XT PHAYATHAI
XT PHAYATHAI is a completed Sansiri condominium on Si Ayutthaya Road in Ratchathewi, positioned between the Phaya Thai transport hub, Victory Monument and the central Bangkok retail districts.
BangkokBased on developer material

From 4,350,000 THBPer broker listings. Current price list, layouts and availability — discussed one-to-one with a project specialist
Quick — 10-second read
- What it is
- Condominium
- Where
- 515 Si Ayutthaya Road, Thanon Phaya Thai, Ratchathewi, Bangkok 10400, Thailand · Bangkok
- Stage
- Completed · 2023
- Price
- From ฿4,350,000guide price, final by unit
- Transparency
- 9 facts confirmed · 3 to verify
Who is behind this project
- Developer
- SansiriPublic company · SIRIOpen developer profile →
- Track record
- Sansiri’s corporate timeline gives a useful picture of how the business evolved.Company data; check the specific project independently.
- Projects with us
- 69
- Transparency
- Public reporting (SIRI) — independently checkable
Brand ≠ the legal entity signing your contract. This project may use a separate project company or joint venture — verify the seller and developer for the selected unit.
Why this project is worth a look
Rail connections matter
Phaya Thai combines BTS with the Airport Rail Link, and the project sits within walking reach of that interchange. For an owner who commutes across central Bangkok or travels frequently, this can be more useful than being slightly closer to a single-line station.
You can inspect reality
The project is complete, so the decision can be based on the actual apartment, tower, corridor, view and common areas. Due diligence shifts away from construction delivery and toward title, seller documents, maintenance history and the condition of the selected resale unit.
Facilities have depth
The shared-space programme goes well beyond a pool and gym, with work areas, meeting rooms, a library, co-kitchen, co-living and recreation zones across several levels. That is most valuable to residents who expect to use the building as part of their daily routine rather than as a place to sleep only.
Layouts cover real needs
The developer’s original mix spans compact one-bedroom homes through larger two-bedroom apartments above 80 sqm. Buyers can therefore choose between lower entry cost, more generous one-bedroom living or family-sized space without leaving the same transport location.
Resale choice is broad
Dozens of units are marketed at the same time across major portals, which gives buyers leverage to compare stock. The trade-off is that asking prices can be noisy, so the best-looking number should be checked against floor, view, condition, tenancy and ownership quota before it becomes the anchor for a decision.
About the project
XT PHAYATHAI is a completed Sansiri condominium on Si Ayutthaya Road in Ratchathewi, positioned between the Phaya Thai transport hub, Victory Monument and the central Bangkok retail districts. It is a large two-tower scheme rather than a boutique residence: Tower A rises to 41 storeys and Tower B to 37. The scheme contains 1,435 residential units plus one commercial unit, which explains why some references describe 1,435 homes while others show 1,436 total premises. For a resale buyer, the main advantage is simple: the buildings, common areas and individual apartments can be inspected as they exist today rather than judged from renderings.
The location is strongest for people who actually move around Bangkok. Phaya Thai BTS and the Airport Rail Link interchange are within walking reach, giving a direct rail connection toward Siam and the Sukhumvit corridor as well as Suvarnabhumi Airport. Phyathai 1 Hospital is close to the site, and the project sits on a major east-west road rather than deep inside a residential soi. That makes daily transport straightforward, but it also means this is an urban address. A buyer looking for a quiet, low-traffic residential enclave should assess the chosen orientation and floor rather than assuming every unit will feel equally calm.
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Scale shapes the living experience. With 1,435 homes, XT PHAYATHAI has the density of a substantial vertical community, and the shared facilities were designed accordingly. The project provides a workspace lobby, library and meeting rooms, co-kitchen and co-living areas, a theatre room, laundry facilities, landscaped recreation zones on several levels, swimming facilities with a jacuzzi and children’s pool, exercise spaces, EV charging, CCTV and 24-hour security. The value proposition is therefore not exclusivity through low unit count; it is access to a broad set of spaces that can reduce the need to leave the building for work, exercise or informal meetings.
