Geothermal borehole drilling: compare quotes and prices

Drilling and complete heating are different orders

A borehole alone is not a usable heat source. The probe is installed, the borehole appropriately grouted and the probe checked. Its pipes then need to reach the agreed handover point. Heat pump, heat distribution and electrical work are not automatically part of drilling cost.

Distinguish new probes, adding to an existing system and initial feasibility assessment. Extension needs checking compatibility with existing probes and equipment. Assessment and execution should be agreed as separate scopes of work.

Feasibility starts at the actual property

Ground conditions, groundwater protection and local restrictions affect whether and how drilling can proceed. Neighbouring installations, infrastructure and possible depth limits also matter. A general indication for the town does not replace assessment of the intended position.

Geothermal maps provide initial information. They are not an issued permit or assurance that every intended depth is achievable. The applicable cantonal and municipal procedure needs clarifying for the project. Agree who prepares documents and coordinates necessary assessments.

Numbers and depth follow professional sizing

Building heat demand, intended use and ground characteristics influence the source. Heating, hot water and possible cooling need designing together with the heat pump. Floor area alone cannot reliably establish a fixed drilling depth.

Several shorter probes are not automatically interchangeable with one deeper probe. Position, layout, mutual influences and permitted depth need assessment. Known design facts help quotes; where missing, sizing first belongs in the professional scope. Customers do not need to determine extraction capacity or ground classification themselves.

Discuss access and the drilling area early

Drilling equipment, support vehicles and materials need suitable access and working space. Gardens, narrow forecourts and open construction sites have different requirements. Before firm execution, the business checks access, positioning and preparatory work. Claiming every garden suits every machine would be unreliable.

Surfaces, known utilities and nearby structures need considering in site organisation. The business determines necessary protection and working measures. Extra excavation, lifting equipment or special preparation need identifying in the scope.

• Location. Describe intended area and access through the property or construction site.
• Existing work. Consider known plans and existing probes if present.
• Surface. Describe garden, paving or construction area and clarify intended reinstatement.
• Organisation. Coordinate drilling and connection work with the businesses involved.

Plan connections and reinstatement to the interface

Trenches, connecting pipes, a manifold and building penetrations may be needed between probe and heat pump. Routing influences work and later accessibility. Define where the order ends: probe head, manifold, plant room or another expressly agreed interface.

Excavation, backfilling, sealing building entry and restoring surfaces are not universally included. A compacted trench is not a fully restored forecourt. Also agree who connects to the heating system and carries out complete commissioning.

Consider probe, grouting and documents together

The drilling method is selected for geology and intended probe. Grouting around the probe performs an important role in the finished borehole. Material, installation and required evidence belong in professional execution; customers should not confirm unplanned methods or materials.

Agreed checks and documents make completed work traceable. They may include borehole profile, probe details, test records and filling or connection documents. Clarify what you and the heating contractor receive. A documented probe does not mean the entire heating system is already commissioned.

Clarify drilling water, changes and responsibility

Drilling may produce water and drilling sludge. Collection, treatment and disposal must suit location, material and local requirements. Agree responsibility and included work; arbitrary discharge or spreading around the property is not an appropriate blanket solution.

Actual ground encountered can require adjustments. Ask how changed depth, extra work or an unworkable section will be handled. Communication, responsibilities and cost consequences should be understandable beforehand. Insurance cover and exclusions vary; a quote does not automatically provide unlimited protection against every risk.

Drilled metres are only part of cost comparison

Number, depth, geology and site logistics influence price. Probes, grouting, checks, connecting pipes and possible design add to this. A per-metre price with unclear contents does not fully compare a source ready to connect.

Compare the same assumptions and handover points. Fixed and variable items, open extras, VAT and change conditions should be visible. Without comparable design and complete scope, general examples do not establish a reliable Swiss average.

Treat heat-pump and other heating-conversion costs separately if not offered. Funding conditions and possible contributions need clarifying for the actual complete project. A probe quote alone guarantees neither funding nor a particular future electricity bill.

From property to a usable heat source

Start with location and intended heat supply. Design, procedure and required project documents are then coordinated. Execution can only be reliably scheduled after necessary assessments.

Completion includes the agreed source and clear handover to further building services. Retain documents for operation, changes and support. Extending existing probes also requires suitable connection and use.

• Assess. Have property, use and conditions examined.
• Agree. Define sizing, interfaces, price items and responsibilities.
• Coordinate. Organise procedures, drilling site and connections.
• Receive. Obtain completed probes, checks and agreed documentation.