When Should You Order a Combined Survey? A Decision Guide
A combined measured building and topographical survey is right when your project needs data about both an existing building and its site.
Decision Framework
| Does your project... | Then you need... | | --- | --- | | Involve an existing building? | Measured building survey | | Require a topographical survey? | Topographical survey | | Need both building and land data? | Combined survey | | Only need planning site plan? | Topographical survey only | | Only need building dimensions? | Measured building survey only |
When to Choose Each Survey Type
Order a Measured Building Survey Only
- Loft conversion or internal renovation (no land impact)
- Building regulations application
- Estate agent floor plans
- Property measurement for sale
Order a Topographical Survey Only
- Greenfield development
- Agricultural land assessment
- Highway or infrastructure project
- Drainage design without building works
Order a Combined Survey
- New build on brownfield site (demolish + rebuild)
- Extension with significant garden footprint
- Basement excavation with drainage requirements
- Change of use with external works
- Multi-unit residential development
- Commercial development on occupied site
- Planning application requiring site plan and building data
Project Type Decision Tree
Does your project involve an existing building?
├── YES: Do you also need site levels/boundaries?
│ ├── YES: Order a combined survey
│ └── NO: Order a measured building survey only
└── NO: Do you need building dimensions?
├── YES: Order a measured building survey only
└── NO: Order a topographical survey only
Key Questions to Ask
| Question | If YES | If NO | | --- | --- | --- | | Is there an existing building on site? | Measured building survey | Topographical survey | | Do you need OS grid coordinates? | Topographical element | Measured building only | | Does the LPA require a site plan? | Topographical element | Measured building only | | Are there trees or services to locate? | Topographical element | Measured building only | | Do you need floor plans for design? | Measured building element | Topographical only |
2025 Combined Survey Costs (ex VAT)
| Project Type | Combined Cost | vs. Separate | | --- | --- | --- | | House + garden (new build) | £900–£1,500 | Save 15–25% | | Commercial with car park | £1,800–£3,000 | Save 10–20% | | Complex mixed use | £3,000–£5,000+ | Save 10–15% |
Not Sure?
ContactIcelabz to discuss your project. Free scoping advice available.