The original residential mix is clearer than many resale portals make it appear. The original developer mix grouped one-bedroom homes into 25.25–33.75 sqm and 40.50–49.75 sqm ranges, while two-bedroom homes were offered at 61.00–74.75 sqm and 82.25–101.00 sqm, with two bathrooms in both two-bedroom ranges. This creates very different use cases inside the same project. The smallest one-bedroom apartments are compact city units; the 40-plus-sqm one-bedrooms give noticeably more separation between living and sleeping space; the larger two-bedroom layouts can work for couples, families or buyers who need a proper second room rather than a token study.
The resale market is deep enough to compare rather than compromise immediately. Major portals showed roughly 80 or more sale listings at the same time in early September 2026. That breadth is useful because tower, floor, view, fit-out, tenant status and ownership quota can all be compared. It also means buyers should not anchor to an asking price without checking the surrounding stock. A THB 4.35M one-bedroom listing updated on 4 September 2026 is a lower market reference, not a statement that similar units should all trade at that level.
Running costs are relatively transparent in the major project databases. Available project data states a common-area fee of THB 40 per sqm per month and a THB 500 per sqm sinking fund. Those figures help with ownership budgeting, but a resale transaction still needs a unit-level ledger: outstanding common fees, any special assessments, the handover condition, what furniture is included, and whether a tenant remains in possession can all change the economics of an apparently similar listing.
Foreign ownership also has to be checked unit by unit. Thai condominium law allows qualifying foreign buyers to own condominium space freehold within the statutory 49% foreign quota. XT PHAYATHAI resale advertisements show both foreign-quota and Thai-quota units, so project eligibility does not make every apartment immediately transferable to a foreign buyer. Before paying a non-refundable deposit, the buyer should confirm quota availability with the condominium juristic person and review the title deed, seller identity, encumbrances and payment route for the selected unit.
Gallery
Photographs from the project’s materials.
Ownership format
A foreign buyer may hold a condominium unit freehold within the statutory foreign-ownership quota, capped at 49% of the aggregate unit area in the registered condominium. If foreign quota is unavailable for the selected unit, foreign freehold cannot be transferred and any leasehold alternative should be assessed separately. For an XT PHAYATHAI resale unit, quota availability and the juristic-person confirmation required for transfer should be checked before committing.
Unit types & sizes
The smallest developer-defined range. Current resale stock includes homes around 32–34 sqm, making this the natural entry point for a single resident or couple who values the central transport location more than generous internal space.
A materially larger one-bedroom category. The extra space changes how the apartment works day to day: it is easier to create a proper living area, storage and a work zone without paying for a second bedroom that may not be needed.
The smaller two-bedroom range in the original factsheet. Two bathrooms make it more workable for a small family, two adult occupants or an owner who wants a genuine office or guest room without turning the living room into a flexible space.
The largest standard category in the original developer mix. At this size the apartment can function as a primary home rather than a compact city base, but the 82–101 sqm range is wide enough that buyers should compare the actual plan, orientation and tower position rather than relying on area alone.
The original developer mix defines one- and two-bedroom ranges. Current resale portals also market some roughly 100–101 sqm apartments as three-bedroom units; because that type is absent from the developer factsheet, the registered configuration should be verified for the specific unit. Prices are the lowest the brokerage boards publish, not the developer’s price list — the price and availability of a specific unit are something we go through with you personally.
Facilities
20 amenities
Work and social
- workspace lobby
- library
- meeting rooms
- co-kitchen
- co-living area
- theatre room
Fitness and pools
- swimming pool
- jacuzzi
- kids pool
- underwater exercise equipment
- fitness rooms
Gardens and recreation
- landscaped outdoor recreation areas on several levels
- rooftop recreation areas
Daily services
- self-service laundry
- wireless internet in common areas
- EV charging
- shuttle service
Security
- 24-hour security
- CCTV
- access control
How the tower is arranged
- Tower A — 41 storeysHigh-rise residential tower; The upper level includes the pool, lounge and meeting space.
- Tower B — 37 storeysSecond residential tower; The 37th floor includes the fitness facility.
- Ground, 8th, 11th, 16th, 28th and rooftop levelsGardens and outdoor recreation areas are distributed across these levels.
Location
- Si Ayutthaya Road in Thanon Phaya Thai, Ratchathewi, places the project between the Phaya Thai interchange and Victory Monument.
- Phaya Thai BTS and the Airport Rail Link interchange are within walking reach according to current project and listing sources.
- Phyathai 1 Hospital is immediately nearby and serves as a practical landmark for the address.
