Class Q Barn Conversion

Godinton House Preservation Trust


Conversion of concrete portal framed agricultural building to residential under Class Q Permitted Development.

  • Air leakage 1.0 ach
  • Triple glazed
  • Mechanical ventilation with heat recovery
  • Super insulated with cellulose fibre
  • Solar thermal for hot water
  • AECB Silver Standard Certified
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Extension and Refurbishment

Private Client


  • Detached remote cottage on Romney Marsh (known as the Fifth Continent due to its unique climate, specialising in horizontal rain).
  • Removal of plastic conservatory.
  • New timber framed extension with zinc flat roof, to maximise views across the marshes.
  • Rendered insulation on exposed walls.
  • New drainage system, the first on the marsh to obtain an Environment Agency permit under the Environment Permitting Regulations 2010.

    Client review
    ‘Thank you so much for helping us transform our home in the past year. It has had an overwhelmingly positive impact on our living environment and I can’t thank you enough for that’.

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Grade 11 Listed Flint Barn Conversion

Private Client


  • Grade II listed flint barn and byres
  • Conversion into dwelling and home office for farming family
  • Super insulation of roof and floor, and gable walls
  • Main walls remain in flint finish inside and out
  • New bedroom pods in barn suspended on slender steelwork, leaving most of walls visible from the open plan ground floor living areas
  • Triple glazed windows, ventilation system, and low energy heating system
  • First use of Aquion Energy aqueous ion batteries on an autonomous dwelling in the UK
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Complex Re-roofing of 16th Century Cottage

Private Client


  • Recovering of all roof slopes
  • Associated roof strengthening/repairs
  • Insulation works using wood fibre
  • New dormer window
  • Conservation type roof lights
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Whole House Silver Standard Refurbishment & New Loft Rooms

Private Client


  • Loft conversion to provide new first floor storey within roofspace
  • Roof thermally insulated and recovered using existing tiles
  • New rooflights provided to front and rear roof slopes to facilitate natural lighting and ventilation
  • All external walls externally insulated to improve thermal efficiency
  • Triple glazed, high performance timber windows and doors
  • Solar thermal panels to south facing roof slope
  • AECB Silver Standard certified

 

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Comprehensive Refurbishment and Extensions to AECB Silver Standard

Private Client


  • Refurbishment to AECB Silver Standard
  • 2 storey front and side extension to provide a new annexe
  • Rear single storey extension
  • Whole building externally insulated floors replaced and insulated
  • Materials used to match and be sympathetic to the existing building
  • Triple glazing throughout
  • Mechanical ventilation with heat recovery
  • Solar shading to southern elevation
  • Sedum flat roof
  • Solar thermal for heating hot water
  • Solar PV panels
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New Low Energy House, Totnes

Terra Perma Ltd


  • Technical design, building regulations and specification by Conker.
  • Designed to Passivhaus thermal & airtightness and thermal bridge standards, but with passive stack ventilation.
  • Built by Terra Perma Ltd, to an architectural design by Helen Lucas Architects.
  • Natural breathable insulation used for walls and roofs.
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Refurbishment and Extension of Victorian Terrace House

Private Client


  • Single storey extension within spatial limitations of Permitted Development Rights
  • Thermal upgrades to floor and loft
  • Replacement windows
  • Bathroom and kitchen upgrades
  • Internal repairs
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External Insulation, Repairs and Rendering

Private Client


  • Remediation of defects to masonry cavity walls
  • Repairs to DPC’s
  • External wall insulation system using wood fibre and lime plaster
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Replacement Low Energy Dwelling

Private Client


  • Pre-fabricated timber frame system supplemented with external wood fibre insulation
  • Design combines traditional elements with use of modern features sympathetic to its surroundings and within constraints associated within a flood risk zone
  • Glazing carefully orientated to maximise passive solar gain and natural daylighting, and take advantage of northerly views across the marshes
  • Small air sourced heat pump, with solar hot water system
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Replacement Dwelling

