Leeman’s as a Day House, is home to around 90 boys aged 13 to 18 and is a thriving and busy community from 8.30am-5.30pm. Leeman’s boys can be identified around campus by their stylish pink and black ties and their distinctive pink singlets which stand out on School Sports Day and the House cross country competitions. Boys can also earn themselves a House honours badge for exceptional contribution to Leeman’s, although it is rare to earn these before Year 11. Leeman’s won the prestigious Brewers' Bowl competition in 2018 & 2019 whilst also winning the Boys' Sports Shield in 2019. Leeman’s also went onto win both online versions during the summer 2020 lockdown.

Leeman’s House is a large building central to the school site. Each tutor group has their own day room to use as a base and there is a huge Games / Assembly room which plays host to the many House table tennis and pool competitions.

Mr Cornock, Housemaster since January 2015, came to Aldenham in 2009 as Head of PE and Football. He previously worked at JFK Catholic School in Hemel Hempstead before joining Aldenham as a tutor in Martineau's for 3 years, later becoming Assistant Housemaster. He enjoyed that role for two years before being appointed Leeman's Housemaster in January 2015. Mr Cornock has a study and sitting rooms within Leeman’s from where he runs the House. There is also a tutor study where his team of 8 tutors are based.