Survey Package for House Extensions: MBS, Topo, Drainage and Planning Inputs
A survey package for house extensions combines measured building, topographical, and drainage surveys into one commission. One site visit covers everything your architect needs to design your extension. icelabz delivers survey packages for house extensions across London.
Why House Extensions Need Multiple Surveys
A house extension project needs data from multiple surveys. A measured building survey captures the existing house. A topographical survey captures the garden and site levels. A drainage survey maps the underground pipes. Commissioning together saves time and money.
Measured Building Survey (MBS)
The existing house dimensions for your architect to design against.
Floor plans — Every floor level at 1:50 scale.
Elevations — All four sides of the house.
Sections — Cross-sections showing ceiling heights and floor levels.
Roof geometry — Roof shape, pitches, and overhangs.
Topographical Survey
The site context for setting out your extension and designing the garden.
Levels — Spot heights and contours across the garden.
Boundaries — Accurate boundary positions.
Features — Trees, paths, driveways, and other garden features.
Adjacent levels — Levels from neighbouring properties where relevant.
Drainage Survey
The underground drains that your architect must design around.
Drain routes — Accurate positions of all underground pipes.
Manhole locations — Positions and cover levels of all drainage.
Drain depths — Invert levels of drains for connection design.
CCTV report — Condition survey of existing drains if required.
What You Get From the Survey Package
Existing drawings — Floor plans and elevations of your house.
Site plan — Topographical plan with levels and features.
Drainage plan — Underground drainage layout.
CAD files — DWG files for your architect.
Coordinate reference — All data in the same coordinate system.
Why Commission Together?
One site visit — All surveys from one deployment.
Coordinated data — Building, site, and drainage all in the same coordinate system.
Lower cost — Combined package cheaper than three separate surveys.
Faster — All deliverables arrive together.
Consistent — No inconsistencies between separate survey datasets.
Common House Extension Survey Mistakes
Only commissioning floor plans — You need site levels too, especially for basement extensions.
Missing drainage data — Your architect needs drain positions to design foundations.
Inconsistent data — Separate surveys may use different coordinate systems and levels.
No boundary data — You need accurate boundaries for planning applications.
Survey Package for Different Extension Types
Single-Storey Rear Extension
- Measured building survey (existing house)
- Topographical survey (garden levels)
- Drainage survey (underground pipes)
Two-Storey Extension
- Measured building survey (existing house)
- Topographical survey (garden and neighbour levels)
- Drainage survey (all drains)
Basement Extension
- Measured building survey (existing house)
- Topographical survey (site and neighbour levels)
- Drainage survey
- CCTV drain survey (condition assessment)
- Level survey for basement depth design
London Coverage
icelabz provides survey packages for house extensions across all London boroughs.