Sagittarius is the sign of wide open spaces, and wants plenty of room to roam. This is a sign that doesn't appreciate being tied down too much!
The areas of life ruled by the house in your natal chart that falls in Sagittarius can be areas of your life where you'll crave more space, wanting to have enough freedom to do things your own way in your own time.
Sagittarius is a fire sign, along with Aries and Leo. The fire signs are the signs of energy and action, and Sagittarius is enthusiastic and ready for adventure. It's full of passion for whatever it's really invested in.
Sagittarius is also a mutable sign, along with Gemini, Virgo, and Pisces. The mutable signs are adaptable and flowing, and this helps Sagittarius to stay open to changes in life and be willing to embrace new experiences with zeal.
Sagittarius is ruled by happy planet Jupiter, the planet of expansion. This is part of what makes Sagittarius a sign that loves space. It doesn't want to feel like it's suffocating at all. It needs the room to flow however it wants, whenever it wants.
1st house: The 1st house rules the self, so a Sagittarius 1st house may show you may need space throughout your life so you can showcase yourself. You may seem like someone who always wants space, even if you are adaptable with others and sociable.
2nd house: The 2nd house rules money and values, so a Sagittarius 2nd house may show you may need space with the way you make money. You may want to work on your own, and crave the room to do whatever you want with money. You may need space to figure out your values and live accordingly.
3rd house: The 3rd house rules communication and your outlook, so a Sagittarius 3rd house may show you may have a wider perspective and try to keep an open mind. You may want some space when you're dealing with mental challenges, and when focusing on ideas and plans.
4th house: The 4th house rules the home and family, so a Sagittarius 4th house may show you require a lot of space at home. You may even need a huge house to be comfortable! And you may want plenty of space with your family, even though you may also be very caring with them.
5th house: The 5th house rules who and what you love, so a Sagittarius 5th house may show you want lots of time and space to be with those you love most and do the things you love to do. You may be extra creative, and time and space can increase it.
6th house: The 6th house rules your work and daily life, so a Sagittarius 6th house may show you want lots of space when you're working and tending to the little things. You may struggle if you don't have enough space in your daily life, and plenty of space can help your overall well being.
7th house: The 7th house rules your relationships, so a Sagittarius 7th house may show you want enough space in your relationships and partnerships that you don't feel held back. You likely need to find some balance between commitment and the need for space.
8th house: The 8th house rules transformations, so a Sagittarius 8th house may show you need space to transform yourself or your life for the better, or that you may need to undergo a transformation in order to get the space you need. You may require space and time when dealing with serious matters.
9th house: The 9th house rules higher learning and travel, so a Sagittarius 9th house may show you need space to advance your learning and skills. You can learn a lot from experience as well. You may greatly enjoy travel to far places and getting that kind of space periodically.
10th house: The 10th house rules your goals and direction, so a Sagittarius 10th house may show you need space when you're pursuing your goals. You may prefer a career that allows you to work on your own, and you may view having lots of space and freedom as an aspiration.
11th house: The 11th house rules your friends and dreams, so a Sagittarius 11th house may show you want enough space with friends that you don't feel stifled by them, and you may require more space when you're pursuing your dreams. You may be extra independent.
12th house: The 12th house rules what's hidden and your subconscious, so a Sagittarius 12th house may show you crave a lot of space in the background and behind the scenes. You may want more space subconsciously, and can explore more of your subconscious when given space.
Suggested Reading: Aquarius Houses: Where You're Different