Barnet Side Farm, Petersfield

Paul Basham Associates were enrolled in this project due to a referral from Radley House; Barnet Side Farm was a project that wanted to introduce two 5-bedroom houses and a stable block onto the site. Radley House were the appointed architects on this project and, due to the civil engineering related planning conditions and their previous involvement on other projects with us, they saw it appropriate to refer us to the client.

The Brief

Following our appointment onto this project, we were tasked with the discharge of various planning conditions, which included completing detailed drainage design, an S278 design package for the access, site levels and finished floor levels. We also completed the foundation design and super structure for construction.

Our Approach

Discharging The Drainage Conditions: To discharge these conditions we had to provide detailed drainage design for the site. Our proposed drainage strategy involved draining everything on-site, due to the lack of any proximate  sewer provisions. Our design included; the surface water being infiltrated via Soakaways and a gravity sewer system, and the foul water also being infiltrated, but via a drainage field; after passing through an appropriate wastewater treatment plant and pump, both specified by us. Our original foul water drainage design involved the use of septic tanks, but after reviewing this with the client it became apparent that a drainage field would be more appropriate, as the septic tanks required a level of maintenance that would’ve been too demanding and for commercial reasons also. Continuing, the completion involved completing the appropriate calculations and modelling, ensuring all our designs were in accordance with Building Regulations Document H and British Standard BS6297 and obtaining an environmental  permit from the Environmental Agency that allowed the client to discharge into the ground.

The S278 Design Package: As the use for the site was significantly changing, the existing access required improvement. This involved alterations to the existing highway, therefore, a Section 278 application was required. The design was for an extended bellmouth conjoined with a layby that would be used for loading/unloading, as this was requested by the client. For the application to be successful we had to provide engineering layouts, detailed design and specification of standard details. We were also required to engage in frequent discussion with Hampshire County Council regarding the suitability of the layby and how it would be acceptable to implement, as this type of bellmouth was not conventional. 

Site levels, Superstructure and Foundation Design: To complete these designs many factors had to be considered, such as ground geology, nearby trees, existing ground levels, the proposed house designs, expected land use etc. For example one of the biggest factors we had to consider was the high volume change potential of the soil, this was more significant  due to the nearby leylandii hedge.; foundation depths were adjusted accordingly to deal with this factor.  The appropriate calculations were completed, the appropriate materials were specified and suitable site level, superstructure and foundation designs were proposed.

The Result

Following the completion of our design works the conditions were discharged, we received the building regulations sign-off, the S278 application was submitted and technical approval was received after we addressed comments made by Hampshire County Council; the site levels, superstructure and foundation designs were deemed suitable. The project is now currently nearing completion of the construction phase. Paul Basham Associates are still involved in the project, providing site support where necessary and answering any ad-hoc questions from Barnet Evolution Limited and the groundworker.