To place a booking CLICK HERE

St John's School, Potter Street Hill, Pinner, HA5 3ZF

Please note: Two week's notice is required for a refund for cancellation.

If you are a STEM Den 'regular' and have completed the activity already on offer on the day you would like to attend, then please do email us, as quite often we can tailor the program to accomodate your specific needs. If you are building a portfolio for a STEM or DT&E scholarship at a Senior School this could be you!

To place a booking CLICK HERE

Easter 2026

Monday, 30th March: Easter Engineering & Magical Colours! 🐰Get ready to bring Easter to life with science! We'll use the awesome power of chromatography to uncover hidden colours, wire up glowing simple circuits, and become master engineers by building our very own moving, hopping Easter bunnies using mechanical cams.

Tuesday, 31st March: Tech Wizards & Wilderness Explorers! 🌲A spectacular day of two halves! First, unleash your inner tech-wizard by designing and printing your own digital art straight onto a garment using high-tech sublimation. Then, we’ll trade the screens for the great outdoors with hands-on Forest School crafting in our woodland classroom.

Wednesday, 1st April: The Great Egg-scape! 🥚Calling all problem-solvers! Can you and your team work together to crack our mystery codes and conquer our three egg-cellent problem-solving challenges? Bring your best teamwork and brainpower for a thrilling day of epic escapes!

Thursday, 2nd April: Spin-tastic Science! 🌪️Let's get dizzy with physics! Discover the hidden power of centrifugal forces in an action-packed day dedicated to all things that spin. You'll carry out epic experiments with fidget spinners and build your very own spinning creations to take home and amaze your friends.

🌳 Plus: Outdoor Woodland Adventures! Alongside the fantastic indoor STEM activities, every day children will have the opportunity for outdoor play in the beautiful woodland area at St John's School. This includes time for nature exploration and relaxation by the lit fire pit in the teepee.

CLASS AGE RESTRICTIONS - Please do not be offended if your child can not attend a class because they are not old enough... yet! We want the children to be safe, sometimes the activities are only suitable for older children. We are not insured for children under the age of 5 years. We want the children to be successful as well as independent. There are classes aimed for 5 & 6 year olds every day. These classes have teachers with experience of KS1, more helpers, the right height of furniture, shorter activities which change more frequently and break out activities such as Lego, painting and train tracks. We hope you understand.

WAITING LISTS - In the case that we are fully booked you can ask to be placed on a waiting list.

Please email: stemdennorthwood@gmail.com

In the subject heading put your child's surname and the week number you are looking for. In the body of the email please specify the dates you are looking for, as well as your child's full name. You will be emailed from this address if a place becomes available, make sure our mail does not end up in the junk.

SAFETY and USING TOOLS - One of the reasons STEM Den is so special is that we teach children to use tools to help them build, innovate and problem solve. The tools we use can cause injury if used incorrectly. All of our children are taught to use the equpiment safely and they are supervised when using the tools. Children are expected to behave appropriately when using tools. Parents/guardians who take up a place at STEM Den understand and agree to their children using the tools and equipment for each activity. There are risks involved, which are outweighed by the many benefits. If you have any concerns, please talk to us.

(During the winter time, we will have a fire in the teepee in the woods to help us warm up when it gets cold. We expect children to follow our safety instructions around the fire.)

For further information please read our terms and conditions.

What are the Science Crest Awards all about?

Plan, carry out and evaluate your own STEM based investigations to achieve a Nationally Recognized Award. Children aged between 5 and 10 will need 8 investigations all stamped off in their book, Children aged 10 and above take an all day challenge. Click here to find out more.

VEX robotics kits will be available every day on request, depending on availability. There are two different levels of kit depending on age and experience. We have VEX GO and VEX IQ. For our younger students from Rec to Year 3 we have VEX 123 or Educational Lego kits are ideal to start the journey of programming. For our youngest students aged 5 to 7 we suggest this is taught in small bitesize chunks around half an hour long.

Click the link to find out more.

Our LEGO, SPHERO BOLT, CRUMBLE and VEX kits are to be used within the camp only and cannot be taken home. You might like to buy a CRUMBLE kit. They are available from Redfern electronics to purchase for around £35 and can be used for hundreds of other project ideas. Software for this is a free download. For more details click here.)