Private Client


  • New oak frame building designed in collaboration with Norton Timber.
  • High levels of insulation
  • Triple glazed windows
  • Airtightness 2.27 ach
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Major Alterations and Refurbishment

Private Client


  • Major alterations and refurbishment for private client
  • High levels of thermal insulation and airtightness
  • External wall insulation
  • I-joist roof construction
  • Garden design by Conker’s Russell Stevens
  • Sophisticated home audio and automation system by Philharmonic
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Community Hall Refurbishment

Westgate Community Trust Canterbury


  • Conker have been collaborating on this wonderful community project since 2010
  • The Hall was acquired by the community after it was threatened with demolition by Canterbury City Council.  Conker wrote a report on the building, assessing its potential for refurbishment
  • New roof covering on a new roof structure sitting over the existing steel roof trusses, incorporating 300mm of sheeps wool insulation
  • Natural ventilation system of rotating vents on the ridge of the roof replace the original vents.  These ‘wind-catchers’ by Vision Vent extract stale air whilst admitting fresh air
  • Internally the gable ends are insulated with 140mm sheeps wool
  • New lighting, heating, and kitchen bring the Hall into the 21st Century
  • Winner of the RICS South East Awards 2015, Community Benefit category

Now available for bookings, please contact info@westgatehall.org

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Gate House Repairs

Godinton House Preservation Trust


  • Repairs to listed Gate House.
  • Damp dry linings replaced with Lime Green and Steico internal insulation system designed to prevent condensation and mould growth.
  • Insulation applied to solid walls and skeilings, and sheeps wool insulation in the loft.
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Conversion of Bungalow

Private Client


  • 1960’s bungalow in flood risk area converted into 2 storey family home with accessible annexe.
  • Ground floor levels raised 400mm for increased flood resiliance.
  • Super insulated new timber framed first floor added with triple glazed windows.
  • Annexe built from solid wall construction with external wall insulation.  Existing cavity walls externally insulated.
  • Pioneered the Illbruck window installation system for solid walls with external insulation.
  • Air leakage reduced from over 10 to 2.03 ach.
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Whole House Refurbishment and Large Extension

Private Client


  • Building survey carried out prior to purchase
  • Full measured survey
  • Planning application for rear and side extensions, working in collaboration with Geoff Pearson architect
  • Building regulations application and tendering
  • Contract administration, working with Ansley Builders Ltd
  • Work included new triple glazed timber windows and sliding folding doors from Unilux, and thermal improvements to existing house

 

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Listed Building Refurbishment

Brockhill Park Performing Arts Academy


  • Grade II listed school administration block in Hythe dating back to the Jacobean period
  • Slate roofs recovered with Welsh slate
  • Chimneys rebuilt and repaired using ragstone, soft red brick, and lime mortar
  • Roofs cleaned of pigeon detritus and insulated with 300mm wool
  • Elevations decorated
  • Sash window repairs
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Reconstruction of Farm Classroom

Brockhill Park Performing Arts Academy


  • Agricultural barn converted into eco-classroom
  • New walls and new roof formed with 300mm I-joists to create continuous thermal envelope with no cold bridging
  • Veranda provided to give solar shading and alleviate problems with glare and overheating and to provide shelter for inclement weather
  • High levels of thermal insulation and air tightness ensuring very low heat losses in winter with resultant low energy requirements and running costs
  • Natural daylighting maximised wherever possible through use of rooflights and glazing positioning
  • Mechanical ventilation system with heat recovery to supply constant low level ventilation when building is in use, in compliance with BB 101
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Loft Conversion

Private Client


  • Loft conversion to create an extra bedroom
  • Designed to retain a completely open room without structural intrusions
  • Incorporates new dormer window to provide natural light and ventilation
  • Lead work by Barry Shotton
  • Main Contractor, Ecolibrium Solutions Ltd
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Silver Certified Eco Refurbishment and Extension

