Ahouse1

7-WITHOUT ANY LABOR OR WORDS:
a-Just leave quarrelling even if you were right.
b-Just leave lying even if you were just joking.
8-BY HAVING A GOOD QUALITY:
"Good manners"
"I guarantee a house on the outskirts of Jannah for he who leaves quarrelling,even if he were right,and a house in the middle of Jannah for he who leaves lying even if he were joking,and a house at the highest point in Jannah for he who has good manners."(Abu dawood).
9-BY HAVING PATIENCE AND PERSEVERANCE:
{If a son of the servant of Allah dies,Allah says to His angels:
'Have you taken the soul of my servant's son?'
They say:'Yes.'
Then He says: 'you have taken the apple of his heart?'
They answer:'yes!'
Then He says: 'What did my servant say?'
They say: 'He praised You and said:"Inna lillahi wainna ilayhi raji3oon."
So Allah says:"Build a house for him in Jannah and call the house of Hhamd-house of praise"}(Ahmad and Al-Tirmithy)

You can join between more than one of the above,so you can build more than one house,what is important is persisting on doing so.

PS: If you were of the ones persisting on one of these tasks and something happened ,like sickness or travel,that prevented you from fulfilling those tasks,then it falls off your back during that period:
"If a servant gets sick,or travelled,he will get the same deeds as if he were doing them while in good health or while he was settled(residing)."(al-Bukhary).

There are also other ways to get a house for a cheap price:
CAUTION: We do not recommend these ways.
The problem is that the house is in a very hot area ,with a river of fire nearby.,and the neighbors are devils,and the trees are fruitstalks like the heads of devils "talhuhu ka anhu rous ashayateen"(Quran 37:65).
ALL YOU HAVE TO DO IS:
1)Say a false lie on purpose about the Prophet(sala Allahu alyhi wasalam),i.e. to say he said so and so ,while he didn't.
"Whosoever says falseness about me on purpose let him expect ahouse in Hell."(Ahmad).
2)If you like people to arise for you upon your entrance:
"Who like to have people stand for him (upon entering a place)let him expect a house in Hell."(Ahmad).

SPECIAL OFFER FOR GARDENS:
Free plants and trees:
-{Whosoever says :"subhanallahu al3atheem", a plant sprouts for him in Jannah.}(Ahmad).
-{The prophet(sala Allahu alyhi waslama)passed by Abu Hurayra while he was planting some plants,so he said:"What are you planting?" He said:"Some plants of mine."
So he said:"Should I not teach you of plants better than those?"He said :"Yes." He said :" say:
'Subhanallah,alhamdulillah,lailaha illa Allah,wa allahu akbar'
You will get a tree for each of them in Jannah.}(Ibn Majah).
-In the hadeeth of Isra'a the prophet sala Alahu alyhi wasalam passed by Ibraheem alyhi-salam,so he said to him:"Order your ummah to get much of the plants of jannah,for it's soil is good and the land is vast."He said what are the plants of jannah?He said:"La hawal wala quwata illa billah.}(Ahmad).