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In the new era of time-domain surveys Type Ia supernovae are being caughtsooner after explosion, which has exposed significant variation in their earlylight curves. Two driving factors for early time evolution are the distributionof nickel in the ejecta and the presence of flux excesses of various causes. Weperform an analysis of the largest young SN Ia sample to date. We compare 115SN Ia light curves from the Zwicky Transient Facility to the turtls model gridcontaining light curves of Chandrasekhar-mass explosions with a range of nickelmasses, nickel distributions and explosion energies. We find that the majorityof our observed light curves are well reproduced by Chandrasekhar-massexplosion models with a preference for highly extended nickel distributions. Weidentify six SNe Ia with an early-time flux excess in our g- and r-band data(four `blue' and two `red' flux excesses). We find an intrinsic rate of 18+/-11per cent of early flux excesses in SNe Ia at z < 0.07, based on three detectedflux excesses out of 30 (10 per cent) observed SNe Ia with a simulatedefficiency of 57 per cent. This is comparable to rates of flux excesses in theliterature but also accounts for detection efficiencies. Two of these eventsare mostly consistent with CSM interaction, while the other four have longerlifetimes in agreement with companion interaction and nickel-clump models. Wefind a higher frequency of flux excesses in 91T/99aa-like events (44+/-13 percent).

Constraining Type Ia supernova explosions and early flux excesses with the Zwicky Transient Factory