Private Client


  • Eco refurbishment and extension of 1960’s house in Grayshott, Surrey
  • Assessed using Passivhaus software and designed to AECB Carbonlite Silver Standard
  • Specific Space Heating demand as existing 278 kWh/m²a, reduced to 38 kWh/m²a
  • Air leakage improved from 9.5 air changes per hour to 2.5  air changes per hour
  • Improvements include external wall insulation using wood fibre, constant running mechanical extract ventilation, Katzbeck triple glazing
  • Project certified under the AECB Carbonlite Silver Standard
  • See the Low Energy Buildings database entry for details
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Caring Wood, Kent

Private Client


Architects – James Macdonald Wright & Niall Maxwell                              Photos by ©Ioana Marinescu

We have been using our Passivhaus experience to help detail this stunning new low energy country residence located outside Maidstone in Kent, which is to be built to Code Level 6, possibly the most ambitious dwelling ever built in the UK to such a standard. Being built to Code Level 6 means it is close to being carbon neutral, although this subject is hotly debated in eco building.

It is being built under PPS7 which is ‘an isolated new house in the countryside ….. clearly of the highest quality, is truly outstanding in terms of its architecture and landscape design, and would significantly enhance its immediate setting and wider surroundings ….. The design of such a house should be ground breaking in its use of materials, methods of construction or its contribution to protecting and enhancing the environment…..’

We are working as part of a team of architects and engineers from London and Wales.  The immense complexity of the design is extremely challenging when trying to eliminate thermal bridges, whilst using very traditional external materials such as ragstone, clay tiles, and handmade bricks.
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New Passivhaus, Dorset

Private Client


  • New detached house designed to Passivhaus standard
  • Designed with repeatability and efficiency in mind
  • Timber frame prefabricated off site
  • Triple glazed windows
  • Super insulated to minimise heat losses and maximise passive solar gain and natural day lighting
  • Solar thermal to provide hot water
  • Photovoltaic panels to generate electricity
  • Self-build, complete
  • Passivhaus certified
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Thermal Insulation Assessment at Knole House, Sevenoaks

Purcell Architects


Following on from our work with SPAB on insulating old buildings, we advised architects Purcell on the best method of upgrading walls and roofs at Knole House, as part of repair and improvement work being undertaken by The National Trust.

We undertook U value and interstitial condensation calculations, using weather data gathered on site over the last 2 years.

As with all historic buildings, preservation of the fabric is the main priority.  In some cases introducing insulation would increase the interstitial condensation risk, in which case it is better to avoid insulating. This shows the importance of careful analysis.

Selecting the appropriate materials and carrying out the work to a high standard are equally important.

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Refurbishment and Extension of Wartime Hut, Hawkinge

Private Client


  • Former World War 11 RAF Hut restoration and extension.
  • Property in an Area of Outstanding Natural Beauty (ANOB) and Special Landscape Area (SLA).
  • Original parts clad in corrugated steel sheeting reflecting the historical military association of the building and local area.
  • New extension clad in oak weatherboarding making a clear visual demarcation between the original and new build.
  • Selfbuild.
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New Access Staircase to Grade I Listed Building

Godinton House Preservation Trust


  • Highly sensitive design evolved with client, Ashford’s Conservation Officer and English Heritage
  • Provides private access to apartments to avoid use of 17th century main stairs
  • Complex internal alterations to WC and bathroom
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Traditional and Vernacular Eco House for 21st Century

Private Client


  • New family home in Conservation Area
  • Designed by client (Architect and Conservation Officer)
  • Uses traditional materials including brick, flint, clay tiles, and timber cladding
  • Conker provided energy performance calculations using Passivhaus Planning Package, and produced the detailed design, calculated to achieve a specific space heating demand of 15 kWh/m²a
  • House uses triple glazing, heat recovery ventilation, and a tiny gas boiler to heat ventilation air and towel warmers
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Replacement Dwelling

