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An Engineer's Ascertainment is used for works that do not require a Building Permit or Small Scale Building Permit, in accordance with the amendment of article 30 of Law 4495/17 with Law 4759/20 (Government Gazette 245/A/9.12.2020).
More specifically, no building permit or small scale building permit is required for the following works, subject to the special provisions concerning the area or the building:
a) interior painting works, small repairs of doors and windows or individual repairs for reasons of use and hygiene, repair or replacement of floors,
b) small-scale internal repairs or alterations that do not change the load-bearing construction of the building, as well as constructions required for the movement or any form of service for people with disabilities or people with disabilities. The construction of an elevator of par. 2 of article 27 of Law 4067/2012 (A΄ 79) is not included,
c) exterior painting or replacement of railings or repair of coatings or repair of facades without the use of scaffolding,
d) maintenance, repair, modification or even partial replacement of building installations and ducts,
e) replacement of internal or external frames and glass panes in the same opening,
f) maintenance and repair of roofs or roofs without the use of scaffolding,
g) small ground formations up to plus/minus 0.80 m from the natural ground,
h) installation of air conditioners and wall-mounted gas boilers for heating and production of domestic hot water in existing buildings, in accordance with par. 10 of article 16 of Law 4067/2012, installation of an array of wall-mounted gas boilers for heating or production of domestic hot water in ground-floor outdoor residential areas, installation of natural gas supply, regulation and measurement systems, such as regulators, meters and pipelines, installation of High Efficiency Cogeneration of Electricity and Heat (CHP) systems, above-ground natural gas distribution or measurement and regulation stations gas, according to article 17 of Law 4067/2012,
i) installation of solar water heaters, in accordance with par. 2b and 2c of article 19 of Law 4067/2012,
j) installation works of passive solar systems or replacement of external frames or installation or replacement of chimneys on the external faces of existing buildings, without the use of scaffolding, within the framework of the "Home Savings" program, as well as works of installation of passive solar systems or replacement of external frames or installation or replacement chimneys on the external faces of existing buildings without the use of scaffolding,
k) fitting or installation of equipment in buildings, such as cupboards and pots, changing, fitting or removing external partitioning elements, as well as fitting small areas of permanent decorative and utilitarian elements, such as statues, fountains, iconostasis, benches and tables, or temporary animal shelters surface up to three (3) sq.m. in uncovered areas of plots and fields,
l) construction of stoves, ovens and fireplaces with their chimneys in uncovered areas of plots or fields, provided that there is a building with residential use, as well as in a building that has a building permit or exists legally, as long as the load-bearing elements of the building are not affected by residential use, and provided that they are independent, individual residences with an independent supporting body,
m) construction of a pergola with or without a temporary surface shade up to fifty (50) square meters, in uncovered areas, front yards and ground floor terraces, as long as it is not prohibited by special regulations in force in the area,
n) constructions, such as stairs, inclined levels (ramps), supports and terraces in uncovered areas of plots and fields,
o) installation of temporary shades, blinds, sheds and awnings,
p) laying the floor of an uncovered space, provided that this does not exceed 1/3 of the uncovered space,
q) ground formation up to 0.80 m from the natural ground for reasons of improving its natural relief, using natural loose materials, such as soil and masonry without mortar, without altering its general natural geomorphology, the natural slope of rainwater runoff and the starting stations for measuring altitudes,
r) constructions within the plot-field to create entrance areas to the plots and fields, height up to two and a half (2.50) m, width up to two and a half (2.50) m, depth up to one (1.00) m,
s) constructions for the placement of electricity meters at the boundaries of the plots of land or within these uncovered areas, in accordance with the applicable specifications,
t) photovoltaic systems on buildings and for system power up to 100kW,
u) construction of underground bases made of reinforced concrete for the installation of electromechanical equipment of all kinds, the installation on them of the corresponding electromechanical equipment, as well as the construction of accompanying projects within each type and category of outdoor Substations of the Transmission System and the Electricity Distribution Network, existing or new ones, which at no point exceed 0.50 m from the final ground level and for which a static study approved by the implementing body is available,
v) constructions for the installation of infrastructure and installation of electric vehicle charging devices, without requiring the installation of a new MV/HV transformer (M/S) in the internal electrical installation.
w) Fencing using any material up to a height of three and a half (3.5) meters, fields in non-planned areas and in settlements that lack a city plan, within which the operation of immigrant detention centers, closed controlled island structures, reception and identification centers and hosting structures.
x) works required for the installation and operation of Waste Transfer Stations (WTP) of no. 114218/31.10.1997 joint ministerial decision (B1016), such as protective fencing of the area, configurations for traffic and vehicle access services including any required retaining walls, curtains for wind protection, installation of prefabricated houses (post/staff building), as well as the necessary infrastructure networks for the operation of the station and to deal with environmental impacts.

Before the execution of the above works, an electronic certificate from a competent engineer, issued by the information system of the Technical Chamber of Greece (T.E.E.), must be drawn up, that in the area of the property for the above works no approval is required from any body.
In case approvals are required from other agencies or collective bodies (Architecture Council, Ephorate of Antiquities, Forestry, etc.) a file is updated with the above approvals. The engineer undertakes the processing of the process of obtaining said approvals as well as any studies required to be drawn up.
In any case, an inventory of the building project is required at EFKA and the payment of the necessary formalities. In addition, in case of construction waste, a contract is concluded between the project owner and an alternative excavation, construction and demolition waste management company, based on the Waste Management Plan drawn up by the engineer. At the end of the work, the owner receives from the company the Receipt Certificate which certifies the correct waste management procedure.