Welcome to David Cosby Chartered Surveyors and Estate Agents. We have over two decades of professional property experience serving Northamptonshire, Warwickshire, and Buckinghamshire.
An RICS regulated firm providing a personalised service with attention to detail and the highest levels of integrity.

Book A Free Market Appraisal
Property Specialists
Alongside our residential sales and lettings work, we offer a full suite of professional services, including RICS surveys and valuations, architectural design, measured building and land surveying, boundary and title-plan work, and advice on planning and building control matters. Our approach brings together surveying, legal and technical expertise to support clients at every stage of their property journey.
Property Specialists
We operate a Professional Estate Agency providing a bespoke sales service with the benefit of the Directors having Surveying and Property Law backgrounds to offer unrivalled assistance in helping parties to reach exchange and completion.
Our Independent Chartered Surveyors and Architectural Technicians are able to provide a complete range of surveying and design services.
A Professional Estate Agency Service
David Cosby Chartered Surveyors & Estate Agents are an RICS registered firm and have the benefit of Surveying and Legal expertise to help with your sale and purchase. Estate Agents who are regulated by the RICS uphold the core principles of transparency and provide the highest level of professional standards and ethics.
We are so confident in the professional service we provide that we have no fixed term contract or tie in periods, and our current rate is just 1% Including VAT on a No Sale - No Fee basis.
As an independent family run business with your best interests at heart we are able to provide a comprehensive personal service that cannot be matched by the larger corporate firms.
If you are considering selling or would like further information then please contact us on to arrange a free, no obligation market appraisal.
Gareth Powell MARLA
Sales & Lettings Manager
David Cosby MRICS
Principal Director | Building Surveyor
Natasha Cosby MNAEA | Solicitor
Director | Practice Manager
Virginia Church MRICS
Building Surveyor
Sadie Tyson MNAEA
Sales & Lettings Agent
A Professional Lettings Service
Managing a rental property can be demanding, particularly when balancing tenant selection, maintenance, compliance, and day-to-day communication. Our lettings team provides a professional and structured service to support landlords and protect their investment.
We are regulated by both the Royal Institution of Chartered Surveyors and ARLA, giving landlords confidence that their property is managed in line with recognised professional standards.
We have detailed knowledge of the local rental market and can advise on appropriate pricing, marketing, and tenant selection. Our referencing and screening process is designed to help secure suitable tenants who will meet their obligations throughout the tenancy.
Our service covers tenancy documentation, renewals, routine inspections, and maintenance coordination. We work with trusted contractors to address repairs promptly and keep the property in good order, while maintaining clear communication with both landlords and tenants.
If you are seeking a reliable, well-managed lettings service with clear professional oversight, please contact us to discuss how we can help.
Latest News and Projects
A Little History of Towcester
Moving to Towcester? This market town, known as Lactodorum, was a bustling hub on the famous Watling Street. Today, its rich heritage is reflected in landmarks like Bury Mount, the Towcester Museum, and the nearby Stowe Gardens, shaped by Capability Brown. With its blend of history, green spaces, and proximity to modern attractions like Silverstone Circuit, Towcester offers a unique connection to the past while embracing the present.
Spray Foam Insulation | A Growing Problem for UK Homeowners
Spray foam insulation has become a popular choice for improving energy efficiency in UK homes, but its widespread use has also revealed significant challenges. From trapped moisture to mortgage refusals and insurance complications, homeowners are finding that spray foam is not always the straightforward solution it appears to be. This article explores the risks, examines government schemes like the Green Homes Grant, and offers practical advice for navigating these issues, particularly for owners of period properties
Do I Need a RICS Red Book Valuation for Probate?
Understanding whether a probate estate requires a RICS Red Book valuation or an estate agent’s appraisal is essential. This guide explains the differences, when a formal valuation is advisable, and how each affects inheritance tax reporting.



























































