content and density (-8% at diet change, -6% at end) in P-. N and P excretion were reduced (P<0.01) in grower and finisher periods by N- and P-, respectively, leading to overall reductions of 20% N and 25% P. These findings show that formulating diets without imported protein sources and MP successfully minimized N and P excretion while maintaining growth and lean tissue composition. Further research is needed to optimize microbial phytase supply in MP-free diets to mitigate bone demineralization.