Private Client


  • Replacement dwelling in AONB (Area of Outstanding Natural Beauty), in an exposed location
  • Client’s brief was for a traditional appearance but exceptional thermal performance, at a sensible price. Therefore a simple and efficient plan and shape was adopted, with a porch to mirror the original
  • The new design meets Passivhaus criteria for heating load, based on super insulated walls, floor, roof, triple glazed windows, mechanical ventilation with heat recovery, solar shading
  • Designed so there is no need for central or underfloor heating due to tiny heating demand
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Straw Bale Eco House, High Halden

Private Client


  • Featured on Channels 4’s Build the Dream
  • Self build elliptical 2 storey straw bale house
  • Larsen trusses support main roof loads, including green roof
  • Straw bale infil for insulation
  • Internal tower of dense masonry provides thermal mass
  • Achieved an amazing air leakage result of 0.5m³/m²hr, proving that straw bales can be used in Passivhaus design
  • Reed bed sewage treatment and rainwater harvesting
  • Locally made double glazed oak framed windows
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1960’s Retrofit

Private Client


  • Semi detached house, typical of the era, with a mixture of cavity and solid walls
  • Eco refurbishment and energy efficiency improvements
  • Extended to the side, 2 storeys, and given a thorough range of thermal improvements
  • Front cavity wall widened to accept 225mm of insulation
  • Rear insulated with 200mm of wood fibre and lime rendered
  • Heat recovery ventilation, solar PV, solar thermal, triple glazed windows and built in bat and bird boxes
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Retrofit and Extension, Guildford

Private Client


  • 1930’s detached house, of cavity and solid wall construction.
  • Extended to provide additional bedroom, new kitchen, and spacious family room overlooking garden.
  • Existing house insulated and upgraded, typical U values 0.15 W/m²K.
  • Energy calculations carried out using Passivhaus software, the eco refurbishment was based on EnerPhit principles.
  • New triple glazed windows.
  • Contractor: Kithurst Builders

Note: photos courtesy of client

 

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High Performance Retrofit Scheme, Guston, Dover

Private Client


  • Eco refurbishment assessed using Passivhaus software and based on the EnerPhit principles.
  • External wall insulation using 200mm expanded cork, finished with lime plaster.
  • Roofs upgraded with 50mm polyurethane between rafters, plus 200mm sheeps wool under, with vapour control layer and plasterboard.
  • New passivhaus certified triple glazed aluminium/wood windows.
  • New comfort ventilation system (MVHR) from Itho.
  • Thermal bridges and air leakage were carefully addressed and rectified.  Air leakage was reduced in excess of 10 ach down to 2.8 ach.
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New Village Hall


Lloyds Hall, Outwood, Surrey.
  • New village hall designed by Conker to replace existing hall which suffers from severe structural problems
  • Located in the Green Belt and therefore comprehensive supporting documentation was produced to justify the Planning Application
  • Consultation with village residents led to a traditional design, which blends local materials and roof pitch with modern windows and thermal performance
  • Currently fund raising.
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Ecobarn

King Edward V1 Humanities College


  • Low energy sustainable classroom, designed in collaboration with C P Associates for King Edward V1 Humanities College in Lincs.
  • Constructed from Hemcrete by Lime Technology Ltd
  • Rammed earth mass wall internally, designed by Ram Cast CIC
  • Full mechanical ventilation with heat recovery.
  • Northlights for high quality daylight.
  • Recycled plastics by Smile used for desktops and splashbacks.

