diff --git a/errors.go b/errors.go
index dc8386035..7b3d9ec11 100644
--- a/errors.go
+++ b/errors.go
@@ -5,27 +5,97 @@ import (
 	"reflect"
 )
 
-type errMaxQueryPaymentExceeded struct {
+type ErrMaxQueryPaymentExceeded struct {
 	// The cost of the query that was attempted as returned by QueryBuilder.Cost
 	QueryCost Hbar
 	// The limit for a single automatic query payment, set by
-	// Client.SetMaxQueryPayment(tinyBars int64) or QueryBuilder.SetMaxQueryPayment(maxPayment uint64).
+	// Client.SetMaxQueryPayment(int64) or QueryBuilder.SetMaxQueryPayment(uint64).
 	MaxQueryPayment Hbar
 	// Name of the query builder class used for output
 	query string
 }
 
-func newErrorMaxQueryPaymentExceeded(builder *QueryBuilder, queryCost int64, maxQueryPayment int64) errMaxQueryPaymentExceeded {
-	return errMaxQueryPaymentExceeded{
+func newErrorMaxQueryPaymentExceeded(builder *QueryBuilder, queryCost int64, maxQueryPayment int64) ErrMaxQueryPaymentExceeded {
+	return ErrMaxQueryPaymentExceeded{
 		QueryCost:       HbarFromTinybar(queryCost),
 		MaxQueryPayment: HbarFromTinybar(maxQueryPayment),
 		query:           reflect.TypeOf(*builder).Name(),
 	}
 }
 
-func (e errMaxQueryPaymentExceeded) Error() string {
+func (e ErrMaxQueryPaymentExceeded) Error() string {
 	return fmt.Sprintf("cost of %s (%d) without explicit payment is greater than Client.MaxQueryPayment (%d)",
 		e.query,
 		e.QueryCost.tinybar,
 		e.MaxQueryPayment.tinybar)
 }
+
+type ErrBadKey struct {
+	error error
+}
+
+func newErrBadKey(e error) ErrBadKey {
+	return ErrBadKey{
+		error: e,
+	}
+}
+
+func (e ErrBadKey) Error() string {
+	return e.error.Error()
+}
+
+type ErrHederaNetwork struct {
+	error error
+}
+
+func newErrHederaNetwork(e error) ErrHederaNetwork {
+	return ErrHederaNetwork{error: e}
+}
+
+func (e ErrHederaNetwork) Error() string {
+	return fmt.Sprintf("transport error occurred while accessing the Hedera network: %s", e.Error())
+}
+
+type ErrHederaStatus struct {
+	Status Status
+}
+
+func newErrHederaStatus(status Status) ErrHederaStatus {
+	// note [2020-01-15]: in the Java sdk the constructor of HederaStatusException checks if the status code is actually
+	// exceptional and throws an invalid argument exception
+
+	return ErrHederaStatus{
+		Status: status,
+	}
+}
+
+func (e ErrHederaStatus) Error() string {
+	return e.Status.String()
+}
+
+// ErrHbarRange is returned by constructor/factor methods of Hbar when a value is out of range.
+type ErrHbarRange struct {
+	message string
+}
+
+func newErrHbarRange(message string) ErrHbarRange {
+	return ErrHbarRange{message}
+}
+
+func (e ErrHbarRange) Error() string {
+	return e.message
+}
+
+// ErrLocalValidation is returned by TransactionBuilder.Build(*Client) and QueryBuilder.Execute(*Client)
+// if the constructed transaction or query fails local sanity checks.
+type ErrLocalValidation struct {
+	message string
+}
+
+func newErrLocalValidation(message string) ErrLocalValidation {
+	return ErrLocalValidation{message}
+}
+
+func (e ErrLocalValidation) Error() string {
+	return e.message
+}