This is where comparing CRM implementation quotes based on price alone becomes difficult. Two suppliers may both describe their service as a "Zoho CRM implementation", while the amount of work included in each proposal can be substantially different.
At the lower end, a £1,000 implementation might cover the configuration of a sales pipeline, some custom fields, an import of existing customer data and a training session. For a business with straightforward requirements, that may be everything it needs and could represent perfectly good value.
A £20,000 implementation is likely to represent a very different project. It might include detailed process discovery, CRM architecture, multiple modules and pipelines, complex data migration, integrations with other systems, custom functions, extensive automation, management reporting, testing, training and support during the transition to the new system.
The difference in price therefore isn't necessarily an indication that one supplier is expensive and another is cheap. In many cases, the underlying scopes simply aren't comparable. When reviewing proposals, it is more useful to understand what has been included, what has been excluded and how closely the proposed solution reflects what the business actually needs.
An inexpensive implementation can become costly if important requirements are discovered later and have to be added retrospectively. Equally, there is little benefit in paying for a sophisticated implementation if the business only needs a well-configured sales pipeline and a clean customer database. A good proposal should make it clear why each element of the project is required and how it contributes to the finished CRM.