 

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New Passivhaus, Faversham

Private Client


  • New detached house with basement, timber framed with flat roof.
  • Designed to avoid overlooking and privacy to over 30 neighbours.
  • Recommended by Swale Borough Councillors who commented “we should be honoured that our borough has been chosen as one of the first to have this kind of building”.
  • Currently being certified.
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Passivhaus Artists Studio, Canterbury

Commercial Artist


  • The UK’s first certified light industrial Passivhaus.
  • Constructed using timber I beam portal frames without any tie members, giving a totally free interior volume.
  • Heated by a wood pellet boiler on a district heating circuit.
  • Airtightness 0.36 ach at 50 Pascals.
  • For further details please see the Internal Passivhaus Database
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Tyland Farmhouse Conversion, Maidstone

Kent Wildlife Trust


  • Total refurbishment of 17th century farmhouse from a derelict state into a comfortable office space for Kent Wildlife Trust staff.
  • External wood fibre insulation and lime render replaces 3 to 4 layers of cement render.
  • Rainwater harvesting serves WC’s and irrigation system.
  • Low solvent paints, natural fibre floor finishes, recycled plastic worktops, recycled car tyre entrance mats complete the project.
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New Classroom, Reception and Messroom

Canterbury Oast Trust


  • Built in an area of protected woodland
  • Minimal foundations to prevent damage to tree roots
  • Replaces dilapidated sheds
  • Constructed with timber felled on site
  • Craft and nature room constructed from straw bale infill using straw from adjoining farm
  • Methods of construction allowed non skilled labour of volunteers and rangers to contribute extensively to the work

 

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Rippledown Environmental Education Centre,
Ringwould, near Dover

The Bay Trust


  • One of our longest standing clients, a wonderful centre for school children to learn about their environment.
  • We have designed a straw bale classroom block which compliments the historic main building.
  • Main frame from reclaimed douglas fir, machined and erected by Norton Timber
  • 8 years on and funding is still not available to complete this project.  Next phase – windows, internal fit-out.
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Retrofit of Victorian House, Faversham

Private Client


  • Costly render repairs made external wall insulation a financially viable option, for this hard to heat end of terrace 3 storey house.
  • A combination of 200mm and 100mm external insulation was used, with internal insulation to the sensitive front elevation.
  • Combined with solar thermal and a new boiler, energy consumption has reduced by 60%.  The property features in the SEA’s Superhome database.
  • Even in a historic conservation area such as Faversham, thermal improvements are possible, if carefully thought out.
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Grade ll Listed House, Rye

Private Client


  • Grade 11 listed house in Rye’s central conservation area.
  • Rear extension to form kitchen, dining, bathroom and ensuite.
  • Repairs to existing solid and timber framed construction, using appropriate materials.
  • Thermal insulation using appropriate materials, rainwater harvesting, solar thermal, central ventilation unit.
  • Conker Conservation carried out the survey, design, planning application, building regulations, specification and tender.  Client project managed work on site.

 

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Roof Refurbishment, Margate

Private Client


  • A delightful cottage which existed long before Margate’s expansion, with flint walls and peg tile roof.
  • We arranged major roof repairs, and roof insulation works, using SPAB’s latest guide on Kent Peg Tiles.  Most of the tiles were reusuable, apart from the newest ‘Rosemarys’ which were defective.
  • Works were carried out on budget by S & T Fullers Builders Ltd, with the owner in-situ.
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New Low Energy House, Alkham Valley, near Folkestone

Private Client


  • An affordable, simple and functional new house for a farmer who has lived in a caravan for 17 years.
  • Timber frame, double-glazing, cork cladding, under a ‘brown’ roof.
  • Energy efficient buildings need not be complicated or expensive.

