Frequently asked questions

Everything you need to know

How much does a measured building survey cost?

Key variables that effect the price are the type and size of building and suitability of access for obtaining measurements. Time will also be allotted to the drawings that are required (outline vs detailed, full set of plans/elevations/sections vs partial plans) along with any additional requirements. Please use our Quick Quote tool to request a price for your specific site and survey requirements.

Where do you work?

We work nationally, most commonly in Nottinghamshire, Derbyshire, Leicestershire, Lincolnshire, Rutland, Staffordshire, Northamptonshire & South Yorkshire. Thanks to our online nature, efficient workflows and low overheads, we have successfully won topographic land and boundary surveys & measured building survey projects all over mainland UK

Can I see sample work?

Please go to our Services page to view samples of the type of survey you are interested in. Many projects are ongoing and sensitive in nature, so please get in touch if you don't see what you are looking for and we can prepare a relevant sample that does not jeapordise other clients' sensitive information.

I have an urgent deadline; can you meet it?

Our standard lead in time for measured building surveys is 1-2 weeks with a further 1 week to produce drawings but we will accommodate small jobs with a quick turnaround where possible.

What files are included in the survey?

Where as we survey most buildings in 3D, most measured building survey deliverables are required in 2D format only. We will typically supply a 2D CAD file of the measured building survey, pdf plots of the floor plans, elevations and sections and a link to access the 3d laser scanned pointcloud, where relevant. Ultimately we will customise our proposal to your specification and we can provide data in a wide range of formats.

What is Ordnance Survey mapping?

Existing mapping of the wider area can provide context to your topographical or measured building survey, but it is not compulsory. We’ll sometimes display it in the background, usually coloured in light grey. For boundary surveys, this is usually required to meet Land Registry requirements. Any costs for additional data will be itemised in the quote.

What is "Survey Grid & Height"?

Otherwise known as a coordinate reference system. For most surveys, the survey should relate to the Ordnance Survey National Grid. If you’re adding to or checking an historic survey, then please upload/email your existing survey so that we can review the best way forward. If a topographic survey has already been undertaken of the site the building sits on, it is usually sensible to carry out the measured building survey within the same coordinate system and use the same survey control points. This ensures the position of the building and levels accurate to the existing site survey.

How do I upload more than one file to a Quick Quote?

Existing plans, photographs and proposal plans are all useful along with a plan of the survey area required, Please combine all files into a single file. You can do this by creating a .zip file. 1. Place all the relevant files in a folder together on your computer. 2. Select them with CTRL + left click or SHIFT+ left click. 3. Right click on any of the files and locate the option “Send to > Compressed (zipped) folder”. Upload the .zip file.

Which layering system do you use?

We have developed an easy to manipulate and optimally fragmented layering system for ease of use by architects and engineers using standard CAD. For public sector projects we have a BIM compliant system. Please advise us of any specific cad format requirements at the quote stage.

What is the camera or video symbol on my survey?

The viewpoint symbol contains a link to a photo or video file. Hover your mouse over the viewpoint, hold CTRL on your keyboard and left click on your mouse to open the file. Remember to keep all the files in the folder structure we sent or the image files and other external references such as base mapping will require re-linking.

Do you provide volumes and areas of buildings measured.

Yes where this is required in advance, we can ensure that sufficient measurements are taken in order to compartmentalise your building areas according to the required measurement basis. For example, Gross and Net internal/external areas, massing volumes and zoning calculations.

Can you provide setting out services?

Yes. We are trained and insured to perform setting out. Please email or upload (Quick Quote) your coordinate file/design drawing. Let us know about any material usage or reporting required and we'll get back to you with a competitive quote. View our Services page for more information.

Is your survey equipment calibrated?

Our Leica equipment is regularly calibrated by independent, Leica qualified technicians. On site checks are made each day to ensure equipment is functioning within tolerances. Calibration certificates can be provided for equipment used on your project.

How accurate is a measured survey (absolute accuracy)?

Absolutely accuracy refers to how accurate a survey measurement is - within a specific coordinate system. For example, when assessing the coordinates of 4 building corners against 4 known coordinates for the corners.

How accurate is a measured building survey (relative accuracy)?

Relative accuracy refers to how accurate the survey measurements are in relation to each other. For example, the building could be (absolutely) in the wrong place, yet the relative accuracy of the internal points of the survey could be correct to within +/- 10mm (RICS band D - 1 sigma)

Are precision and accuracy just the same thing?

