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Client Type: Private sector

Portal Way, London

12-storey mixed use building comprising of commercial kitchens and public spaces

The development consists of the demolition of the existing buildings to construct a 12-storey mixed use building comprising of commercial kitchens and public spaces at lower ground/ground floor levels to contain commercial and retail units alongside a food hall.

Scope of Work

Herrington Consulting were requested to undertake a Daylight and Sunlight Assessment Report for the impact on neighbouring properties alongside the impact on recently consented schemes. We also undertook an initial transient overshadowing assessment and façade analysis.

Constraints/difficulties overcome as part of the project 

The initial results indicated that majority of the neighbouring properties were compliant with the BRE criteria, but there were some properties experiencing reductions beyond the BRE thresholds. Consequently, we assessed the scheme against alternative targets using a previously approved scheme from 2021 on the development site as a baseline.

Concerns were also raised regarding the impact to a neighbouring scheme that had recently obtained outline planning and therefore did not have confirmed window and room layouts. We therefore suggested undertaking a façade analysis.

  

Photo courtesy of Dowen Farmer Architects

Peckham Church, London

A flagship contemporary church building on a prominent site along Peckham Road, London. 

Scope of Work

Herrington Consulting were tasked with producing a Flood Risk Assessment and Surface Water Management Strategy for the site. Whilst the risk of flooding was deemed low from all sources, the drainage design proved more complex, with the proposed church and associated parking covering nearly the entire site and an existing sewer crossing the site.  

Constraints/difficulties overcome as part of the project

Due to the invert level of the proposed sewer connection and the presence of an existing public sewer crossing the development site, it was necessary to keep all of the drainage above or as close to ground level as possible. Consequently, we utilised the flat lower level roof areas as green roofs and then provided permeable paving within the parking areas. We also worked with the LLFA to specify tree crates in the planted areas of the site to provide further SuDS and sustainability benefits.  

The solution provided would result in a 99% reduction in discharge rates for the design event when compared to the existing site.  

Images courtesy of Turner Jackson Day Associates

Overlap with other consultants

Architects – locations of SuDS, inclusion of green roof

 We collaborated with the architects Turner Jackson & Day Associates to ensure that the proposed SuDS did not impact on the movement of people across the site and its intended use, whilst providing SuDS which offered wider sustainability benefits and green spaces.

  

The Leas Pavilion, Folkestone

This is an example of where Herrington Consulting’s specialist Daylight & Sunlight team worked closely with the architect Hollaway Studio to ensure that the proposed scheme did not adversely impact upon the amenity of its neighbours. The scheme involved the complete restoration and redevelopment of the Grade II listed Leas Pavilion, in Folkestone to provide 90 apartments and a residents and community space for special events.

In order to maximise the potential for development at the Leas Pavilion site, whilst ensuring the proposal did not adversely harm the daylight and sunlight available to the neighbouring residential buildings, it was important to carry out an initial scoping phase to give Hollaway Studio an indication of the potential receptors that could be impacted. From this stage, cut back analysis was carried out in order to aid Hollaway Studio with potential massing options to help mitigate any loss of daylight and sunlight to surrounding windows. A detailed assessment was then produced for the finalised scheme to accompany the planning application.

Rendered image of 3D numerical model used in the simulation of daylight and sunlight impacts

Rufus Business Centre, London

This is an example of where Herrington Consulting’s specialist Daylight & Sunlight team worked closely with the architect Hollaway Studio to ensure that the proposed scheme did not adversely impact upon the amenity of its neighbours. The scheme involved the complete restoration and redevelopment of the Grade II listed Leas Pavilion, in Folkestone to provide 90 apartments and a residents and community space for special events.

In order to maximise the potential for development at the Leas Pavilion site, whilst ensuring the proposal did not adversely harm the daylight and sunlight available to the neighbouring residential buildings, it was important to carry out an initial scoping phase to give Hollaway Studio an indication of the potential receptors that could be impacted. From this stage, cut back analysis was carried out in order to aid Hollaway Studio with potential massing options to help mitigate any loss of daylight and sunlight to surrounding windows. A detailed assessment was then produced for the finalised scheme to accompany the planning application.

