A foundation

of trust

There is no such thing as a ‘free’ survey.

CSRT, CSSW and MCIOB accredited


We make sure you're protected. Inside and out.

At Crownstone, we work with residential and commercial clients to survey, plan and design all aspects of basements. Our fully-qualified team of surveyors, designers and structural water-proofers will perform a site visit and assess each facet of your basement’s requirements, producing advice which is correct, customised and complies to the current British Standard Code of Practice for the Protection of Below Ground Structures Against Water (BS8102: 2009).

Call us and book a survey now on 0208 226 5654

Defect Analysis

Buildings are valuable investments and, when something goes wrong, it’s only right to be concerned. Dealing with above-ground structures is one thing, but dealing with basements, and the complex interplay of structural and environmental concerns at stake, takes a specialist.

At Crownstone, all our basement defect analysts hold the Certified Surveyor in Structural waterproofing (CSSW) qualification. With over 20 years’ experience in inspecting basements of varying ages, construction methods and purposes, our defect analysts will utilise their expert knowledge gathered from diverse scenarios to evaluate and resolve your issue with accuracy and efficiency, providing you with a fully-insured, BS8102-compliant design, guaranteed to keep your basement protected and dry.

To book a Basement Defect Analysis survey call us today on 0208 226 5654 or complete the online contact form at the bottom of the page.


Structural Waterproofing

Ground water flooding is becoming an increasing problem throughout many parts of London for both existing and new properties. Heavy rainfall, rising groundwater levels and deep excavations for new developments have changed the course of water in the ground, causing many previously dry basements to flood unexpectedly.

When it comes to basement waterproofing you cannot cut corners. We have seen many examples of failures due to inadequate design, poor installation or incorrect use of products. Often these failures lead to a lot of disruption and high costs for reinstatement and damage. 

Designing the right system requires careful consideration of all the factors, including the type of structure, history of groundwater issues, its use and location. Whether you have a new development or an existing property, we will work with you to ensure the right solution. 

At Crownstone, all our surveyors are CSSW qualified and fully understand the requirements of BS8102 (The code of practice for the protection of below ground structures from water from the ground). All works are designed in accordance with this standard.

To arrange a Structural Waterproofing Design Visit, please contact us today on 0208 226 5654, or complete the online form at the bottom of this page.


Construction Sequence

From a structural point of view, you might think that all basements are created equal. But the reality is that every basement has its own nuances, strengths, and weaknesses.

Whether you own a home with an existing basement, are in the market for a home that has one or are hoping to build a new home that includes a basement, it’s essential to understand the relationship between the basement and other foundation issues.

Building a basement is specialised and high-risk work. Your project architect and engineer must provide detailed plans of the finished basement. Your builder must use these plans, together with a comprehensive knowledge of the ground conditions on site, to ensure that construction work is planned and undertaken safely and efficiently.

That’s where we come in. At Crownstone, we have access to a highly skilled team of construction sequence engineers, who are able to translate a paper-based ideal into a physical reality.

Our basement construction sequences are holistic in their approach, drawing on the analysis of expert reports from tree surveyors, geologists, structural engineers, temporary works engineers and numerous other specialist fields to ensure that your basement construction runs without a hitch.

At Crownstone, not only will we provide you with a detailed and logistically accurate construction phase plan for your basement, but we can work alongside your chosen contractor at each step of the journey, providing stringent quality control and peace of mind.

Call us today on 0208 226 5654 to discuss your Basement Construction Sequence requirements with one of our friendly team of advisors or, alternatively, complete the online form at the bottom of this page and we will get back to you.

Pumping Stations and Drainage

One of the main design considerations when designing a basement is to consider managing the collection and discharge of ground, surface and/or foul water. Most projects will require a collection sump and pump to automatically manage the evacuation of water ingress.

A sump and pump solution will require mains power to operate. The number of pump systems required for each project will in part depend on the overall basement size, perimeter, discharge invert, and the method of drainage. At Crownstone, our expert drainage and waterproofing surveyors can work alongside your team at design stage, to ensure that all of these points, and more, are covered. 

To learn more about our pumping station and drainage designs, call 0208 226 5654 today, or complete the online form at the bottom of the page.

Contact Us