In-house

Around 30% increase in power seen in in-house comparisons with previous model.

Source: tatoeba (373577)

Presenting only the finest quality of spices, teas, dried fruits, and herbs, NY Spice Shop is committed to offering only the best ingredients to you and your family. Our products are tried and tested in our home kitchens before they are deemed ready for yours. With blends lovingly created by our in-house staff, we believe that our enthusiasm and passion will be showcased in the food you eat and enchant your senses as much as it does ours.

Source: tatoeba (12859224)

We need to keep this part of the project in-house; it's far too important to contract out.

Source: tatoeba (13627792)

MUTV, United’s in-house channel, was so confused by all the changes it announced before kick-off that Matic would be playing as a centre-half.

Source: wiktionary