Silom

Glur Bangkok
45 Chareonkrung Soi 50, 02-630-5595. Open 24 hours daily. BTS Saphan Taksin exit 1.  www.facebook.com/GLURBANGKOK Located just a minute’s walk from BTS Saphan Taksin, Glur Bangkok is a hostel, café and bar wrapped in one and is the latest 24-hour hotspot on our radar. Don't let the hostel part deter you, while the café is limited to only a small number of seats, the atmosphere is quite relaxed and work-friendly. Coffee starts from B75 for a hot Americano or latte while beers by the bottle are also available at B90 for locals and B110 for imports.

Think Tank
Narathiwat Soi 17 (Nanglinjee Rd.) 086-784-9384. 
Think Tank is something between a co-working space and a 24-hour café, as they welcome both walk-in customers and also provide the option of a private room for groups of 6-8 people at an extra charge of B100 per hour. The décor might be rather simple but they’ve got some comfy bean bags for you to plop down on and enjoy an iced cappuccino (B80) with homemade waffle (B65).

Too Fast To Sleep
Rama 4 Rd., 086-577-8989. MRT Sam Yan. Open daily 24 hrs.
Too Fast Too Sleep has been opened for two years now, but is still one of Bangkok's most popular 24-hour cafés. Decked out to resemble a library-meets-café, the place not only supports late-night working, but they also welcome insomniacs with a heap of books that you can just pick up to read with a cup of coffee (from B80 and cake from B120).

Coffee Society
12/3 Silom Rd (close to Silom Soi 2)., 02-235-9784. BTS Saladaeng. Open 24 hours.
After undergoing a big renovation in late 2013, this classic 24-hour café on Silom Road is now back fully opened, all in all with a much brighter decor. The café still offers Thai-international favorties with coffee, as well as free wi-fi and seats that you can work at during the night. Strangely. there are less sockets than before, but this is still one place you can count on at any time of day.

Sukhumvit

Fu.5 Coffee
1/F Thru Thonglor Condomimium, Petchburi Rd. Open 24 hours daily. www.facebook.com/FU5Coffee
Fu.5 Coffee was born from the idea that not all late-night activities have to involve drinking, and that Bangkok should have more places that offer a laidback community vibe. The place has a library-meets-living room kind of feel, where you can choose from a proper table for coffee and cake, the zone with power sockets or the meeting room for group work.    

24 Owls
39/9 Ekkamai Soi 12. 02-391-4509. Open 24 hours daily. BTS Ekkamai.
Run by the former Sometime’s Café team, 24 Owls is offers 360-degree services: it's a café, restaurant and co-working community wrapped in one. The old house-turned-café has been redecorated in an English garden style with a red phone booth in the front and space to work on your laptop both indoors and outdoors--just ask staff where to find the power socket. Thai and international dishes like fish n’ chips (B240) and spaghetti meatball (B165) are available all day. Coffee starts from B90 for a hot latte and, if you want to change the mood, they also have Bavaria beer on tap.

Baan Rai Coffee
Corner of Sukhumvit Soi 63 (Ekkamai). Open daily 24 hrs.  
You might not think of Baan Rai Coffee as offering a work-friendly atmosphere, with its live bands performing daily and beer garden out front. But, who knew, the space on the second floor is pretty quiet for working and they also serve up 24-hour coffee and free wi-fi.    

Nikko Café
Ekkamai Soi 12, 02-381-5291. Open daily 1pm-12am. https://www.facebook.com/NikkoCafe
This very hip café underwent a little renovation on the front garden last year, which also saw it welcome a new cocktails list. The means this Japanese-inspired venue has more of a nightlife focus than before. But, still, the first-floor room and private room on the second floor are still very quiet and ideal for working.  

Maruey Library
MRT Queen Sirikit Exit 3, Ratchadapisek Rd., 02-229-2063-65. Open Sun-Thu 8:30am-11pm Fri-Sat 8:30am-12am.
Situated in the Stock Exchange of Thailand Building, Maruey Library is divided into two floors, the first where talking is allowed and the second for those seeking complete silence. The place offers plug sockets and is open every day, even on national holidays, with no entry fee.

Coffee Club
G/F Major Ekkamai, 1239 Sukhumvit Soi 63 (Ekkamai). 02-381-2736. Open daily; Sun-Thu 6:30am-10:30pm; Fri-Sat 6:30am-11:30pm.    
Australian coffee chain The Coffee Club last year opened its first branch in Bangkok on the corner of Soi Ekkamai. The bold and unfussy decoration gives it a café vibe, accentuated by dark furnishings and a high-ceiling, making it a comfortable spot to make the most of the free Wi-Fi. Coffee covers the likes of white (B95) and chai latte (coffee blended with spices, milk and cinnamon, B125). Beers are also available too.

Phayathai/Phaholyothin

My Café The Library
1/F Nawamin City Avenue, 30/20 Moo 4, Lad Prao. 02-907-2220.
The team behind My Café Sport Bar on Petchburi Soi 17 and My Hotel on Petchburi Soi 15, have now rolled out their third business, My Café The Library, in Nawamin City Avenue. Even though it's set in the mall, it's a 24-hour café which adopts a public library concept. The walls are lined with books that you can borrow and buy, while you can even sell your own here. The café offers coffee, bakery treats, Thai dishes and a special zone where you can come to work.

PH1b Coffee Bar
39 Soi Phaholyothin 11, 08-1339-0081, 08-1173-2600. Open Wed-Mon 9:00am-10pm.
Situated on the peaceful Soi Phaholyothin 11, this cafe is run by a group of friends who met in New York and looked to bring a slice of the coffee culture back to Bangkok. While it’s situated in a basement, the cafe has a definite NY loft feel. They concentrate on coffee, tea and handmade cakes but also serve up sandwiches and  salads. They recommend the Really Good Brownie (brownie with iBerry horlicks ice cream, B135) and their iced banana mocha (B105).

Treat
563 Phaholyothin Soi 32. 081-888-6446, 085-551-5333. Open daily 11:30am-11pm.  
The simply named Treat offers a vibe suitable for both a date and just hanging out on the weekend either in the conservatory or the garden strewn with bean bags. The décor features some beautiful dried flowers, while dishes include foie gras with mixed berry (B380), smoked apple salad with toast (B180). The long dessert menu spans banoffee in a jar (B70) to strawberry trifle (B145).

Quest
Phayathai Rd. 02-612-1442, 092-249-8313. BTS Phaya Thai. Open daily 6am-10pm.  
New coffee shop Quest does it all, from espresso (starting from B55) to cold drop (B60) and siphon (B80). Seat yourself at the bar and order a cup amid the rustic vibe of worn wood and bricks with a small garden on the side. A little hungry while you work? They also offer light bites like salads (from B85) and pastries (B90). The high-ceiling and rustic décor make it’s a comfortable place to work with your laptop, too.