One of my friend is looking for some good house built by Construction companies (like Civil Homes, CE Constrution etc, or any ?) 

I have seen some house of 48 lakh, 58 lakh and some more than 1 crore too. 
His family budget allows only those of around 50 lakh.

What is your suggestion sajha guys ? Are those house good ? 
or its better to buy land and build ownself ?

Do you have any suggesion or links of those type of houses ? 

Buying land and building house himself isn't an option unless he's looking to buy land outside the valley (that is, considering his budget). 

Truth be told, even a semi-decent neighborhood in Kathmandu has an ANA of land being sold at 15-20 lakh rupees. I don't know if he'd wanna build a land w/ 2.5 ana jagga. 

Buying a house built by other companies might be a better option. 

Upto 3-4 km out from ring road is fine. Does it really cost 15-20 lakh per ana in those area too ? 

 I believe you won't get anything lower than 8-10 lakh per ana unless you're talking about the rural areas in Lalitpur. 

 Okey lets talk about built Colony Houses. Anybody has any experience of them ?

Does anybody know how much it cost to build a house in Budhanilkantha area? I think its better to live in suburb than the crowded valley.

 I don't think you can find an ana of land in Budhanilkantha area for less than 20 lakh. 

So you do the math now. 

Holy Sh*t! That's like $120 K for 5 Ana. Kaile kamaune ho kaile kinne ho jagga? Ghar ta parai jaos!!

हैन त्यो बिदेसमा त टाटा टिप्न पाइन्छ भन्छन अनि सबै बिदेस नै दौडेका छन , किन हो तेस्तो हरेस खाएको . त्यो हरेसको नसा त चरेसको नसा भन्दा पनि हरिप हुन्छ है , तेस्लाई नजिकिन नदेउ .

Check out www.housingnepal.com . It has most of the information you need. People will tell you anything since the sellers are free to sell a land worth 25 lakh for 1 crore , if you buy it.