 

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Former Poison Shed Conversion, Bekesbourne, Canterbury

Private Client


  • Former poison shed converted into an energy efficient annexe
  • Internal wall insulation, warm roof construction and fully insulated floor
  • Underfloor heating via condensing gas boiler. Solar thermal hot water. MVHR. Rainwater harvesting
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Self-build to Passivhaus Standard, Chilham, Kent

Private Client


  • Self-build to Passivhaus standard, detailed design in 2007, still under construction!
  • Traditional design in area of outstanding natural beauty
  • Detailing designed to be suitable for self-builder
  • MVHR and solar thermal
  • Will be ready for Christmas, but which year is uncertain
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Passivhaus, Shepherdswell, Dover, Kent

Private Client


  • Designed to avoid overlooking and privacy issues with neighbours
  • Built using both cavity wall construction and timber frame
  • Air tested prior to completion at 1.0m³/m²hr
  • Passivhaus standard U values, avoidance of thermal bridges, MVHR, rainwater harvesting and solar ready
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Refurbishment, Extension and Alterations, Whitstable

Private Client


  • Dilapidated house in conservation area with Article 4 Direction.
  • Building underpinned, stitched and tied together.
  • New 2 storey side extension, single storey rear extension.
  • Glazed link between new and old.
  • Thermal upgrade using natural materials.
  • Much of the work carried out by the client.

 

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Recovering of Flat Roof and Formation of Terrace Office,
Central London

Friends of the Earth


  • Survey and feasibility to determine sustainable and economic roof recovering
  • Design and specification of system incorporating natural cork insulation and recyclable PVC-free single ply roof membrane
  • Oak decking
  • Sweet chestnut decking
  • Costings and advice on ecological refurbishment of office
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New Classroom Block for Netherfield Centre for Sustainable Food and Farming, East Sussex

Plumpton College


  • Rammed earth walls utilising clay sourced from the site with locally sourced aggregate
  • Green roof system
  • Passive solar design
  • All materials selected to be sustainable and to provide a harmonious internal environment
  • Undertook all design and specification
  • Contract administrator
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New House, Charing, Kent

Private Client


  • Replaces dilapidated bungalow in Area of Outstanding Natural Beauty
  • Considerable planning research/liaison required due to very sensitive area
  • Design developed to minimise visual impact and heat loss – very exposed site
  • Super insulated walls, floor and roof, partially earth sheltered with planted roof
  • Maximises solar gain with dense internal walls for thermal mass
  • Design has received Ashfords ‘Building Design and Construction Award 2009, Residential Development category’
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Front Extension/Alterations, Kent

Private Client


  • Unusual front extension recommended due to restrictions at rear
  • Steeply sloping site enabled a lower ground floor to be added
  • Property within a Conservation Area, much research/liaison required
  • Achieved much improved access from street level
  • Design and specification of materials critical due to client’s chemical intolerance
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The Pines Calyx™, New Community and Conference Centre,
St Margaret’s Bay, Kent

The Bay Trust


  • Earth bermed circular construction using rammed chalk walls with vaulted tiled domed roof and vaulted internal staircase
  • Researched use of chalk as wall material, and specialist products such as ‘zero-energy’ cork and timber triple glazed windows
  • Incorporates holistic approach to design, materials and construction
  • Undertook all detailed design, obtained planning and building regulation consents and acted as project manager
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Barn Conversion, Rose Cottage Barn, Romney, Kent

Private Client


  • Remains of a barn in in dilapidated condition
  • Amended existing planning consent and obtained approval of planning conditions
  • Obtained building regulation consent for conversion
  • Obtained planning permission for conversion
  • Extensive timber repairs required – sensitive to historical fabric
  • Design incorporated use of traditional materials and construction methods
  • Further extensions added in 2014.
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Refurbishment of Historical Dwelling in Faversham

Private Client


  • Grade II listed dwelling requiring refurbishment
  • Extensive liaison required with Conservation Officer
  • Designed and specified use of traditional construction materials eg; wattle/daub, lime rendering
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New Urban House, South East London

Private Client


  • Replaces disused garages in heavily built up area
  • Planners had previously refused permission for conventional house submitted by the developer
  • Evolved contemporary design following liaison with local residents and local authority
  • Design has since received a ‘Green Apple’ Award, ‘National Silver Winner, Small Residential Project’
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