- Rail connections make Siam, the Sukhumvit corridor and the airport direction straightforward without relying on a car for every trip.
- The building fronts a major urban road, so view, traffic exposure and window orientation should be checked at unit level.
Address / landmark515 Si Ayutthaya Road, Thanon Phaya Thai, Ratchathewi, Bangkok 10400, Thailand
The map loads from OpenStreetMap on request.
The circle shows the project’s approximate location; we confirm the exact address and the plot boundaries when you get in touch. © OpenStreetMap contributors.
Price & purchase terms
- Current price: From THB 4.35M in an active PropertyHub resale listing updated on 4 September 2026. This is a lower resale-market anchor, not a developer price; availability, condition, ownership quota and transaction terms need to be checked for the selected unit.
- Completed: 2023
We show the lowest of the prices the brokerage boards publish: their figures for the same unit differ by a few per cent, and none of them is the developer’s price list. We ask the developer for the current price, availability and payment terms on the unit you are looking at, and go through them with you personally.
Project stage — what we know
Completed in 2023. Not a render.
Visit in person and see the real units; resale and rentals exist.
- Planned
- Building
- Done
Transparency index
Facts already published on this page and points we clarify together.
The project has 9 documented key facts; 3 items are clarified before booking.
We count facts already published on this page. The index does not assess the project’s quality.
At a glance
Similar options nearby and in budget
Compare before you decide — same area and price level.
High-rise residential condominium · Under constructionNiche Pride Ekkamai
Completed high-rise loft-duplex condominium · CompletedChewathai Residence Asoke
3-storey townhome community · Under constructionFlora Ratchaphruek–Suanphak
Is this project right for you?
Tick what describes you — we will show whether this may be a fit. Honest, without gloss.
Your selections are not saved anywhere. This is a decision aid, not an assessment.
Best for: Residents who want central Bangkok rail access with both BTS and Airport Rail Link connectivity.; Resale buyers who prefer inspecting a finished building and actual unit before taking material construction risk.; People who will genuinely use co-working, meeting, fitness, pool and social facilities rather than paying for amenities they rarely visit.; Buyers who value a broad resale pool and want to compare tower, floor, view, fit-out and size within one address.; Foreign buyers who are comfortable treating ownership quota as a unit-level due-diligence item rather than a project-wide assumption.; may not suit: Buyers seeking a quiet boutique building with a small resident population; 1,435 homes make this a large community.; Anyone who prioritises a secluded residential setting over transport convenience, because the project sits on a busy central road and exposure varies by unit.; Pet owners, as major project databases currently report that pets are not allowed; the latest juristic-person rules should be checked before purchase.; Foreign buyers who expect every resale listing to be immediately available in the foreign quota..
What we confirm before booking
A short, specific to the project list. We request these from the developer and go through them with you before any payment.
- the legal entity in the SPA and the payee’s bank details
- the title format and what is registered against the unit
- the contractual handover date in the SPA — the page shows the date from the project’s materials
- the contractual area of the chosen unit, and which basis it is measured on
Disputed and unknown information
This keeps the open points in one place. A missing or disputed fact is not treated as a conclusion.
- Completion-year sources conflict: Sansiri’s current project page and PropertyHub state 2023, while some FazWaz records and agency pages show 2022. The registry uses 2023 because it is supported by the current primary source.
- Third-party sources disagree on the civic number: several current local references use 515 Si Ayutthaya Road, while some agency pages use 511. Sansiri confirms the street but does not publish the number on the current page; both references point to the same mapped complex.
- Sansiri’s original brochure lists only one- and two-bedroom standard types, while resale portals currently market some roughly 100–101 sqm homes as three-bedroom units. The registered configuration of such a unit needs document-level verification.
FAQ
What does a unit in XT PHAYATHAI cost?
From 4,350,000 THB — per broker listings. Prices are the lowest the brokerage boards publish, not the developer’s price list — the price and availability of a specific unit are something we go through with you personally.
When is XT PHAYATHAI due for completion?
2023. The contractual handover date is fixed in the SPA.
Sources and documents
Official developer and public records used for this page. We publish no outbound links.
- Developer's official site checked 05.09.2026
- Government / official registry checked 05.09.2026
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Mark Erometskiy
Thailand property expert (Pattaya, Phuket and Bangkok), co-founder of Bomi Home. Will help with the unit, ownership, stage and terms before you decide.
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