SPN Soil Engineering Co., Ltd. provides end-to-end geotechnical and civil engineering services: soil boring, field and laboratory soil testing, pile testing (PDA, Static Load, Seismic), structural testing (NDT, Floor Load Test), topographic survey and instrumentation, through to foundation and civil design, per ASTM and DPT standards. Our engineering team has over 20 years of experience, and reports are certified by a licensed engineer, usable for building-permit submissions.
From soil investigation, pile testing, topographic survey and instrumentation to structural testing, environmental assessment, and geotechnical and civil design. Click a test name to see details of each method.
Soil and rock boring, field and laboratory soil testing, with geotechnical reports certified by a licensed engineer
Testing pile capacity and integrity under compression, tension (uplift) and lateral loads
Topographic survey, construction setting-out, river and sea bathymetry, and drone aerial photography
View all services →Monitoring settlement, pore water pressure and movement of soil and structures during construction
Inspecting existing structures, assessing concrete strength, locating voids and rebar, and floor load testing
View all services →Installing monitoring wells, sampling soil and groundwater, and supporting EIA reports
Foundation and retaining wall design, soft ground improvement, and slope stability analysis
View all services →Structural, drainage and road design, forensic engineering, and design certification by a licensed engineer
Services commonly used for each project type, with articles to help you plan before requesting a quote
Soil boring before building, foundation design for extensions that will not settle, and crack inspection
Deep soil boring, bored pile testing, and excavation monitoring instruments
Soil checks before buying land, and floor assessment for storage racks and forklifts
Uplift and lateral pile load tests, and soil resistivity for electrical systems
Soil boring from a raft or barge, bathymetric survey, and riverbank protection design
Bridge load tests, pavement layer tests, and concrete road design
Strength checks of old buildings before purchase, extension, or after an earthquake
Slope stability analysis, and retaining wall design on soft clay and steep ground
Examples of actual SPN projects, from the problem and test method to reading the results
2 piles tested; pile toes found at about 23 m, compared with 30 m deep soil boring on the same project
32 cm RC slab, load held 24 hrs, deflection 0.50 mm, passed ACI 318-19 Chapter 27 criteria
Installing casings, periodic readings, and interpreting sheet pile movement plots against alert levels
Installing borehole BH-1 and reading the break point of the plot to locate the slip plane of the slope
Deep Settlement Points installed in soft clay to separate the settlement of each soil layer
Long-term groundwater level monitoring, with installation, reading and interpretation of both instrument types
Other case studies: Over-water and offshore soil boring · Temporary earth retaining system, 4 m deep excavation, Khon Kaen · Cut and fill on a hillside slope · Retaining wall on soft clay
We work in every area and environment: on land, in rivers and at sea, at dams, factories, industrial estates and special sites
Field teams work nationwide from our Bang Sao Thong office in Samut Prakan, covering soil investigation, pile testing and structural testing. Darker provinces have more jobs.
View all our work: Projects by industry (1,725 jobs · 77 provinces) · Our clients: 610+ organizations
Every report carries a professional engineering license and can be used right away for building-permit submissions
Experience on every project type: houses, factories and infrastructure View SPN Group company history →
Our team and equipment are ready to travel to every province
Testing follows international ASTM standards and the relevant DPT standards of the Department of Public Works and Town and Country Planning for each method
Quotation within 24 hours
Team and equipment mobilized to site
Per ASTM / DPT standards
Lab testing · engineering analysis
Certified by a licensed engineer
Reports are certified by a COE-licensed civil engineer, with the engineer's signature and registration number, and can be used right away for building-permit submissions and other relevant agencies.
The price depends on 3 things: the number of boreholes, the site area, and the depth (we must drill down to a truly firm layer), so every project is different. See the detailed price table in Soil Boring Price 2026, or request a free quotation, sent within 24 hours.
The price depends on the test method (Seismic is the most economical · Dynamic/PDA · Static costs the most, depending on the test load) and the number of piles tested. See details in Pile Test Price 2026, or request a free quotation, sent within 24 hours.
We work nationwide across all 77 provinces of Thailand, including offshore work. Our team travels with a full equipment set. Contact us for a cost estimate.
Our head office is at 55/10 Moo 3, Si Sa Chorakhe Noi, Bang Sao Thong, Samut Prakan 10570. We work nationwide across all 77 provinces of Thailand, including offshore work, and our team travels with a full equipment set. Office hours: Mon–Sat 08:00–17:00.
Soil boring takes about 1–2 days of field work per borehole, with a report certified by a licensed engineer within 7–14 working days. For pile testing, PDA covers about 5–10 points per day on site, and a Static Load Test takes about 3–7 days on site per pile. Both methods come with a certified report within a few working days after testing.
Send the site location or coordinates, the building type or construction drawings (if available), and the tests you need, such as the number of boreholes, the number of piles to test, or the area to inspect. Send them via LINE @spnth or email info@spnth.com. Our engineers will send a quotation within 24 hours.
Yes. We do both non-destructive structural testing (Rebound Hammer, UPV, GPR rebar scanning, Core Test) and floor load tests per ACI 318-19 Chapter 27, for existing buildings planned for extension, change of use, or installation of machinery and storage racks.
Price table by building type, the factors that set the price, and ways to save
Read more → PriceCost comparison of each method, and the factors that make prices differ
Read more → PriceHow prices are set, comparing Rebound Hammer, UPV, GPR, Core Test and Floor Load Test
Read more → GuideWhat Seismic, PDA and Static Load Tests measure, how they differ, and which to choose
Read more → GuideGuidelines for setting the number and depth of boreholes by building type
Read more → RegulationNumber of boring points, and safety factors for foundations, piles and retaining walls that project owners must know
Read more →Contact our engineering team for a quotation within 24 hours, with expert advice at no cost
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