To　enhance　the　efficiency　and　cost-effectiveness　of　heating,　air-conditioning,　and　solid　waste　recycling　in　buildings,　this　work　proposed　the　solid　waste　semi-coke　ash　as　skeleton　material　and　the　sodium　carbonate　as　phase-change　material　to　produce　shape-stable　phase-change　composites　using　the　cold　compression-hot　sintering　method　for　building　thermal　energy　storage.　Eight　shape-stable　phase-change　composites　were　prepared　and　the　detailed　chemical　compatibility,　thermal　property,　structural　and　mechanical　performance,　and　micromorphology　were　investigated　by　X-ray　diffraction,　differential　scanning　calorimetry,　laser　flash　analysis,　N2　adsorption　and　desorption　method,　constant　speed　pressurization　method,　and　scanning　electron　microscopy.　Results　demonstrated　that　semi-coke　ash　is　suitable　with　sodium　carbonate　for　fabricating　shape-stable　phase-change　composites.　The　optimal　mass　ratio　of　semi-coke　ash　to　Na2CO3　powder　for　sample　CC3　was　determined　to　be　52.5:47.5.　This　particular　sample　demonstrated　a　thermal　energy　storage　density　of　961.58　J/g　and　a　maximum　thermal　conductivity　of　1.306　W/(m　∙　K).　It　also　exhibited　excellent　chemical　compatibility　between　its　components.　Furthermore,　sample　CC3　displayed　a　mechanical　strength　of　23.57　MPa,　with　elements　evenly　distributed　throughout.　Importantly,　CO2　emission　from　the　production　of　sample　CC3　was　significantly　low,　indicating　great　potential　for　commercialization.　©　2024　Elsevier　B.V.