Imagine stopping to ask somebody for directions and being told "just keep going for 5 miles". To be safe, you then wait for another passer by and check with them. They say "It's 4.32 miles ahead". When you get there, you check the odometer and it reads 5.13 miles. The first helper was quite accurate, but not very precise. The second helper gave a very precise distance, but it wasn't accurate. An accurate AND precise answer would have been "it's 5.13 miles ahead".

What is survey adjustment?

Survey data is rarely delivered without some adjustment to provide a best estimate on final coordinates. The Bowditch and Least Squares method are commonly applied in land and measured buildingsurveying.

What is aerial photography?

This can range from historic aerial photography which can be used as evidence in a boundary survey, to high resolution drone survey images and video, which can be processed into 3d maps, models, orthophotos and roof plans.

What is a survey bench mark?

Benchmarks are an antiquated network of permanent marks/markers positioned around the UK to provide a reference height above Ordnance Survey Datum (mean sea level). Since the advent of GPS technology, these are longer updated or maintained - however the historic height values can still be obtained.

What is survey control and permanent ground markers?

Survey control points, together referred to as the control network, are the most precisely measured points during a survey. Usually marked permanently with pins, nails, stakes and spray paint, these accurate points have precise coordinates which allow the survey to be revisited for future works and checked for accuracy.

What is a control survey?

Most surveys will incorporate some control, but a control survey is only concerned with establishing a robust and well referenced control network for other survey works to be carried out from. Recommended as a first step for larger sites and areas, this ensures an adequate framework is installed before hundreds of hours are invested in carrying out detail survey works (mapping the features).

What are survey coordinates?

Coordinates in surveying are typically 2 number strings (X & Y axis) or 3 number strings (X, Y & Z) which describe the spatial position and/or elevation or height of a point, within a coordinate reference system. The national system for Great Britain is called OSGB36 for the X (easting) and Y (Northing) axis, with orthometric heights relative to Ordnance Datum Newlyn (Mean Sea Level)

What does Datum mean?

A datum is a reference point or surface. Heights (elevations) of other points on the map or survey are relative to the datum. Most surveys in mainland UK use mean sea level as a 0.00 datum, so a level of 50.00 means 50 meters above mean sea level. Local arbitrary datums are sometimes used instead, such as a finished floor level or a man hole cover frame.

Is Earth round and how does curvature effect my survey?

Yes Earth is "round". Though this generally only becomes relevant when surveying large areas - when this curvature may need to be accounted for, depending on the purpose of the survey. Measured building surveys will typically ignore curvature as the distances involved result in such small discrepancies.

What is an elevation drawing?

An elevation is the height of a feature in land surveying, usually above mean sea level. However an elevation drawing typically means a building façade drawing, often shortened to "elevation" by architects and planning professionals. Elevation drawings show the facade of a building to scale, with accurate heights of features such as windows, doors and roof details. These are commonly used to document and record the existing building, plan refurbishment works and inform designers/architects when producing proposal drawings for planning applications.

What sort of survey errors can occur?

Surveyors are now blessed with an abundance of technological advancements - but a good understanding of the source of errors is still paramount to delivering accurate and reliable survey data. These sometimes carry different names, but include natural errors (e.g. atmosphere,refraction), Instrumental errors (incorrect calibration of equipment) and human errors (e.g. poor vision). These must all be accounted for appropriately depending on the accuracy requirements of the project. Blunders, or Gross Errors are essentially mistakes often caused by fatigue or inexperience. They are typically the most catastrophic, due to their often large size but this also makes them very easy to spot with sufficient quality control procedures.

What is meant by first registration?

First registration is an application process required by Land Registry when a conveyance is prepared for land that is previously unregistered. A title plan may need to be produced by a land or boundary surveyor, depending on what historic evidence is available.

What is the formation level?

The formation level in construction, is the surface where excavation is completed and construction can begin, usually starting with the sub base layer. A typical greenfield site will require a top soil strip and reduced level dig (cut) or fill to reach the formation level. Some groundworks contracts include the initial stages of construction as part of the works. Land surveyors and setting out engineers help to achieve the correct cut and fill of a site and provide volumes and calculations for quantity survey control. On larger sites, much of this work is now carried out by machine control.

What does general boundary on my Land Registry title plan mean?

