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We are excited by the new Google satellite imagery for the Auckland area. This new view of our largest city is only weeks old, we’ve created a short Google Earth Tour of some of the apartment sites we at Envivo are working on click here.  We have plenty more in progress…

Deformation and Dilapidation Surveys – we measure land movement

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Envivo offers a full range of specialist structural engineering and surveying services including comprehensive dilapidation and condition surveys, deformation surveys, subsidence monitoring, precise monitoring surveys and installation of piezometers and ground monitoring stations.

The cost for a dilapidation report varies depending on the location and complexity of the project – but is well worth the investment to protect your interests. If you have any questions about the process or what it entails, our specialists are available to help. We are usually able to provide a quote for our services on the same day as your enquiry (depending on the complexity).

We have completed a wide range of dilapidation (defects) surveys and deformation monitoring throughout New Zealand, (naturally there was a huge inflow of work in Christchurch following the earthquakes) for;

  • Multi storey commercial and apartment developments
  • Heritage structures
  • Infrastructure, roads and rail tracks
  • Residential buildings
  • Dams, wharves, retaining walls
  • Cliff and Slip monitoring
  • Ground deformation monitoring
  • Construction sites

What is a Dilapidation Survey?

A dilapidation survey is an inspection of the structural condition of buildings and structures, usually undertaken before starting a development, construction, alterations or demolition.

What is a Deformation Survey?

Deformation monitoring and surveying is the systematic measurement and tracking over time of movement, which could apply to land, structures, infrastructure etc.

Why would I need a Dilapidation Survey or Deformation Monitoring?

We work with property owners, building developers and constructors; all of whom are interested in making sure that they have the right information to protect their investment and mitigate risk – or to rebut claims.

With Auckland experiencing a low to medium rise construction boom; particularly with the emergence of multiple 3-5 storey apartment blocks with one or two basement car parking levels being developed along the major arterial routs; it is important to undertake a risk assessment in terms of how the demolition and excavation may impact upon other buildings on the same site or neighbouring buildings, structures and roads in the vicinity.

What is the process for a Dilapidation Survey?

Prior to construction commencing our structural engineers together with a surveyor undertake an initial site walkover – and over neighbouring properties in the vicinity (with consent) to visually inspect structures on those properties and assess whether they may be in the zone of influence from the rock breaking, removal of support through basement excavation or vibration from mechanical sources during the excavation and site development.

Following this we return to the site and make a extensive photographic record of all visible existing damage and building defects, to establish monitoring marks and to undertake discrete survey measurement to understand the  condition, level and position of;

  • Surrounding buildings – interior and exterior, existing condition of walls, cladding, exposed foundations
  • Surrounding footpaths, roads and railway lines
  • Adjoining structures, retaining walls, foundations
  • infrastructure and service pits and infrastructure
  • Cornices and ceilings
  • Flooring and tiling

Detailed and more frequent assessments may be necessary if the adjacent buildings are constructed of unreinforced masonry, are old, or of such a design that they may have a higher risk level or when works are undertaken around particularly sensitive infrastructure e.g. train tracks in rail corridors where we may need to use dynamic monitoring systems to continuously feed results.

What is the process for Deformation Monitoring?

The production of a completed monitoring program and tabulation of results is frequently required to fulfil the conditions of Resource Consent with monitoring usually occurring at the following construction phases:

  • Demolition
  • Basement excavation and dewatering
  • Installation of retaining walls
  • On going during construction
  • Upon practical completion

Hugh Wyn-Harris, Envivo Surveyor, said “we set up a baseline survey control and then visit regularly to measure the same marks against the baseline to see if the land is moving.  The key thing is to repeat the surveys at regular intervals.  We measure in 1D, 2D and 3D using digital levels and high accuracy theodolites combined with digital levels. We provide a report which can be used for Council requirements, remediation works or site development and planning purposes.”

The dilapidation (defects) survey and deformation monitoring serve as a precautionary measure to protect constructors against any erroneous claims of property damage from third parties or provides property owners the evidence required to support a claim where damage may occur and to protect their investment.

The absence of a detailed report and survey exposes both to risk.

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