CRUCIS DESIGNS carries out civil and structural engineering design for projects ranging in size from individual beams, to domestic extensions and multi-million pound mixed-use developments. We also provide structural reports for issues ranging from subsidence to solar panel installations.

All structural engineering projects are bespoke and our engineers are ready and available to talk through your project and provide you with a quotation tailored to your needs. Please contact us on ​Tel. 01702 416114 or Email. [email protected]

Alternatively CRUCIS DESIGNS can also provide an automatic online quotation for specific domestic / residential projects as listed below:
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  • Design of 1-3 steel beams for removal of internal / external walls.
  • Design of rectangular single storey rear extensions.
  • Design of gable ended single storey rear extensions.
  • Design of box dormer loft conversions.

If you would like an online quotation please scroll down to see more.

Online Quotation - Domestic / Residential Properties - ​​How it Works

Our online quotations are intended for work to domestic / residential properties of standard construction (masonry buildings with timber floors and pitched roofs).
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Almost all our work will start with one of our engineers coming out to survey your property; this step allows us to look at the individual nature of your project, to discuss your requirements and to tailor our design work to your needs.

​If you don’t think your work falls within the scope of the projects described below, please contact us directly and we can provide you with a quotation  tailored to your individual needs.
A standard UK domestic / residential property is a terraced, semi-detached or detached house with masonry walls timber floors and a pitched roof.

Option 1 - Beams for Removal of Existing Walls ​- Online Quotation

​Typical Form

  • Design of 1-3 steel beams for removal of internal / external masonry walls.​
Design Services

  • Structural engineer's survey.
  • ​Design of new beams.
  • Assessment of capacity of existing walls & foundation.
  • ​Production of sketch drawings and supporting calculations.​

Option 2 - Rectangular Single Storey Extensions - Online Quotation

​Typical Form
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  • Rectangular single storey extension with masonry walls.
  • Up to about 8m x 5m in area.
  • One large opening to rear for bifold or sliding doors.
  • One large rooflight or several smaller rooflights.
  • Removal of part of the existing rear wall to join the new extension to the  ​existing building.
Design Services
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  • Structural engineer's survey.
  • Design of foundations.
  • Design of walls, floors and roofs.
  • Design of new steel beams and skylight trimmers.
  • Production of structural details and drawings.
  • Production of structural calculations.

Option 3 - Gable Ended Single Storey Extensions​ - Online Quotation

​Typical Form
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  • Single storey extension with pitched roof.
  • Up to about 8m x 5m in area.
  • Triangular end glazing as doors / windows.
  • ​Removal of part of the existing rear wall to join the new extension to the  ​existing building.
Design Services
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  • Structural engineer's survey.
  • Design of foundations.
  • Design of walls, floors and roofs.
  • Design of new steel beams and cranked steelwork over triangular glazing.
  • Production of structural details and drawings.
  • Production of structural calculations.

Option 4 - Box Dormer Lofts - Online Quotation

​Typical Form
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  • Box dormer across back of roof.
  • If hipped; extension of hip roof to form new gable end.
  • Retention of existing timber rafters to front.
  • Retention of ceiling strengthened as required.
Design Services
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  • Structural engineer's survey.
  • Design of new steel and timber structure for loft conversion.
  • Assessment of capacity of existing walls & foundations.
  • Production of structural details and drawings.
  • Production of structural calculations.

Option 5 - Loft & Rectangular Single Storey Extension - Online Quotation

​Typical Form​​
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  • Box dormer across back of roof.
  • Rectangular single storey extension with masonry walls.​
Design Services
​
  • Design of timber and steel structure for new loft conversion (see D above for details).
  • ​Design of new masonry extension (see B above for details).
  • Production of structural details and drawings.
  • Production of structural calculations.

Option 5 - Loft & Gable Ended Single Storey Extension - Online Quotation

​Typical Form​​
​
  • Box dormer across back of roof.
  • Gable ended single storey extension with masonry walls.​
Design Services
​
  • Design of timber and steel structure for new loft conversion (see D above for details).
  • ​Design of new masonry extension (see C above for details).
  • Production of structural details and drawings.
  • Production of structural calculations.

What Else Might I Need

CRUCIS DESIGNS have based our automatic online quotes on the form of construction we find most common for domestic / residential properties, but as each design is bespoke there may be site specific additional requirements. Our engineers will be able to advise once they have been to site / discussed the project with you.

The most common additional requirements are:
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  • Piled Foundations: The requirement for this type of foundation is largely driven by the proximity of trees close to the property, the nature of the soils below the property and the form of the existing foundations.
  • Portal Frames: If a very large proportion of the existing rear wall of a property is removed, this can affect the stability of the building and a steel goal post frame will be required to maintain overall stability; a similar frame can also be required for some extensions where only a very small amount of masonry is to be provided on the new rear elevation.
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