A general boundary is used on the majority of Land Registry Title Plans. It is accompanied with a disclaimer and means that the red line does not indicate where the legal boundary is exactly, rather that the legal boundary is in the general vicinity of the red line general boundary.

What is GPS/GNSS in land surveying?

GPS is a type of Global Navigation Satellite System. A number of such systems now exist as more satellites are launched by different organisations each year. Land Surveyors use this technology to achieve accurate measurements where there is a clear view to satellites and to establish the elevation of a site above mean sea level.

What is the hedge and ditch rule for boundary surveys?

The hedge and ditch rule implies that where a hedge lies between land and a ditch, the ditch also belongs to the owner of the land. The underlying premise is that the current (or a previous) landowner dug the ditch immediately adjacent to the boundary line and planted a hedge on the excavated soil deposited within their own parcel. This is a simplified example and many other factors may come into play in determining if this rule can apply.

What is levelling?

Levelling refers to measuring or setting the elevation or height of control points, relative to the datum. On a typical topographical survey or measured building survey, the accuracy of a modern total station is sufficient to set these elevations. For higher order accuracy work, such as large control networks, monitoring or simply where planimetric (X/Y) control is not required, "hard levelling" with a digital or optical level and graduated staff is used to complete a level loop. Obtaining a grid of spot heights, or levels over an area of land or concrete, may also be referred to as "levelling" the area.

What is local scale factor?

Local scale factor is a multiplier that is applied to survey measurements on some surveys, to respect the curvature of the earth, within the projection/coordinate system/grid being used.

What is a monitoring survey?

A monitoring project will typically consist of an initial installation of a control network placed on stable monuments outside of the area of interest. This is followed by careful installation and recording of the position and height of monitoring points. These are placed on features of interest within the monitoring area, or the entire monitoring area will be scanned with a 3d scanner. A series of subsequent monitoring surveys are carried out at prescribed intervals to repeat the measurement process and monitor changes in coordinates, representing movement and deflection.

How is photogrammetry used by land and measured building surveyors?

Photogrammetry is the process of image capture and processing to allow measurements to be taken from photographs. Commonly used at ground level for building facades and aerially from camera equipped drones, a number of survey and mapping tasks can be completed or benefited by this method.

What is an orthophoto?

An orthophoto is an output of photogrammetry - an image is created from several ground or aerial photographs which are combined to create a scaled and stitched building facade or map . Unlike a single photograph which contains distortion and perspective, relatively accurate measurements can be taken from an orthophoto map. As orthophotos also show everything visible from above and in colour, they are an excellent complement to digital terrain models and the linework shown in a typical topographical survey, roof survey or stockpile and volume survey.

What is a point cloud survey?

A point cloud is an output, deliverable or result from a survey which has deployed mass data collection methods such as laser scanning or photogrammetry. Up to millions of points are contained within the point cloud file, with or without colour. A point cloud viewer allows the file to be viewed in a digital 3d environment, where further modelling, measurement or inspection can be carried out. Point clouds underpin a number of reality capture solutions and offer a tool for surveyors to gather the data for 2d drawings efficiently and safely in some cases.

What is reflectorless measurement?

Modern total stations allow the surveyor to measure most surfaces without the need of a reflective prism. These are called reflectorless or remote measurements. Typically used on topographical surveys when the ground level isn't required, such as to measure building positions on private land, ridge and eave heights, over head cables and tree canopy levels. Land surveyors are less concerned with the ground level for every measurement when undertaking measured building surveys and boundary surveys. In the interests of accuracy and efficiency, reflectorless methods are used much more on these types of survey.

What are spot heights or spot levels?

These are general heights/levels/elevations taken at a single point, usually in a grid format over a survey area.

What is a Title Plan and how do I get it?

A title plan usually accompanies the title register at Land Registry. It is a drawing showing the land which is described in the title register, usually edged in red (indicating only a general boundary line). You can request your title plan from Land Registry for a small charge. If you are working with a solicitor or boundary surveyor, they may have already obtained relevant title information to carry out the works.

What is a survey traverse or traversing?

Traversing is a process used by land surveyors to establish control networks and to move their equipment about a site to enable further measuring to be carried out. Usually consisting of three tripods, two tripods are used as a baseline to measure a new position under the third tripod. This third tripod can then be used as part of a new baseline, while the furthest back tripod is picked up and carried forward to be the new position, and so on. Ideally traverses should be closed on themselves (a loop) or to known points, to allow errors to be identified and distributed appropriately.

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