Daylight & Sunlight

Our initial involvement in the project was in the very early stages of the design where we worked alongside the architect to develop massing envelopes that were specifically ‘tuned’ to ensure the proposals would not adversely impact upon the daylight and sunlight enjoyed by the neighbouring properties. This was further developed as the design progressed and a detailed assessment was prepared to accompany the planning application.

Transient Overshadowing Study

This assessment also included a transient overshadowing study that allowed the shadows cast by the development to be tracked on an hour-by-hour basis for a range of times throughout the year. This provided a clear indication of any potential overshadowing impacts.

In addition to the impact on neighbours, we also worked with the architects to ensure that all habitable rooms within the development

would benefit from good levels of natural daylight and sunlight.

Solar Glare

The development is adjacent to the railway line and therefore the potential for reflected sunlight from the façades of the buildings to cause reduced visibility or distractions to train drivers was identified at an early stage. To ensure that the proposals would not impact on the safety of the railway a solar glare study was undertaken. This utilised numerical modelling techniques to simulate potential glare instances at a range of assessment locations along the railway line at different times of day. This was repeated throughout the year to identify all potential glare instances, and for each time/location that a potential glare risk was identified, the veiling luminance was calculated. This was then used to assess disability glare from the source.

Flood Risk

The site lies within Flood Zones 2 and 3 of the River Wandle and whilst it was possible to design the scheme such that all living accommodation was raised above the design flood level, the scheme did have potential to displace floodwater, thus increasing the risk of flooding elsewhere. Our role in the design was therefore to ensure that the volume of floodwater displaced was not increased by the scheme.

Using hydraulic modelling, different options were tested and refined. The final design included a floodable void space beneath part of the building, as well as voids beneath a raised landscaped public realm area in the middle of the site.

Medmerry Park

This is an example of where Herrington Consulting’s specialist Daylight & Sunlight team worked closely with the architect Hollaway Studio to ensure that the proposed scheme did not adversely impact upon the amenity of its neighbours. The scheme involved the complete restoration and redevelopment of the Grade II listed Leas Pavilion, in Folkestone to provide 90 apartments and a residents and community space for special events.

In order to maximise the potential for development at the Leas Pavilion site, whilst ensuring the proposal did not adversely harm the daylight and sunlight available to the neighbouring residential buildings, it was important to carry out an initial scoping phase to give Hollaway Studio an indication of the potential receptors that could be impacted. From this stage, cut back analysis was carried out in order to aid Hollaway Studio with potential massing options to help mitigate any loss of daylight and sunlight to surrounding windows. A detailed assessment was then produced for the finalised scheme to accompany the planning application.

Considerations

From a flood risk perspective, this was an incredibly challenging site with the risk of flooding from the coast being compounded by the risk of fluvial flooding from watercourses that run directly through the site and discharge to the sea. This project drew on the specialist skills of our flood risk consultants, coastal and drainage engineers as well as our in-house numerical modelling resources to identify all of the potential mechanisms of flooding, mitigation measures to reduce risk and a detailed strategy for protecting the site from flooding for the next 100 years.

Numerical Modelling

Nearshore wave climate analysis within the harbour undertaken using Boussinesq modelling, suite of wave overtopping models used, 2D hydrodynamic TUFLOW model used to determine flow paths and new flood gate design.

Coastal Morphology

The shoreline between Selsey Bill and the entrance to Chichester Harbour has been subject to storms and roll-back for centuries and Medmerry in particular has an extensive history of flooding, erosion and breach. The management of coastal flooding along this frontage is therefore intrinsically linked to the future evolution of the shoreline. One of the key elements of this project was therefore to gain an understanding of how the shoreline and in particular the shingle barrier beach will evolve over the next 100 years. The response of the beach to extreme storm events was simulated using numerical models, and in combination with the longer-term predictions of the shoreline evolution, this information was used to understand how the protection provided by the natural beach will change over time.


The outcome

From the outset, our project team engaged with the Environment Agency to ensure that our methodologies and strategic planning for the management of risk at this site were supported. As a result of ongoing consultation, and following the technical validation of our wave and hydraulic modelling, the Environment Agency confirmed that it had no objections to the proposals for the redevelopment of the holiday park.

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